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Boccaccio A. A mechano-regulation model to design and optimize the surface microgeometry of titanium textured devices for biomedical applications. J Mech Behav Biomed Mater 2024; 157:106645. [PMID: 38963999 DOI: 10.1016/j.jmbbm.2024.106645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 06/20/2024] [Accepted: 06/29/2024] [Indexed: 07/06/2024]
Abstract
In a technological context where, thanks to the additive manufacturing techniques, even sophisticated geometries as well as surfaces with specific micrometric features can be realized, we propose a mechano-regulation algorithm to determine the optimal microgeometric parameters of the surface of textured titanium devices for biomedical applications. A poroelastic finite element model was developed including a portion of bone, a portion of a textured titanium device and a layer of granulation tissue separating the bone from the device and occupying the space between them. The algorithm, implemented in the Matlab environment, determines the optimal values of the root mean square and the correlation length that the device surface must possess to maximize bone formation in the gap between the bone and the device. For low levels of compression load acting on the bone, the algorithm predicts low values of root mean square and high values of correlation length. Conversely, high levels of load require high values of root mean square and low values of correlation length. The optimal microgeometrical parameters were determined for various thickness values of the granulation tissue layer. Interestingly, the predictions of the proposed computational model are consistent with the experimental results reported in the literature. The proposed algorithm shows promise as a valuable tool for addressing the demands of precision medicine. In this approach, the device or prosthesis is no longer designed solely based on statistical averages but is tailored to each patient's unique anthropometric characteristics, as well as considerations related to their metabolism, sex, age, and more.
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Affiliation(s)
- Antonio Boccaccio
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari, Italy.
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Mafra IJ, Bordin D, Siroma RS, Moraschini V, Faverani LP, Souza JG, Mourão CF, Shibli JA. Additive Manufacturing Titanium Dental Implants Placed in Sinuses Grafted with 70HA:30-TCP: A One-Year Retrospective Study for Evaluation of Survival Rate. Dent J (Basel) 2024; 12:181. [PMID: 38920882 PMCID: PMC11202463 DOI: 10.3390/dj12060181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 05/27/2024] [Accepted: 06/04/2024] [Indexed: 06/27/2024] Open
Abstract
The present short-term retrospective study evaluated the implant survival rate and peri-implant bone loss around additive-manufactured titanium implants placed in sinuses grafted with Plenum Osshp (Plenum Bioengenharia, Jundia, SP, Brazil) (70HA:30β-TCP) material. A total of 39 implants were inserted after 23 sinus floor elevation procedures in 16 consecutive patients. Prosthetic rehabilitation included fixed partial prostheses (three units), single crowns (eleven units), and fixed full arches (three units). Clinical and radiographic parameters of implant-supported restorations were evaluated after at least one year of occlusal loading. The implant-crown success criteria included the absence of pain, suppuration, and clinical mobility, an average distance between the implant shoulder and the first visible bone contact (DIB) < 1.0 mm from the initial surgery, and the absence of prosthetic complications at the implant-abutment interface. The overall cumulative implant survival rate was 97.43%. No prosthetic complications at the implant-abutment interface were reported. After one year, the mean DIB was 0.23 mm ± 0.14. Within the limits of this retrospective study, it can be concluded that 70 HA:30 β-TCP allowed stable and reliable bone support to maintain healthy conditions around titanium dental implants produced by additive manufacturing.
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Affiliation(s)
- Ilton José Mafra
- Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos 07023-070, SP, Brazil; (I.J.M.); (D.B.); (R.S.S.); (J.G.S.)
| | - Dimorvan Bordin
- Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos 07023-070, SP, Brazil; (I.J.M.); (D.B.); (R.S.S.); (J.G.S.)
| | - Rafael S. Siroma
- Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos 07023-070, SP, Brazil; (I.J.M.); (D.B.); (R.S.S.); (J.G.S.)
| | - Vittorio Moraschini
- Department of Periodontology, Dental Research Division, School of Dentistry, Veiga de Almeida University, Rua Ibituruna, 108, Maracanã, Rio de Janeiro 20271-020, RJ, Brazil;
| | - Leonardo P. Faverani
- Department of Diagnosis and Surgery, Division of Oral and Maxillofacial Surgery and Implantology, School of Dentistry, São Paulo State University (UNESP), R. José Bonifácio, 1193—V. Mendonca, Araçatuba 16015-050, SP, Brazil;
| | - João Gabriel Souza
- Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos 07023-070, SP, Brazil; (I.J.M.); (D.B.); (R.S.S.); (J.G.S.)
| | - Carlos Fernando Mourão
- Department of Periodontology, Tufts University School of Dental Medicine, Boston, MA 02111, USA
| | - Jamil Awad Shibli
- Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos 07023-070, SP, Brazil; (I.J.M.); (D.B.); (R.S.S.); (J.G.S.)
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Liang H, Chen B, Duan S, Yang L, Xu R, Zhang H, Sun M, Zhou X, Liu H, Wen H, Cai Z. Treatment of complex limb fractures with 3D printing technology combined with personalized plates: a retrospective study of case series and literature review. Front Surg 2024; 11:1383401. [PMID: 38817945 PMCID: PMC11137251 DOI: 10.3389/fsurg.2024.1383401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 05/09/2024] [Indexed: 06/01/2024] Open
Abstract
Background In recent years, 3D printing technology has made significant strides in the medical field. With the advancement of orthopedics, there is an increasing pursuit of high surgical quality and optimal functional recovery. 3D printing enables the creation of precise physical models of fractures, and customized personalized steel plates can better realign and more comprehensively and securely fix fractures. These technologies improve preoperative diagnosis, simulation, and planning for complex limb fractures, providing patients with better treatment options. Patients and methods Five typical cases were selected from a pool of numerous patients treated with 3D printing technology combined with personalized custom steel plates at our hospital. These cases were chosen to demonstrate the entire process of printing 3D models and customizing individualized steel plates, including details of the patients' surgeries and treatment procedures. Literature reviews were conducted, with a focus on highlighting the application of 3D printing technology combined with personalized custom steel plates in the treatment of complex limb fractures. Results 3D printing technology can produce accurate physical models of fractures, and personalized custom plates can achieve better fracture realignment and more comprehensive and robust fixation. These technologies provide patients with better treatment options. Conclusion The use of 3D printing models and personalized custom steel plates can improve preoperative diagnosis, simulation, and planning for complex limb fractures, realizing personalized medicine. This approach helps reduce surgical time, minimize trauma, enhance treatment outcomes, and improve patient functional recovery.
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Affiliation(s)
- Hairui Liang
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Beibei Chen
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Siyu Duan
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Lei Yang
- School of Pharmacy, Inner Mongolia Medical University, Inner Mongolia Autonomous Region, Shenyang, China
| | - Rongda Xu
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - He Zhang
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Ming Sun
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Xueting Zhou
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Hanfei Liu
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Hang Wen
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
| | - Zhencun Cai
- Department of Orthopedics Surgery, Central Hospital Affiliated to Shenyang Medical College, Shenyang, Liaoning, China
- Key Laboratory of Human Ethnic Specificity and Phenomics of Critical Illness in Liaoning Province, Shenyang Medical College, Shenyang, China
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Zhou L, Miller J, Vezza J, Mayster M, Raffay M, Justice Q, Al Tamimi Z, Hansotte G, Sunkara LD, Bernat J. Additive Manufacturing: A Comprehensive Review. SENSORS (BASEL, SWITZERLAND) 2024; 24:2668. [PMID: 38732776 PMCID: PMC11085389 DOI: 10.3390/s24092668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/19/2024] [Accepted: 04/20/2024] [Indexed: 05/13/2024]
Abstract
Additive manufacturing has revolutionized manufacturing across a spectrum of industries by enabling the production of complex geometries with unparalleled customization and reduced waste. Beginning as a rapid prototyping tool, additive manufacturing has matured into a comprehensive manufacturing solution, embracing a wide range of materials, such as polymers, metals, ceramics, and composites. This paper delves into the workflow of additive manufacturing, encompassing design, modeling, slicing, printing, and post-processing. Various additive manufacturing technologies are explored, including material extrusion, VAT polymerization, material jetting, binder jetting, selective laser sintering, selective laser melting, direct metal laser sintering, electron beam melting, multi-jet fusion, direct energy deposition, carbon fiber reinforced, laminated object manufacturing, and more, discussing their principles, advantages, disadvantages, material compatibilities, applications, and developing trends. Additionally, the future of additive manufacturing is projected, highlighting potential advancements in 3D bioprinting, 3D food printing, large-scale 3D printing, 4D printing, and AI-based additive manufacturing. This comprehensive survey aims to underscore the transformative impact of additive manufacturing on global manufacturing, emphasizing ongoing challenges and the promising horizon of innovations that could further elevate its role in the manufacturing revolution.
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Affiliation(s)
- Longfei Zhou
- Department of Biomedical, Industrial and Systems Engineering, School of Engineering and Computing, College of Engineering and Business, Gannon University, Erie, PA 16541, USA
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Kouhi M, de Souza Araújo IJ, Asa'ad F, Zeenat L, Bojedla SSR, Pati F, Zolfagharian A, Watts DC, Bottino MC, Bodaghi M. Recent advances in additive manufacturing of patient-specific devices for dental and maxillofacial rehabilitation. Dent Mater 2024; 40:700-715. [PMID: 38401992 DOI: 10.1016/j.dental.2024.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 02/26/2024]
Abstract
OBJECTIVES Customization and the production of patient-specific devices, tailoring the unique anatomy of each patient's jaw and facial structures, are the new frontiers in dentistry and maxillofacial surgery. As a technological advancement, additive manufacturing has been applied to produce customized objects based on 3D computerized models. Therefore, this paper presents advances in additive manufacturing strategies for patient-specific devices in diverse dental specialties. METHODS This paper overviews current 3D printing techniques to fabricate dental and maxillofacial devices. Then, the most recent literature (2018-2023) available in scientific databases reporting advances in 3D-printed patient-specific devices for dental and maxillofacial applications is critically discussed, focusing on the major outcomes, material-related details, and potential clinical advantages. RESULTS The recent application of 3D-printed customized devices in oral prosthodontics, implantology and maxillofacial surgery, periodontics, orthodontics, and endodontics are presented. Moreover, the potential application of 4D printing as an advanced manufacturing technology and the challenges and future perspectives for additive manufacturing in the dental and maxillofacial area are reported. SIGNIFICANCE Additive manufacturing techniques have been designed to benefit several areas of dentistry, and the technologies, materials, and devices continue to be optimized. Image-based and accurately printed patient-specific devices to replace, repair, and regenerate dental and maxillofacial structures hold significant potential to maximize the standard of care in dentistry.
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Affiliation(s)
- Monireh Kouhi
- Dental Materials Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
| | - Isaac J de Souza Araújo
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor, MI, United States
| | - Farah Asa'ad
- Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Department of Oral Biochemistry, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Lubna Zeenat
- School of Engineering, Deakin University, Geelong 3216, Australia; Department of Biomedical Engineering, IIT Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Sri Sai Ramya Bojedla
- Department of Biomedical Engineering, IIT Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Falguni Pati
- Department of Biomedical Engineering, IIT Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Ali Zolfagharian
- School of Engineering, Deakin University, Geelong 3216, Australia
| | - David C Watts
- School of Medical Sciences, University of Manchester, Manchester, UK
| | - Marco C Bottino
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor, MI, United States; Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, United States
| | - Mahdi Bodaghi
- Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK.
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Iezzi G, Zavan B, Petrini M, Ferroni L, Pierfelice TV, D'Amora U, Ronca A, D'Amico E, Mangano C. 3D printed dental implants with a porous structure: The in vitro response of osteoblasts, fibroblasts, mesenchymal stem cells, and monocytes. J Dent 2024; 140:104778. [PMID: 37951493 DOI: 10.1016/j.jdent.2023.104778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 11/14/2023] Open
Abstract
AIMS The first aim of this study was to characterize the surface topography of a novel 3D-printed dental implant at the micro- and macro-level. Its second aim was to evaluate the osteogenic, angiogenic, and immunogenic responses of human oral osteoblasts (hOBs), gingival fibroblasts (hGFs), mesenchymal stem cells (hAD-MSCs), and monocytes to this novel implant surface. METHODS A 3D-printed Ti-6Al-4 V implant was produced by selective laser melting and subjected to organic acid etching (TEST). It was then compared to a machined surface (CTRL). Its biological properties were evaluated via cell proliferation assays, morphological observations, gene expression analyses, mineralization assessments, and collagen quantifications. RESULTS Scanning electron microscopy analysis showed that the TEST group was characterized by a highly interconnected porous architecture and a roughed surface. The morphological observations showed good adhesion of cells cultured on the TEST surface, with a significant increase in hOB growth. Similarly, the gene expression analysis showed significantly higher levels of osseointegration biomarkers. Picrosirius staining showed a slight increase in collagen production in the TEST group compared to the CTRL group. hAD-MSCs showed an increase in endothelial and osteogenic commitment-related markers. Monocytes showed increased mRNA synthesis related to the M2 (anti-inflammatory) macrophagic phenotype. CONCLUSIONS Considering the higher interaction with hOBs, hGFs, hAD-MSCs, and monocytes, the prepared 3D-printed implant could be used for future clinical applications. CLINICAL RELEVANCE This study demonstrated the excellent biological response of various cells to the porous surface of the novel 3D-printed implant.
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Affiliation(s)
- Giovanna Iezzi
- Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini, 31, Chieti 66100, Italy
| | - Barbara Zavan
- Translational Medicine Department, University of Ferrara, Ferrara 44121, Italy
| | - Morena Petrini
- Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini, 31, Chieti 66100, Italy
| | - Letizia Ferroni
- Maria Cecilia Hospital, GVM Care & Research, Cotignola, Ravenna 48033, Italy
| | - Tania Vanessa Pierfelice
- Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini, 31, Chieti 66100, Italy
| | - Ugo D'Amora
- Institute of Polymers, Composites and Biomaterials National Research Council (IPCB-CNR), Naples 80125, Italy
| | - Alfredo Ronca
- Institute of Polymers, Composites and Biomaterials National Research Council (IPCB-CNR), Naples 80125, Italy
| | - Emira D'Amico
- Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini, 31, Chieti 66100, Italy.
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Suh H, Lee D, Lee J, Seol YJ, Lee YM, Koo KT. Comparative evaluation of 3D-printed and conventional implants in vivo: a quantitative microcomputed tomographic and histomorphometric analysis. Sci Rep 2023; 13:21041. [PMID: 38030796 PMCID: PMC10687100 DOI: 10.1038/s41598-023-48315-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/24/2023] [Indexed: 12/01/2023] Open
Abstract
In recent years, 3D-printing technology to fabricate dental implants has garnered widespread attention due to its patient-specific customizability and cost-effectiveness. This preclinical animal study analyzed the radiographic and histomorphometric outcomes of 3D-printed implants (3DIs) placed immediately after extraction and compared them to conventional implants (CIs). 3DIs and CIs of the same dimensions placed immediately were analyzed at 2, 6, and 12 weeks. The micro-computed tomography (micro-CT) analysis revealed statistically significant differences at 2 weeks in favor of 3DIs over the CIs in terms of bone volume/tissue volume (BV/TV), bone surface/bone volume (BS/BV), trabecular bone pattern factor (Tb.Pf), and structure model index (SMI). At 2 weeks, the mean bone-to-implant contact (BIC) of the 3DIs was greater than that of the CIs; the mean bone area fraction occupancy (BAFO) and the number of Haversian canals of the 3DIs showed no statistically significant differences compared to CIs at 2 weeks. At 6 and 12 weeks, there were no statistically significant differences between the 3DIs and CIs in any parameters. Within limitations, in the early stage of extraction socket healing, the 3DIs demonstrated a higher BIC than the CIs, presenting that 3DIs may be a potential option for immediate placement to enhance osseointegration.
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Affiliation(s)
- Hyemee Suh
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
- Department of Periodontology, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea
| | - Dongseob Lee
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
- National Dental Care Center for Persons with Special Needs, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea
| | - Jungwon Lee
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
- One-Stop Specialty Center, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea.
| | - Yang-Jo Seol
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
- Department of Periodontology, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea
| | - Yong-Moo Lee
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
- Department of Periodontology, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea
| | - Ki-Tae Koo
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
- Department of Periodontology, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea.
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Magill E, Demartis S, Gavini E, Permana AD, Thakur RRS, Adrianto MF, Waite D, Glover K, Picco CJ, Korelidou A, Detamornrat U, Vora LK, Li L, Anjani QK, Donnelly RF, Domínguez-Robles J, Larrañeta E. Solid implantable devices for sustained drug delivery. Adv Drug Deliv Rev 2023; 199:114950. [PMID: 37295560 DOI: 10.1016/j.addr.2023.114950] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 06/02/2023] [Accepted: 06/04/2023] [Indexed: 06/12/2023]
Abstract
Implantable drug delivery systems (IDDS) are an attractive alternative to conventional drug administration routes. Oral and injectable drug administration are the most common routes for drug delivery providing peaks of drug concentrations in blood after administration followed by concentration decay after a few hours. Therefore, constant drug administration is required to keep drug levels within the therapeutic window of the drug. Moreover, oral drug delivery presents alternative challenges due to drug degradation within the gastrointestinal tract or first pass metabolism. IDDS can be used to provide sustained drug delivery for prolonged periods of time. The use of this type of systems is especially interesting for the treatment of chronic conditions where patient adherence to conventional treatments can be challenging. These systems are normally used for systemic drug delivery. However, IDDS can be used for localised administration to maximise the amount of drug delivered within the active site while reducing systemic exposure. This review will cover current applications of IDDS focusing on the materials used to prepare this type of systems and the main therapeutic areas of application.
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Affiliation(s)
- Elizabeth Magill
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Sara Demartis
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Sassari, 07100, Italy
| | - Elisabetta Gavini
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Sassari, 07100, Italy
| | - Andi Dian Permana
- Department of Pharmaceutics, Faculty of Pharmacy, Universitas Hasanuddin, Makassar 90245, Indonesia
| | - Raghu Raj Singh Thakur
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK; Re-Vana Therapeutics, McClay Research Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Muhammad Faris Adrianto
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK; Re-Vana Therapeutics, McClay Research Centre, 97 Lisburn Road, Belfast BT9 7BL, UK; Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Airlangga University, Surabaya, East Java 60115, Indonesia
| | - David Waite
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK; Re-Vana Therapeutics, McClay Research Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Katie Glover
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Camila J Picco
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Anna Korelidou
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Usanee Detamornrat
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Lalitkumar K Vora
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Linlin Li
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Qonita Kurnia Anjani
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK; Fakultas Farmasi, Universitas Megarezky, Jl. Antang Raya No. 43, Makassar 90234, Indonesia
| | - Ryan F Donnelly
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK
| | - Juan Domínguez-Robles
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK; Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, Universidad de Sevilla, 41012 Seville, Spain.
| | - Eneko Larrañeta
- School of Pharmacy, Queen's University Belfast, 97, Lisburn Road, Belfast BT9 7BL, UK.
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Matsko A, Shaker N, Fernandes ACBCJ, Haimeur A, França R. Nanoscale Chemical Surface Analyses of Recycled Powder for Direct Metal Powder Bed Fusion Ti-6Al-4V Root Analog Dental Implant: An X-ray Photoelectron Spectroscopy Study. Bioengineering (Basel) 2023; 10:bioengineering10030379. [PMID: 36978770 PMCID: PMC10045388 DOI: 10.3390/bioengineering10030379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
Over the past couple of decades, additive manufacturing and the use of root-analogue-printed titanium dental implants have been developed. Not all powder particles are sintered into the final product during the additive manufacturing process. Reuse of the remaining powder could reduce the overall implant manufacturing cost. However, Ti-6Al-4V powder particles are affected by heat, mechanical factors, and oxidization during the powder bed fusion manufacturing process. Degradation of the powder may harm the final surface composition and decrease the biocompatibility and survival of the implant. The uncertainty of the recycled powder properties prevents implant fabrication facilities from reusing the powder. This study investigates the chemical composition of controlled, clean, and recycled titanium alloy powder and root-analogue implants (RAI) manufactured from these powders at three different depths. The change in titanium's quantity, oxidization state, and chemical composition in powder and RAI implants have been demonstrated and analyzed. While not identical, the surface chemical composition of the recycled powder implant and the implant manufactured from unused powder are similar. The results also indicate the presence of TiO2 on all surfaces. Many studies confirmed that titanium dioxide on the implant's surface correlates with better osteointegration, reduced bacterial infection, and increased corrosion resistance. Considering economic and environmental aspects, surface chemical composition comparison of clean and reused powder is crucial for the future manufacturing of cost-effective and biocompatible implants.
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Affiliation(s)
- Anastasia Matsko
- Biomedical Engineering Program, Faculty of Engineering University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Nader Shaker
- Department of Restorative Dentistry, College of Dentistry, University of Manitoba, Winnipeg, MB R3E 0W2, Canada
| | - Ana Carla B C J Fernandes
- Department of Oral Biology, College of Dentistry, University of Manitoba, Winnipeg, MB R3E 0W2, Canada
| | - Asmaa Haimeur
- Department of Restorative Dentistry, College of Dentistry, University of Manitoba, Winnipeg, MB R3E 0W2, Canada
| | - Rodrigo França
- Department of Restorative Dentistry, College of Dentistry, University of Manitoba, Winnipeg, MB R3E 0W2, Canada
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Pattnaik A, Sanket AS, Pradhan S, Sahoo R, Das S, Pany S, Douglas TEL, Dandela R, Liu Q, Rajadas J, Pati S, De Smedt SC, Braeckmans K, Samal SK. Designing of gradient scaffolds and their applications in tissue regeneration. Biomaterials 2023; 296:122078. [PMID: 36921442 DOI: 10.1016/j.biomaterials.2023.122078] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 02/19/2023] [Accepted: 03/02/2023] [Indexed: 03/07/2023]
Abstract
Gradient scaffolds are isotropic/anisotropic three-dimensional structures with gradual transitions in geometry, density, porosity, stiffness, etc., that mimic the biological extracellular matrix. The gradient structures in biological tissues play a major role in various functional and metabolic activities in the body. The designing of gradients in the scaffold can overcome the current challenges in the clinic compared to conventional scaffolds by exhibiting excellent penetration capacity for nutrients & cells, increased cellular adhesion, cell viability & differentiation, improved mechanical stability, and biocompatibility. In this review, the recent advancements in designing gradient scaffolds with desired biomimetic properties, and their implication in tissue regeneration applications have been briefly explained. Furthermore, the gradients in native tissues such as bone, cartilage, neuron, cardiovascular, skin and their specific utility in tissue regeneration have been discussed in detail. The insights from such advances using gradient-based scaffolds can widen the horizon for using gradient biomaterials in tissue regeneration applications.
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Affiliation(s)
- Ananya Pattnaik
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - A Swaroop Sanket
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - Sanghamitra Pradhan
- Department of Chemistry, Institute of Technical Education and Research, Siksha 'O' Anusandhan University, Bhubaneswar, 751030, Odisha, India
| | - Rajashree Sahoo
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - Sudiptee Das
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - Swarnaprbha Pany
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - Timothy E L Douglas
- Engineering Department, Lancaster University, Lancaster, United Kingdom; Materials Science Institute, Lancaster University, Lancaster, United Kingdom
| | - Rambabu Dandela
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology, Indian Oil Odisha Campus, Bhubaneswar, Odisha, India
| | - Qiang Liu
- Advanced Drug Delivery and Regenerative Biomaterials Laboratory, Cardiovascular Institute, Stanford University School of Medicine, Department of Medicine, Stanford University, California, 94304, USA
| | - Jaykumar Rajadas
- Advanced Drug Delivery and Regenerative Biomaterials Laboratory, Cardiovascular Institute, Stanford University School of Medicine, Department of Medicine, Stanford University, California, 94304, USA; Department of Bioengineering and Therapeutic Sciences, University of California San Francusco (UCSF) School of Parmacy, California, USA
| | - Sanghamitra Pati
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India
| | - Stefaan C De Smedt
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium.
| | - Kevin Braeckmans
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
| | - Sangram Keshari Samal
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies, ICMR-Regional Medical Research Centre, Bhubaneswar, 751023, Odisha, India.
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11
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Abuabiah M, Mbodj NG, Shaqour B, Herzallah L, Juaidi A, Abdallah R, Plapper P. Advancements in Laser Wire-Feed Metal Additive Manufacturing: A Brief Review. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2030. [PMID: 36903145 PMCID: PMC10004454 DOI: 10.3390/ma16052030] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 02/21/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Laser Wire-Feed Metal Additive Manufacturing (LWAM) is a process that utilizes a laser to heat and melt a metallic alloy wire, which is then precisely positioned on a substrate, or previous layer, to build a three-dimensional metal part. LWAM technology offers several advantages, such as high speed, cost effectiveness, precision control, and the ability to create complex geometries with near-net shape features and improved metallurgical properties. However, the technology is still in its early stages of development, and its integration into the industry is ongoing. To provide a comprehensive understanding of the LWAM technology, this review article emphasizes the importance of key aspects of LWAM, including parametric modeling, monitoring systems, control algorithms, and path-planning approaches. The study aims to identify potential gaps in the existing literature and highlight future research opportunities in the field of LWAM, with the goal of advancing its industrial application.
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Affiliation(s)
- Mohammad Abuabiah
- Mechanical and Mechatronics Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus P.O. Box 7, Palestine
- Department of Engineering, University of Luxembourg, 6, Rue-Kalergi, L-1359 Luxembourg, Luxembourg
| | - Natago Guilé Mbodj
- Department of Engineering, University of Luxembourg, 6, Rue-Kalergi, L-1359 Luxembourg, Luxembourg
| | - Bahaa Shaqour
- Mechanical and Mechatronics Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus P.O. Box 7, Palestine
| | - Luqman Herzallah
- Mechanical and Mechatronics Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus P.O. Box 7, Palestine
| | - Adel Juaidi
- Mechanical and Mechatronics Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus P.O. Box 7, Palestine
| | - Ramez Abdallah
- Mechanical and Mechatronics Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus P.O. Box 7, Palestine
| | - Peter Plapper
- Department of Engineering, University of Luxembourg, 6, Rue-Kalergi, L-1359 Luxembourg, Luxembourg
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12
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Huang S, Wei H, Li D. Additive manufacturing technologies in the oral implant clinic: A review of current applications and progress. Front Bioeng Biotechnol 2023; 11:1100155. [PMID: 36741746 PMCID: PMC9895117 DOI: 10.3389/fbioe.2023.1100155] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/11/2023] [Indexed: 01/21/2023] Open
Abstract
Additive manufacturing (AM) technologies can enable the direct fabrication of customized physical objects with complex shapes, based on computer-aided design models. This technology is changing the digital manufacturing industry and has become a subject of considerable interest in digital implant dentistry. Personalized dentistry implant treatments for individual patients can be achieved through Additive manufacturing. Herein, we review the applications of Additive manufacturing technologies in oral implantology, including implant surgery, and implant and restoration products, such as surgical guides for implantation, custom titanium meshes for bone augmentation, personalized or non-personalized dental implants, custom trays, implant casts, and implant-support frameworks, among others. In addition, this review also focuses on Additive manufacturing technologies commonly used in oral implantology. Stereolithography, digital light processing, and fused deposition modeling are often used to construct surgical guides and implant casts, whereas direct metal laser sintering, selective laser melting, and electron beam melting can be applied to fabricate dental implants, personalized titanium meshes, and denture frameworks. Moreover, it is sometimes required to combine Additive manufacturing technology with milling and other cutting and finishing techniques to ensure that the product is suitable for its final application.
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Affiliation(s)
| | - Hongbo Wei
- *Correspondence: Hongbo Wei, ; Dehua Li,
| | - Dehua Li
- *Correspondence: Hongbo Wei, ; Dehua Li,
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13
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Hossain M, Im S, Jeong JH, Sultana T, Kang JH, Lee BT. Efficacy of a newly designed helical-shaped 3D-printed titanium cage for cervical vertebral defect healing in rabbits. Am J Transl Res 2023; 15:114-124. [PMID: 36777855 PMCID: PMC9908481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 12/13/2022] [Indexed: 02/14/2023]
Abstract
Three-dimensional (3D) printed titanium (Ti-6Al-4V alloy) cages are widely used for spinal fusion applications. However, the structural design and shape of the cages are a major determinant of the optimal clinical outcome. In this study, we constructed a newly designed 3D-printed helical-shaped titanium cage (HTC) with a flexible body, and compared its healing and fusion efficacy in cervical vertebral defects after corpectomy in rabbits to that of a 3D-printed traditional titanium cage (TTC). We performed radiological examinations 1 and 16 weeks after TTC and HTC implantation. We assessed bone ingrowth in TTC and HTC using micro-computed tomography (micro-CT) and histological staining of tissue sections at 16 weeks. The radiographic data showed that the HTC-implanted group had better restoration of vertebral height than the TTC group, indicating a lower risk of cage subsidence. The micro-CT and histological observations showed that HTC promoted bone regeneration and osseointegration more effectively than TTC. Histomorphometry further revealed significant new bone formation in the HTC group compared to the TTC group. These findings demonstrate that HTC has better healing and bone fusion effects than TTC in cervical vertebral defects in rabbits, indicating its potential clinical value.
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Affiliation(s)
- Mosharraf Hossain
- Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon HospitalBucheon, South Korea
| | - Soobin Im
- Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon HospitalBucheon, South Korea,Institute of Tissue Regeneration, Soonchunhyang UniversityCheonan, South Korea
| | - Je Hoon Jeong
- Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon HospitalBucheon, South Korea
| | - Tamima Sultana
- Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon HospitalBucheon, South Korea
| | - Jung Hoon Kang
- Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon HospitalBucheon, South Korea
| | - Byong-Taek Lee
- Institute of Tissue Regeneration, Soonchunhyang UniversityCheonan, South Korea,Department of Regenerative Medicine, Soonchunhyang UniversityCheonan, South Korea
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14
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Strappa EM, Memè L, Cerea M, Roy M, Bambini F. Custom-made additively manufactured subperiosteal implant. Minerva Dent Oral Sci 2022; 71:353-360. [PMID: 36345834 DOI: 10.23736/s2724-6329.22.04640-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Subperiosteal implants were introduced in the last century. Poor clinical results led those implants to be progressively abandoned. Recently, several Authors suggested a revival of subperiosteal implants as an alternative to regenerative procedures. The purpose of this study was to describe the clinical application of custom-made additively manufactured subperiosteal implant for fixed prosthetic rehabilitation of edentulous maxilla. Plaster models of the upper and the lower arch were scanned, as well as the mock-up. Digital Imaging and Communications in Medicine data obtained from cone beam computed tomography were processed through the thresholding procedure. The design of the subperiosteal implant was drawn on the stereolithographic model and scanned. Once the digital project of the subperiosteal implant was completed, it was sent to additive manufacturing. After the surgery, the patient was strictly monitored for up to 2 years. The outcomes were assessed based on the incurrence of biological and mechanical complications, postoperative complications, and implant survival. The patient did not suffer from postoperative complications. Neither biological nor mechanical complications occurred during the follow-up period. At the end of the study, the implant was still in function. Custom-made subperiosteal implants could be considered as an alternative to regenerative procedures for the rehabilitation of severe bone atrophy. Further studies are needed in the future to confirm the positive outcome.
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Affiliation(s)
| | - Lucia Memè
- Department of Clinical Sciences and Stomatology, Marche Polytechnic University, Ancona, Italy
| | | | - Marco Roy
- Department of Prosthodontics, Poznań University of Medical Sciences, Poznań, Poland
| | - Fabrizio Bambini
- Department of Clinical Sciences and Stomatology, Marche Polytechnic University, Ancona, Italy
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15
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Custom-Made Direct Metal Laser Sintering Titanium Subperiosteal Implants in Oral and Maxillofacial Surgery for Severe Bone-Deficient Patients—A Pilot Study. Diagnostics (Basel) 2022; 12:diagnostics12102531. [PMID: 36292220 PMCID: PMC9601393 DOI: 10.3390/diagnostics12102531] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/09/2022] [Accepted: 10/12/2022] [Indexed: 11/26/2022] Open
Abstract
Background: Nowadays, a combination of classical subperiosteal implant designs with 3D imaging and printing allows one to reduce treatment time and provides support for fixed prostheses in cases where other techniques do not provide satisfactory results. This study aims to present a digital technique for the manufacturing of custom-made subperiosteal implants and what complications might appear after this type of surgery. Methods: Sixteen patients treated with a custom-made DMLS titanium subperiosteal implant during the period between October 2021 and February 2022 were enrolled in the study. Orthopantomography (OPT) and cone-beam computer tomography (CBCT) were recorded for all patients. The measurements taken into account in this study were the fit and stability of implants, duration of surgery, implant survival, and early and late complications. Results: The fit of the implants was extremely satisfactory, with a mean rating of 4 out of 5. The mean duration of the intervention was 86.18 min. At the end of the study, one implant was lost due to insufficient fit and recurrent, untreatable infections. Eleven implants (69%) were placed on the maxillary and five (31%) implants were placed on the mandible. Conclusions: Taking this into consideration, custom-made DMLS titanium subperiosteal implants could present satisfactory implant survival and low complication rates.
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Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants. JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING 2022. [DOI: 10.3390/jmmp6030065] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nickel–titanium (NiTi) is a shape-memory alloy, a type of material whose name is derived from its ability to recover its original shape upon heating to a certain temperature. NiTi falls under the umbrella of metallic materials, offering high superelasticity, acceptable corrosion resistance, a relatively low elastic modulus, and desirable biocompatibility. There are several challenges regarding the processing and machinability of NiTi, originating from its high ductility and reactivity. Additive manufacturing (AM), commonly known as 3D printing, is a promising candidate for solving problems in the fabrication of near-net-shape NiTi biomaterials with controlled porosity. Powder-bed fusion and directed energy deposition are AM approaches employed to produce synthetic NiTi implants. A short summary of the principles and the pros and cons of these approaches is provided. The influence of the operating parameters, which can change the microstructural features, including the porosity content and orientation of the crystals, on the mechanical properties is addressed. Surface-modification techniques are recommended for suppressing the Ni ion leaching from the surface of AM-fabricated NiTi, which is a technical challenge faced by the long-term in vivo application of NiTi.
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17
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Figliuzzi MM, Aiello D, Rengo C, Parentela L, Mangano C. 10-Year Evaluation of the First Root Analogue Implant on Humans, Made Using a CT Scan, CAD/CAM and DMLS. Biomimetics (Basel) 2022; 7:biomimetics7010032. [PMID: 35323189 PMCID: PMC8945815 DOI: 10.3390/biomimetics7010032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/02/2022] [Accepted: 03/07/2022] [Indexed: 01/27/2023] Open
Abstract
Ten years ago, for the first time in humans, thanks to the DLMS (direct metal laser sintering) technique, we designed, built and inserted an immediate post-extraction custom-made root-analogue implant in Ti-6Al-4v with platform switching. The implant was inserted into the post-extraction socket, respecting the biological width. After 10 years, we wanted to evaluate the dimensional stability of the implant and the eventual crestal bone resorption. The evaluation was performed clinically with periodontal parameters and radiographically by means of an intraoral X-ray with the parallel technique measuring the distance between the base of the bone crest and the implant shoulder. It appears that the implant has maintained dimensional stability of the peri-implant soft tissues, and the crestal resorption is 0 mm. This could represent a step forward to make this experimental method a valid alternative to the current immediate post-extraction implant procedures in use.
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Affiliation(s)
- Michele Mario Figliuzzi
- Department of Health and Oral Sciences Periodontology Clinic, Medicine and Surgery School, “Magna Graecia” University of Catanzaro, 88100 Catanzaro, Italy; (D.A.); (L.P.)
- Correspondence:
| | - Domenico Aiello
- Department of Health and Oral Sciences Periodontology Clinic, Medicine and Surgery School, “Magna Graecia” University of Catanzaro, 88100 Catanzaro, Italy; (D.A.); (L.P.)
| | - Carlo Rengo
- Dental School of Periodonotogy, University of Naples “Federico II”, 80127 Napoli, Italy;
| | - Luca Parentela
- Department of Health and Oral Sciences Periodontology Clinic, Medicine and Surgery School, “Magna Graecia” University of Catanzaro, 88100 Catanzaro, Italy; (D.A.); (L.P.)
| | - Carlo Mangano
- Department of Medicine and Surgery, Dental School, University of Varese, 21100 Varese, Italy;
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18
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Numerical Simulation of High Strain Rate and Temperature Properties of Laser Powder Bed Fusion Ti6Al4V(ELI) Determined Using a Split Hopkinson Pressure Bar. MATERIALS 2022; 15:ma15051872. [PMID: 35269102 PMCID: PMC8911580 DOI: 10.3390/ma15051872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 02/17/2022] [Accepted: 02/24/2022] [Indexed: 01/27/2023]
Abstract
Numerical models can be useful for analysis of the ability of structural engineering materials to withstand harsh environmental conditions such as dynamic loading. In the present study, a microstructure-variable-based numerical model for predicting the high strain rate and temperature properties of different microstructures of Ti6Al4V (ELI-Extra Low Interstitial) produced by laser-based powder bed fusion is proposed. The model was implemented in two different subroutines, VUMAT and VUHARD, available in ABAQUS/Explicit for simulating dynamic conditions. The two subroutines were then used to simulate the split Hopkinson pressure bar (SHPB) experiments to study the flow properties of various forms of the direct metal laser sintered Ti6Al4V(ELI) alloy at various conditions of strain rate and temperature. Comparison of the results obtained through simulation and those obtained from experimental testing showed high degrees of correlation and accuracy with correlation coefficients and absolute percentage errors >0.97 and <4%, respectively. The numerical model was also shown to give good predictions of the strain hardening and dynamic recovery phenomena that prevail for deformations at high strain rates and temperatures.
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19
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Lee J, Li L, Song HY, Son MJ, Lee YM, Koo KT. Impact of lattice versus solid structure of 3D-printed multiroot dental implants using Ti-6Al-4V: a preclinical pilot study. J Periodontal Implant Sci 2022; 52:338-350. [PMID: 36047586 PMCID: PMC9436642 DOI: 10.5051/jpis.2105720286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/28/2021] [Accepted: 01/11/2022] [Indexed: 11/15/2022] Open
Abstract
Purpose Various studies have investigated 3-dimensional (3D)-printed implants using Ti-6Al-4V powder; however, multi-root 3D-printed implants have not been fully investigated. The purpose of this study was to explore the stability of multirooted 3D-printed implants with lattice and solid structures. The secondary outcomes were comparisons between the 2 types of 3D-printed implants in micro-computed tomographic and histological analyses. Methods Lattice- and solid-type 3D-printed implants for the left and right mandibular third premolars in beagle dogs were fabricated. Four implants in each group were placed immediately following tooth extraction. Implant stability measurement and periapical X-rays were performed every 2 weeks for 12 weeks. Peri-implant bone volume/tissue volume (BV/TV) and bone mineral density (BMD) were measured by micro-computed tomography. Bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO) were measured in histomorphometric analyses. Results All 4 lattice-type 3D-printed implants survived. Three solid-type 3D-printed implants were removed before the planned sacrifice date due to implant mobility. A slight, gradual increase in implant stability values from implant surgery to 4 weeks after surgery was observed in the lattice-type 3D-printed implants. The marginal bone change of the surviving solid-type 3D-printed implant was approximately 5 mm, whereas the value was approximately 2 mm in the lattice-type 3D-printed implants. BV/TV and BMD in the lattice type 3D-printed implants were similar to those in the surviving solid-type implant. However, BIC and BAFO were lower in the surviving solid-type 3D-printed implant than in the lattice-type 3D-printed implants. Conclusions Within the limits of this preclinical study, 3D-printed implants of double-rooted teeth showed high primary stability. However, 3D-printed implants with interlocking structures such as lattices might provide high secondary stability and successful osseointegration.
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Affiliation(s)
- Jungwon Lee
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
- One-Stop Specialty Center, Seoul National University Dental Hospital, Seoul, Korea
| | - Ling Li
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Hyun-Young Song
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Min-Jung Son
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Yong-Moo Lee
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Ki-Tae Koo
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
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20
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Karapetyan AA, Ukhanov MM, Ryakhovsky AN. [Metal 3D printing in dentistry]. STOMATOLOGIIA 2022; 101:85-91. [PMID: 36268927 DOI: 10.17116/stomat202210105185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The article describes the use of 3D printing in dentistry, the principle of operation of 3D printers for metals, a review of comparative data on the quality and accuracy of the final product of 3D metal printing is carried out. Possibilities and prospects of using 3D metal printing in dentistry are indicated.
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Affiliation(s)
- A A Karapetyan
- Central Research Institute of Dental and Maxillofacial Surgery, Moscow, Russia
| | - M M Ukhanov
- Central Research Institute of Dental and Maxillofacial Surgery, Moscow, Russia
| | - A N Ryakhovsky
- Central Research Institute of Dental and Maxillofacial Surgery, Moscow, Russia
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21
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The Open Cell Form of 3D-Printed Titanium Improves Osteconductive Properties and Adhesion Behavior of Dental Pulp Stem Cells. MATERIALS 2021; 14:ma14185308. [PMID: 34576532 PMCID: PMC8467079 DOI: 10.3390/ma14185308] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/09/2021] [Accepted: 09/10/2021] [Indexed: 01/01/2023]
Abstract
Titanium specimens have been proven to be safe and effective biomaterials in terms of their osseo-integration. To improve the bioactivity and develop customized implants titanium, the surface can be modified with selective laser melting (SLM). Moreover, the design of macro-porous structures has become popular for reaching a durable bone fixation. 3D-printed titanium (Titanium A, B, and C), were cleaned using an organic acid treatment or with electrochemical polishing, and were characterized in terms of their surface morphology using scanning electron microscopy. Next, Dental Pulp Stem Cells (DPSCs) were cultured on titanium in order to analyze their biocompatibility, cell adhesion, and osteoconductive properties. All tested specimens were biocompatible, due to the time-dependent increase of DPSC proliferation paralleled by the decrease of LDH released. Furthermore, data highlighted that the open cell form with interconnected pores of titanium A, resembling the inner structure of the native bone, allows cells to better adhere inside the specimen, being proteins related to cell adherence highly expressed. Likewise, titanium A displays more suitable osteoconductive properties, being the profile of osteogenic markers improved compared to titanium B and C. The present work has demonstrated that the inner design and post-production treatments on titanium surfaces have a dynamic influence on DPSC behavior toward adhesion and osteogenic commitment.
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22
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Contemporary Approach to the Porosity of Dental Materials and Methods of Its Measurement. Int J Mol Sci 2021; 22:ijms22168903. [PMID: 34445606 PMCID: PMC8396236 DOI: 10.3390/ijms22168903] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/11/2021] [Accepted: 08/15/2021] [Indexed: 01/05/2023] Open
Abstract
Porosity is an important parameter for characterizing the microstructure of solids that corresponds to the volume of the void space, which may contain fluid or air, over the total volume of the material. Many materials of natural and technically manufactured origin have a large number of voids in their internal structure, relatively small in size, compared to the characteristic dimensions of the body itself. Thus, porosity is an important feature of industrial materials, but also of biological ones. The porous structure affects a number of material properties, such as sorption capacity, as well as mechanical, thermal, and electrical properties. Porosity of materials is an important factor in research on biomaterials. The most popular materials used to rebuild damaged tooth tissues are composites and ceramics, whilst titanium alloys are used in the production of implants that replace the tooth root. Research indicates that the most comprehensive approach to examining such materials should involve an analysis using several complementary methods covering the widest possible range of pore sizes. In addition to the constantly observed increase in the resolution capabilities of devices, the development of computational models and algorithms improving the quality of the measurement signal remains a big challenge.
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23
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Benefits and Biosafety of Use of 3D-Printing Technology for Titanium Biomedical Implants: A Pilot Study in the Rabbit Model. Int J Mol Sci 2021; 22:ijms22168480. [PMID: 34445182 PMCID: PMC8395183 DOI: 10.3390/ijms22168480] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/03/2021] [Accepted: 08/04/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Titanium has been used in osteosynthesis for decades and its compatibility and safety is unquestioned. Studies have shown that there is release and collection of titanium in the organ systems with little note of toxicity. The gold standard is considered to be titanium osteosynthesis plate produced by milling methods. The use of customized titanium plates produced with 3D printing, specifically direct metal laser sintering, have found increasing use in recent years. It is unknown how much titanium is released in these printed titanium implants, which is known to be potentially porous, depending on the heat settings of the printer. We hypothesize that the amount of titanium released in printed titanium implants may be potentially more or equal compared to the gold standard, which is the implant produced by milling. METHODS We studied the biosafety of this technology and its products by measuring serum and organ titanium levels after implantation of 3D-printed versus traditionally fabrication titanium plates and screws in a pilot study using the rabbit model. A total of nine rabbits were used, with three each in the control, milled and printed titanium group. The animals were euthanized after six months. Serum and organs of the reticuloendothelial system were harvested, digested and assayed for titanium levels. RESULTS Organ and serum titanium levels were significantly higher in rabbit subjects implanted with titanium implants (milled and printed) compared to the control group. However, there was no significant difference in organ and serum titanium levels of subjects implanted with milled and traditionally fabricated titanium implants. CONCLUSIONS The biosafety of use of 3D-printed titanium implants and traditionally fabricated titanium implants are comparable. With this in mind, 3D-printed custom implants can not only replace, but will very possibly surpass traditionally fabricated titanium implants in the mode and extent of use.
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Abstract
Implant-associated infections (IAIs) are among the most intractable and costly complications in implant surgery. They can lead to surgery failure, a high economic burden, and a decrease in patient quality of life. This manuscript is devoted to introducing current antimicrobial strategies for additively manufactured (AM) titanium (Ti) implants and fostering a better understanding in order to pave the way for potential modern high-throughput technologies. Most bactericidal strategies rely on implant structure design and surface modification. By means of rational structural design, the performance of AM Ti implants can be improved by maintaining a favorable balance between the mechanical, osteogenic, and antibacterial properties. This subject becomes even more important when working with complex geometries; therefore, it is necessary to select appropriate surface modification techniques, including both topological and chemical modification. Antibacterial active metal and antibiotic coatings are among the most commonly used chemical modifications in AM Ti implants. These surface modifications can successfully inhibit bacterial adhesion and biofilm formation, and bacterial apoptosis, leading to improved antibacterial properties. As a result of certain issues such as drug resistance and cytotoxicity, the development of novel and alternative antimicrobial strategies is urgently required. In this regard, the present review paper provides insights into the enhancement of bactericidal properties in AM Ti implants.
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Lee J, Lee JB, Yun J, Rhyu IC, Lee YM, Lee SM, Lee MK, Kim B, Kim P, Koo KT. The impact of surface treatment in 3-dimensional printed implants for early osseointegration: a comparison study of three different surfaces. Sci Rep 2021; 11:10453. [PMID: 34001989 PMCID: PMC8129142 DOI: 10.1038/s41598-021-89961-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/29/2021] [Indexed: 11/13/2022] Open
Abstract
3D printing technology has been gradually applied to various areas. In the present study, 3D-printed implants were fabricated with direct metal laser sintering technique for a dental single root with titanium. The 3D implants were allocated into following groups: not treated (3D-None), sandblasted with a large grit and acid-etched (3D-SLA), and target-ion-induced plasma-sputtered surface (3D-TIPS). Two holes were drilled in each tibia of rabbit, and the three groups of implants were randomly placed with a mallet. Rabbits were sacrificed at two, four, and twelve weeks after the surgery. Histologic and histomorphometric analyses were performed for the evaluation of mineralized bone-to-implant contact (mBIC), osteoid-to-implant contact (OIC), total bone-to-implant contact (tBIC), mineralized bone area fraction occupancy (mBAFO), osteoid area fraction occupancy (OAFO), and total bone area fraction occupancy (tBAFO) in the inner and outer areas of lattice structure. At two weeks, 3D-TIPS showed significantly higher inner and outer tBIC and inner tBAFO compared with other groups. At four weeks, 3D-TIPS showed significantly higher outer OIC than 3D-SLA, but there were no significant differences in other variables. At twelve weeks, there were no significant differences. The surface treatment with TIPS in 3D-printed implants could enhance the osseointegration process in the rabbit tibia model, meaning that earlier osseointegration could be achieved.
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Affiliation(s)
- Jungwon Lee
- One-Stop Specialty Center, Seoul National University Dental Hospital, Seoul, Republic of Korea.,Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea
| | - Jun-Beom Lee
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea
| | - Junseob Yun
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea
| | - In-Chul Rhyu
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea
| | - Yong-Moo Lee
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea
| | - Sung-Mi Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea.,Biomedical Implant Convergence Research Center, Advanced Institutes of Convergence Technology, Suwon, Korea
| | - Min-Kyu Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Byoungkook Kim
- 3D Printer R&D Team, Dentium Co., Ltd., Suwon, Republic of Korea
| | - Pangyu Kim
- 3D Printer R&D Team, Dentium Co., Ltd., Suwon, Republic of Korea
| | - Ki-Tae Koo
- Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea.
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Crenn MJ, Benoit A, Rohman G, Guilbert T, Fromentin O, Attal JP, Bardet C. Selective Laser Melted Titanium Alloy for Transgingival Components: Influence of Surface Condition on Fibroblast Cell Behavior. J Prosthodont 2021; 31:50-58. [PMID: 33569866 DOI: 10.1111/jopr.13347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2021] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To mechanically characterize and assess the biological properties of Ti6Al4V surfaces obtained by Selective Laser Melting in order to determine whether this process is conceivable for production of implant-supported prostheses and particularly trans-gingival components. As-built and polished surfaces were studied in comparison with components obtained by computer numerical control machining technology in order to consider whether the properties are in the same range as the conventional method currently used. MATERIALS AND METHODS Cylindrical specimens of Ti6Al4V (n = 6) were built with Selective Laser Melting for the characterization of mechanical properties according to ISO 22674 and discs (n = 12) were fabricated in the same conditions for cytotoxicity evaluation. Discs (n = 12) of Ti6Al4V were also obtained by computer numerical control machining as control. Half of the number of discs (n = 6) from each process were polished, to simulate the laboratory protocol for polishing of transmucosal components and half of the discs remained unaltered (as-built). Surface roughness measurements of disc specimens (as-built and polished) were compared with computer numerical control milling specimens (as-built and polished). Proliferation of human gingival fibroblasts on Ti6Al4V surfaces was also assessed for each condition. Viability and cell morphology were then evaluated qualitatively. Ra and Sa data were compared using Student's t-test (α = 0.05) and metabolic activity data were compared using Kruskal-Wallis statistical test (α = 0.05). RESULTS Selective Laser Melting specimens showed elongation at break greater than 2% and 0.2% yield strength better than 500MPa which complied with ISO 22674 standards. Although Selective Laser Melting samples displayed significantly increased roughness on as-built surfaces compared to computer numerically controlled milling samples (p < 0.05), no statistically significant difference was observed after mechanical polishing (p = 0.279). Regarding metabolic activity, no statistical difference was observed between groups at day 3 (p > 0.05) and fibroblasts showed a viability higher than 97% on all discs. Cell shapes on polished samples suggested moderate adhesion compared to unpolished samples. CONCLUSION With the manufacturing parameters selected in this study, Selective Laser Melting of Ti6Al4V appeared to be compatible with a prosthetic application type 4 according to ISO 22674. Surfaces obtained, followed by recommended postprocessing provided components with equivalent biological properties compared to computer numerical control machining technology.
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Affiliation(s)
| | | | | | | | | | | | - Claire Bardet
- Laboratory Orofacial Pathologies, Imaging and Biotherapies URP2496 and FHU-DDS-Net, Dental School, Université de Paris, Montrouge, France
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Li P, Gao Z, Tan Z, Xiao J, Wei L, Chen Y. New developments in anti-biofilm intervention towards effective management of orthopedic device related infections (ODRI's). BIOFOULING 2021; 37:1-35. [PMID: 33618584 DOI: 10.1080/08927014.2020.1869725] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 12/15/2020] [Accepted: 12/20/2020] [Indexed: 06/12/2023]
Abstract
Orthopedic device related infections (ODRI's) represent a difficult to treat situation owing to their biofilm based nature. Biofilm infections once established are difficult to eradicate even with an aggressive treatment regimen due to their recalcitrance towards antibiotics and immune attack. The involvement of antibiotic resistant pathogens as the etiological agent further worsens the overall clinical picture, pressing on the need to look into alternative treatment strategies. The present review highlightes the microbiological challenges associated with treatment of ODRI's due to biofilm formation on the implant surface. Further, it details the newer anti-infective modalities that work either by preventing biofilm formation and/or through effective disruption of the mature biofilms formed on the medical implant. The study, therefore aims to provide a comprehensive insight into the newer anti-biofilm interventions (non-antibiotic approaches) and a better understanding of their mechanism of action essential for improved management of orthopedic implant infections.
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Affiliation(s)
- Ping Li
- Department of Orthopedics, Ya'an People's Hospital, Yaan City, China
| | - Zhenwu Gao
- Department of Orthopedics, Shanxi Bethune Hospital, Taiyuan City, China
| | - Zhenwei Tan
- Department of Orthopedics, Western Theater Air Force Hospital of PLA, Chengdu, China
| | - Jun Xiao
- Department of Orthopedics, Ya'an People's Hospital, Yaan City, China
| | - Li Wei
- Nursing Department, Three Gorges Hospital Affiliated to Chongqing University, Chongqing, China
| | - Yirui Chen
- Department of Orthopedics, Three Gorges Hospital Affiliated to Chongqing University, Chongqing, China
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Abstract
This paper concerns the assessment of the current state of dentistry in the world and the prospects of its sustainable development. A traditional Chinese censer was adopted as the pattern, with a strong and stable support on three legs. The dominant diseases of the oral cavity are caries and periodontal diseases, with the inevitable consequence of toothlessness. From the caries 3.5–5 billion people suffer. Moreover, each of these diseases has a wide influence on the development of systemic complications. The territorial range of these diseases and their significant differentiation in severity in different countries and their impact on disability-adjusted life years index are presented (DALY). Edentulousness has a significant impact on the oral health-related quality of life (OHRQoL). The etiology of these diseases is presented, as well as the preventive and therapeutic strategies undertaken as a result of modifying the Deming circle through the fives’ rules idea. The state of development of Dentistry 4.0 is an element of the current stage of the industrial revolution Industry 4.0 and the great achievements of modern dental engineering. Dental treatment examples from the authors’ own clinical practice are given. The systemic safety of a huge number of dentists in the world is discussed, in place of the passive strategy of using more and more advanced personal protective equipment (PPE), introducing our own strategy for the active prevention of the spread of pathogenic microorganisms, including SARS-CoV-2. The ethical aspects of dentists’ activity towards their own patients and the ethical obligations of the dentist community towards society are discussed in detail. This paper is a polemic arguing against the view presented by a group of eminent specialists in the middle of last year in The Lancet. It is impossible to disagree with these views when it comes to waiting for egalitarianism in dental care, increasing the scope of prevention and eliminating discrimination in this area on the basis of scarcity and poverty. The views on the discrimination of dentistry in relation to other branches of medicine are far more debatable. Therefore, relevant world statistics for other branches of medicine are presented. The authors of this paper do not agree with the thesis that interventional dental treatment can be replaced with properly implemented prophylaxis. The final remarks, therefore, present a discussion of the prospects for the development of dentistry based on three pillars, analogous to the traditional Chinese censer obtaining a stable balance thanks to its three legs. The Dentistry Sustainable Development (DSD) > 2020 model, consisting of Global Dental Prevention (GDP), Advanced Interventionist Dentistry 4.0 (AID 4.0), and Dentistry Safety System (DSS), is presented.
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Influence of Surface Finishing on Corrosion Behaviour of 3D Printed TiAlV Alloy. METALS 2020. [DOI: 10.3390/met10111547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Additive manufacturing is currently one of the promising methods for the fabrication of products of complex shapes. It is also used in medical applications, thanks to technological progress, which also enables the printing of metallic materials. However, the final products often have to undergo a final surface treatment. In this work, the influence of surface finishing on the corrosion behavior of the medical alloy Ti-6Al-4V prepared by the selective laser melting technique is studied. The samples were subjected to mechanical, chemical and electrochemical treatments. Corrosion behavior was investigated using DC and AC electrochemical techniques such as potentiodynamic and potentiostatic curves and electrochemical impedance spectroscopy. Furthermore, the influence of surface treatments on the possibility of localized corrosion attack was evaluated. The results showed that the surface treatments have a positive effect on the corrosion resistance and reduce the risk of crevice corrosion.
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Cucchi A, Bianchi A, Calamai P, Rinaldi L, Mangano F, Vignudelli E, Corinaldesi G. Clinical and volumetric outcomes after vertical ridge augmentation using computer-aided-design/computer-aided manufacturing (CAD/CAM) customized titanium meshes: a pilot study. BMC Oral Health 2020; 20:219. [PMID: 32758217 PMCID: PMC7409710 DOI: 10.1186/s12903-020-01205-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 07/27/2020] [Indexed: 12/13/2022] Open
Abstract
Background One of the most recent innovations in bone augmentation surgery is represented by computer-aided-design/computer-aided-manufacturing (CAD/CAM) customized titanium meshes, which can be used to restore vertical bone defects before implant-prosthetic rehabilitations. The aim of this study was to evaluate the effectiveness/reliability of this technique in a consecutive series of cases. Methods Ten patients in need of bone augmentation before implant therapy were treated using CAD/CAM customized titanium meshes. A digital workflow was adopted to design virtual meshes on 3D bone models. Then, Direct Metal Laser Sintering (DMLS) technology was used to produce the titanium meshes, and vertical ridge augmentation was performed according to an established surgical protocol. Surgical complications, healing complications, vertical bone gain (VBG), planned bone volume (PBV), lacking bone volume (LBV), regenerated bone volume (RBV), average regeneration rate (RR) and implant success rate were evaluated. Results All augmented sites were successfully restored with definitive implant-supported fixed partial dentures. Measurements showed an average VBG of 4.5 ± 1.8 mm at surgical re-entry. Surgical and healing complications occurred in 30% and 10% of cases, respectively. Mean values of PBV, LBV, and RBV were 984, 92, and 892 mm3, respectively. The average RR achieved was 89%. All 26 implants were successfully in function after 1 year of follow-up. Conclusions The results of this study suggest that the bone augmentation by means of DMLS custom-made titanium meshes can be considered a reliable and effective technique in restoring vertical bone defects.
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Affiliation(s)
- Alessandro Cucchi
- Unit of Oral and Maxillofacial Surgery, Department of Biomedical and Neuromotor Science, University of Bologna, Bologna, Italy.
| | - Alessandro Bianchi
- Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Reggio Emilia, Italy
| | | | - Lisa Rinaldi
- Unit of Oral and Maxillofacial Surgery, Department of Biomedical and Neuromotor Science, University of Bologna, Bologna, Italy
| | - Francesco Mangano
- Department of Prevention and Communal Dentistry, Sechenov First State Medical University, Moscow, Russia
| | - Elisabetta Vignudelli
- Unit of Oral and Maxillofacial Surgery, Department of Biomedical and Neuromotor Science, University of Bologna, Bologna, Italy
| | - Giuseppe Corinaldesi
- Unit of Oral and Maxillofacial Surgery, Department of Biomedical and Neuromotor Science, University of Bologna, Bologna, Italy
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Revilla‐León M, Sadeghpour M, Özcan M. A Review of the Applications of Additive Manufacturing Technologies Used to Fabricate Metals in Implant Dentistry. J Prosthodont 2020; 29:579-593. [DOI: 10.1111/jopr.13212] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2020] [Indexed: 12/24/2022] Open
Affiliation(s)
- Marta Revilla‐León
- Comprehensive Dentistry Department, College of DentistryTexas A&M University Dallas TX
- Gradute Prosthodontics, Department of Restorative Dentistry, School of DentistryUniversity of Washington Seattle WA
| | - Mehrad Sadeghpour
- Revilla Research Center Madrid Spain
- Private practice in Dallas Dallas TX
| | - Mutlu Özcan
- Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Center for Dental and Oral MedicineUniversity of Zurich Zürich Switzerland
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Selective Laser Melting of Aluminum and Titanium Matrix Composites: Recent Progress and Potential Applications in the Aerospace Industry. AEROSPACE 2020. [DOI: 10.3390/aerospace7060077] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Selective laser melting (SLM) is a near-net-shape time- and cost-effective manufacturing technique, which can create strong and efficient components with potential applications in the aerospace industry. To meet the requirements of the growing aerospace industrial demands, lighter materials with enhanced mechanical properties are of the utmost need. Metal matrix composites (MMCs) are extraordinary engineering materials with tailorable properties, bilaterally benefiting from the desired properties of reinforcement and matrix constituents. Among a wide range of MMCs currently available, aluminum matrix composites (AMCs) and titanium matrix composites (TMCs) are highly potential candidates for aerospace applications owing to their outstanding strength-to-weight ratio. However, the feasibility of SLM-fabricated composites utilization in aerospace applications is still challenging. This review addresses the SLM of AMCs/TMCs by considering the processability (densification level) and microstructural evolutions as the most significant factors determining the mechanical properties of the final part. The mechanical properties of fabricated MMCs are assessed in terms of hardness, tensile/compressive strength, ductility, and wear resistance, and are compared to their monolithic states. The knowledge gained from process–microstructure–mechanical properties relationship investigations can pave the way to make the existing materials better and invent new materials compatible with growing aerospace industrial demands.
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Das A, Shukla M. Multifunctional hydroxyapatite and hopeite coatings on SS254 by laser rapid manufacturing for improved osseointegration and antibacterial character: A comparative study. Proc Inst Mech Eng H 2020; 234:720-727. [PMID: 32419610 DOI: 10.1177/0954411920917851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Orthopaedic metallic implant's long-term success strongly depends upon the two main factors: osseointegration and antibacterial character. Bioceramic (hydroxyapatite and hopeite) coatings have been proven effective for getting strong osseointegration and antibacterial character. However, deterioration of bioceramic coatings during the implantation period can adversely affect its overall biological performance. To conquer this issue, this research work recommends an innovative process route of laser rapid manufacturing for depositing bioceramic (hydroxyapatite and hopeite) coatings with metallurgical bonding. Microstructure, phase composition, antibacterial efficacy and bioactivity were evaluated using scanning electron microscopy, X-ray diffraction, fluorescence-activated cell sorting technique and simulated body fluid immersion test. The promising results obtained from these characterizations and testing establish the new process route laser rapid manufacturing as an effective alternative to deposit multifunctional bioceramic (hydroxyapatite and hopeite) coatings on metallic prosthetic-orthopaedic implants.
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Affiliation(s)
- Ashish Das
- Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India
- Department of Production & Industrial Engineering, National Institute of Technology Jamshedpur, Jamshedpur, India
| | - Mukul Shukla
- Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India
- School of Mechanical and Aerospace Engineering, Queen's University Belfast, Belfast, UK
- Department of Mechanical Engineering Technology, University of Johannesburg, Johannesburg, South Africa
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Kobylinski J, Hitzler L, Lawitzki R, Krempaszky C, Öchsner A, Werner E. Relationship between Phase Fractions and Mechanical Properties in Heat‐Treated Laser Powder‐Bed Fused Co‐Based Dental Alloys. Isr J Chem 2020. [DOI: 10.1002/ijch.201900156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jonas Kobylinski
- Institute of Materials Science and Mechanics of MaterialsTechnical University of Munich Boltzmannstr. 15 85748 Garching Germany
| | - Leonhard Hitzler
- Institute of Materials Science and Mechanics of MaterialsTechnical University of Munich Boltzmannstr. 15 85748 Garching Germany
| | - Robert Lawitzki
- Institute of Materials Science, Chair of Materials PhysicsUniversity of Stuttgart Heisenbergstr. 3 70569 Stuttgart Germany
| | - Christian Krempaszky
- Institute of Materials Science and Mechanics of MaterialsTechnical University of Munich Boltzmannstr. 15 85748 Garching Germany
| | - Andreas Öchsner
- Faculty of Mechanical EngineeringEsslingen University of Applied Sciences Kanalstraße 33 73728 Esslingen Germany
| | - Ewald Werner
- Institute of Materials Science and Mechanics of MaterialsTechnical University of Munich Boltzmannstr. 15 85748 Garching Germany
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Cumulative Inaccuracies in Implementation of Additive Manufacturing Through Medical Imaging, 3D Thresholding, and 3D Modeling: A Case Study for an End-Use Implant. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10082968] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In craniomaxillofacial surgical procedures, an emerging practice adopts the preoperative virtual planning that uses medical imaging (computed tomography), 3D thresholding (segmentation), 3D modeling (digital design), and additive manufacturing (3D printing) for the procurement of an end-use implant. The objective of this case study was to evaluate the cumulative spatial inaccuracies arising from each step of the process chain when various computed tomography protocols and thresholding values were independently changed. A custom-made quality assurance instrument (Phantom) was used to evaluate the medical imaging error. A sus domesticus (domestic pig) head was analyzed to determine the 3D thresholding error. The 3D modeling error was estimated from the computer-aided design software. Finally, the end-use implant was used to evaluate the additive manufacturing error. The results were verified using accurate measurement instruments and techniques. A worst-case cumulative error of 1.7 mm (3.0%) was estimated for one boundary condition and 2.3 mm (4.1%) for two boundary conditions considering the maximum length (56.9 mm) of the end-use implant. Uncertainty from the clinical imaging to the end-use implant was 0.8 mm (1.4%). This study helps practitioners establish and corroborate surgical practices that are within the bounds of an appropriate accuracy for clinical treatment and restoration.
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Full-Digital Workflow for Fabricating a Custom-Made Direct Metal Laser Sintering (DMLS) Mandibular Implant: A Case Report. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17082693. [PMID: 32295196 PMCID: PMC7215385 DOI: 10.3390/ijerph17082693] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 04/07/2020] [Accepted: 04/08/2020] [Indexed: 12/20/2022]
Abstract
Direct Laser Metal Sintering (DLMS) is an additive manufacturing (AM) technique that is capable of manufacturing metal parts according to a three-dimensional (3D) design made using computer-assisted-design (CAD) software, thanks to a powerful laser beam that melts selectively micro-powder layers, one on top of the other, until the desired object is generated. With DMLS, it is now possible to fabricate custom-made titanium implants for oral and maxillofacial applications. We present the case of a 67-year-old woman diagnosed with a squamous cell carcinoma of the mandible. The patient underwent subtotal mandibular resection; conventional reconstruction procedures failed to rehabilitate the function of the mandible. A prosthesis replacing the resected mandible was designed and fabricated using a digital workflow. The extensive bone defect was rehabilitated with a prosthesis replacing the mandibular bone and supporting a morse-taper dental prosthesis. The masticatory function was reestablished.
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Qasim SSB, Zafar MS, Niazi FH, Alshahwan M, Omar H, Daood U. Functionally graded biomimetic biomaterials in dentistry: an evidence-based update. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2020; 31:1144-1162. [PMID: 32202207 DOI: 10.1080/09205063.2020.1744289] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Design and development of novel therapeutic strategies to regenerate lost tissue structure and function is a serious clinical hurdle for researchers. Traditionally, much of the research is dedicated in optimising properties of scaffolds. Current synthetic biomaterials remain rudimentary in comparison to their natural counterparts. The ability to incorporate biologically inspired elements into the design of synthetic materials has advanced with time. Recent reports suggest that functionally graded material mimicking the natural tissue morphology can have a more exaggerated response on the targeted tissue. The aim of this review is to deliver an overview of the functionally graded concept with respect to applications in clinical dentistry. A comprehensive understanding of spatiotemporal arrangement in fields of restorative, prosthodontics, periodontics, orthodontics and oral surgery is presented. Different processing techniques have been adapted to achieve such gradients ranging from additive manufacturing (three dimensional printing/rapid prototyping) to conventional techniques of freeze gelation, freeze drying, electrospinning and particulate leaching. The scope of employing additive manufacturing technique as a reliable and predictable tool for the design and accurate reproduction of biomimetic templates is vast by any measure. Further research in the materials used and refinement of the synthesis techniques will continue to expand the frontiers of functionally graded membrane based biomaterials application in the clinical domain.
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Affiliation(s)
- Syed Saad Bin Qasim
- Faculty of Dentistry, Department of Biomaterials, University of Oslo, Blindern, Oslo, Norway.,Department of Bioclinical Sciences, Faculty of Dentistry, Kuwait University, Kuwait
| | - Muhammad Sohail Zafar
- Department of Restorative Dentistry, College of Dentistry, Taibah University, Medina Munawwarah, Saudi Arabia.,Department of Dental Materials, Islamic International Dental College, Riphah International University, Islamabad, Pakistan
| | - Fayez Hussain Niazi
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar al Uloom University, Riyadh, Saudi Arabia
| | - Majid Alshahwan
- Department of Rehabilitation Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Hanan Omar
- Clinical Dentistry, Restorative Division, Faculty of Dentistry, International Medical University Kuala Lumpur, Bukit Jalil, Malaysia Bukit Jalil, Wilayah Persekutuan Kuala Lumpur
| | - Umer Daood
- Clinical Dentistry, Restorative Division, Faculty of Dentistry, International Medical University Kuala Lumpur, Bukit Jalil, Malaysia Bukit Jalil, Wilayah Persekutuan Kuala Lumpur
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Mangano C, Bianchi A, Mangano FG, Dana J, Colombo M, Solop I, Admakin O. Custom-made 3D printed subperiosteal titanium implants for the prosthetic restoration of the atrophic posterior mandible of elderly patients: a case series. 3D Print Med 2020; 6:1. [PMID: 31915946 PMCID: PMC6950914 DOI: 10.1186/s41205-019-0055-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 12/20/2019] [Indexed: 11/24/2022] Open
Abstract
Purpose To present the application of custom-made 3D-printed subperiosteal implants for fixed prosthetic restoration of the atrophic posterior mandible of elderly patients. Methods Between January 2017 and June 2018, all partially edentulous patients aged over 65 years, with two or more missing teeth in the posterior atrophic mandible, and who did not want to undergo bone regenerative procedures, were included in this study. These patients were rehabilitated with custom-made subperiosteal implants, designed from cone beam computed tomography (CBCT) and fabricated in titanium by means of direct metal laser sintering (DMLS). The outcome measures were fit and stability of the implants at placement, duration of the intervention, implant survival, and early and late complications. All patients were followed for 1 year after surgery. Results Ten patients (four males, six females; mean age 69.6, SD ± 2.8, median 69, 95% CI 67.9–71.6) were included in the study. The fit of the implants was satisfactory, with a mean rating of 7 out of 10 (SD ± 1.6, median 7, 95% CI 6–8). Only two implants had insufficient fit, because of the presence of scattering in the CBCT; however, they were adapted to the sites during the interventions. The mean duration of the intervention was 44.3 min (SD ± 19.4, median 37, 95% CI 32.3–56.3). At the one-year follow-up, no implants were lost (survival rate 100%). One implant presented immediate postoperative complications with pain, discomfort and swelling, and two patients experienced late complications, having their provisional restorations fractured during the temporisation phase. All these complications were minor in nature, but the final complication rate amounted to 30% (three of ten patients). Conclusions Although this study has limits (small patient sample and short follow-up), DMLS has proven to be an effective method for fabricating accurate subperiosteal implants, with high survival rates. This may represent an alternative treatment procedure in elderly patients with a severely atrophic posterior mandible, since it allows avoidance of regenerative bone therapies. Further studies are needed to confirm these outcomes.
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Affiliation(s)
- Carlo Mangano
- Department of Dental Sciences, University Vita Salute S. Raffaele, 20132, Milan, Italy
| | - Andrea Bianchi
- Department of Periodontology and Implantology, Istituto Stomatologico Italiano, 20122, Milan, Italy
| | - Francesco Guido Mangano
- Department of Prevention and Communal Dentistry, Sechenov First Moscow State Medical University, 119991, Moscow, Russia.
| | | | | | - Ivan Solop
- Department of Prevention and Communal Dentistry, Sechenov First Moscow State Medical University, 119991, Moscow, Russia
| | - Oleg Admakin
- Department of Prevention and Communal Dentistry, Sechenov First Moscow State Medical University, 119991, Moscow, Russia
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Dos Santos LCP, Malheiros FC, Guarato AZ. Surface parameters of as-built additive manufactured metal for intraosseous dental implants. J Prosthet Dent 2019; 124:217-222. [PMID: 31759564 DOI: 10.1016/j.prosdent.2019.09.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 09/11/2019] [Accepted: 09/11/2019] [Indexed: 12/17/2022]
Abstract
STATEMENT OF PROBLEM To improve osseointegration, current machined implants are submitted to different surface treatments such as airborne-particle abrasion and acid etching. Although additive manufacturing has allowed the fabrication of implants with custom design, porosity, and roughness, whether good osseointegration can be achieved without subsequent surface treatments is still unclear. PURPOSE The purpose of this in vitro study was to investigate the feasibility of using additive manufacturing technology for dental implants without the use of subsequent surface treatments. MATERIAL AND METHODS The roughness, wettability, and surface energy of a flat test stainless-steel specimen produced from a 3D printer were evaluated. The roughness measurements were obtained by using a mechanical contact profilometer. The wettability was characterized by the sessile drop method by using deionized water and ethylene glycol. The surface energy values were calculated by using the Owens, Wendt, Rabel, and Kaeble (OWRK) computational method. RESULTS The experimental data obtained were Ra=4.55 μm, Rq=5.64 μm, RSm=0.235 mm, Rsk=-0.071, Rku=3.740, Rdq=13 degrees; water contact angle=66 degrees; ethylene glycol contact angle=57 degrees; surface energy=38 mN/m. The measured values were compared with data reported in the literature for commercially available implants. The parameter Ra, which is the most used parameter to describe the surface of dental implants, was 50%, 270%, and 329% higher than that reported in the literature for commercial dental implants. The surface energy was 10% and 19% lower than the representative values in the literature for commercial dental implants. CONCLUSIONS The results indicate that specimens fabricated by additive manufacturing had higher roughness and lower surface energy than reported results in the literature. Therefore, additive manufacturing was found to produce suitable surface parameters for dental implants, and subsequent surface treatments could be removed from the manufacturing process.
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Xu HD, Miron RJ, Zhang XX, Zhang YF. Allogenic tooth transplantation using 3D printing: A case report and review of the literature. World J Clin Cases 2019; 7:2587-2596. [PMID: 31559297 PMCID: PMC6745321 DOI: 10.12998/wjcc.v7.i17.2587] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 06/25/2019] [Accepted: 07/20/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND The history of allogenic tooth transplantation can be traced back to the 16th century. Although there have been many successful cases, much needs to be better understood and researched prior to the technique being translated to everyday clinical practice. CASE SUMMARY In the present report, we describe a case of allogenic tooth transplantation between a mother and her daughter. The first left maxillary molar of the mother was diagnosed with residual root resorption and needed to be extracted. The 3rd molar of the daughter was used as a donor tooth. Prior to transplantation, a 3D printing system was introduced to fabricate an individualized reamer drill specifically designed utilizing the donor's tooth as a template. The specific design of our 3D printed bur allowed for the recipient site to better match the donor tooth. With the ability to 3D print in layers, even the protuberance of the root can be matched and 3D printed, thereby minimizing unnecessary bone loss. CONCLUSION Our study is a pioneering case combining 3D printing with allogenic tooth transplantation, which could be able to minimize unnecessary bone loss and improve the implant stability. This article aims to enhance our understanding of allogenic tooth transplantation and 3D printing, and may potentially lead to tooth transplantation being utilized more frequently - especially since transplantations are so commonly utilized in many other fields of medicine with high success rates.
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Affiliation(s)
- Hu-Di Xu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, Wuhan University, Wuhan 430079, Hubei Province, China
| | - Richard J Miron
- Department of Periodontology, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314-7796, United States
| | - Xiao-Xin Zhang
- Department of Oral Implantology, School of Stomatology, Wuhan University, Wuhan 430079, Hubei Province, China
| | - Yu-Feng Zhang
- Department of Oral Implantology, School of Stomatology, Wuhan University, Wuhan 430079, Hubei Province, China
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Abdollahi S, Boktor J, Hibino N. Bioprinting of freestanding vascular grafts and the regulatory considerations for additively manufactured vascular prostheses. Transl Res 2019; 211:123-138. [PMID: 31201778 PMCID: PMC6702084 DOI: 10.1016/j.trsl.2019.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 05/15/2019] [Accepted: 05/23/2019] [Indexed: 12/31/2022]
Abstract
Vasculature is the network of blood vessels of an organ or body part that allow for the exchange of nutrients and waste to and from every cell, thus establishing a circulatory equilibrium. Vascular health is at risk from a variety of conditions that includes disease and trauma. In some cases, medical therapy can alleviate the impacts of the condition. Intervention is needed in other instances to restore the health of abnormal vasculature. The main approaches to treat vascular conditions are endovascular procedures and open vascular reconstruction that often requires a graft to accomplish. However, current vascular prostheses have limitations that include size mismatch with the native vessel, risk of immunogenicity from allografts and xenografts, and unavailability of autografts. In this review, we discuss efforts in bioprinting, an emerging method for vascular reconstruction. This includes an overview of 3D printing processes and materials, graft characterization strategies and the regulatory aspects to consider for the commercialization of 3D bioprinted vascular prostheses.
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Affiliation(s)
- Sara Abdollahi
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Joseph Boktor
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland; Department of Biology, Johns Hopkins University, Baltimore, Maryland
| | - Narutoshi Hibino
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
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Chang JZC, Tsai PI, Kuo MYP, Sun JS, Chen SY, Shen HH. Augmentation of DMLS Biomimetic Dental Implants with Weight-Bearing Strut to Balance of Biologic and Mechanical Demands: From Bench to Animal. MATERIALS 2019; 12:ma12010164. [PMID: 30621012 PMCID: PMC6337105 DOI: 10.3390/ma12010164] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 12/24/2018] [Accepted: 12/27/2018] [Indexed: 12/16/2022]
Abstract
A mismatch of elastic modulus values could result in undesirable bone resorption around the dental implant. The objective of this study was to optimize direct metal laser sintering (DMLS)-manufactured Ti₆Al₄V dental implants' design, minimize elastic mismatch, allow for maximal bone ingrowth, and improve long-term fixation of the implant. In this study, DMLS dental implants with different morphological characteristics were fabricated. Three-point bending, torsional, and stability tests were performed to compare the mechanical properties of different designs. Improvement of the weaker design was attempted by augmentation with a longitudinal 3D-printed strut. The osseointegrative properties were evaluated. The results showed that the increase in porosity decreased the mechanical properties, while augmentation with a longitudinal weight-bearing strut can improve mechanical strength. Maximal alkaline phosphatase gene expression of MG63 cells attained on 60% porosity Ti₆Al₄V discs. In vivo experiments showed good incorporation of bone into the porous scaffolds of the DMLS dental implant, resulting in a higher pull-out strength. In summary, we introduced a new design concept by augmenting the implant with a longitudinal weight-bearing strut to achieve the ideal combination of high strength and low elastic modulus; our results showed that there is a chance to reach the balance of both biologic and mechanical demands.
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Affiliation(s)
| | - Pei-I Tsai
- Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan.
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan.
| | - Mark Yen-Ping Kuo
- School of Dentistry, College of Medicine, National Taiwan University, Taipei 10051, Taiwan.
| | - Jui-Sheng Sun
- Department of Orthopedic Surgery, College of Medicine, National Taiwan University, Taipei 10002, Taiwan.
| | - San-Yuan Chen
- Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan.
| | - Hsin-Hsin Shen
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan.
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Mangano C, Mangano FG, Shibli JA, Roth LA, d' Addazio G, Piattelli A, Iezzi G. Immunohistochemical Evaluation of Peri-Implant Soft Tissues around Machined and Direct Metal Laser Sintered (DMLS) Healing Abutments in Humans. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15081611. [PMID: 30061523 PMCID: PMC6121298 DOI: 10.3390/ijerph15081611] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 07/09/2018] [Accepted: 07/26/2018] [Indexed: 12/11/2022]
Abstract
Background: Direct metal laser Sintering (DMLS) is an additive manufacturing technique that allows fabrication of dental implants and related components with a highly porous surface. To date, no human studies have investigated the soft tissue adhesion and presence of inflammatory infiltrate with porous DMLS healing abutments (HAs), nor have they compared these with the classic machined ones. Purpose: To evaluate the degree of cell adhesion (integrin expression) and the quantity/quality of inflammatory infiltrate, on HAs with different surfaces; full DMLS, full machined, and hybrid (half DMLS and half machined). Methods: Fifty implant patients were randomly assigned to receive one of these different Has: T1, full DMLS (11 subjects); T2, machined in the upper portion and DMLS in the lower one (10 subjects); T3, DMLS in the upper portion and machined in the lower one (19 subjects); T4, full machined (10 patients). Thirty days after placement, circular sections of soft tissues around HAs were retrieved for immunohistochemical evaluation. Results: With regard to the adhesion molecules, the samples showed different intensity of integrin expression, with a statistically significant difference (p < 0.001) between T1 and the other groups. All the samples were positive for the different clusters related to the inflammatory infiltrate (T lymphocytes, CD3; B lymphocytes, CD20; and macrophages, CD68), but a lower infiltrate was found in T1, with statistically significant differences (p < 0.001) among the groups. Conclusions: The HA surface seems to influence the degree of cell adhesion and the inflammatory infiltrate of the surrounding soft tissues.
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Affiliation(s)
- Carlo Mangano
- Department of Dental Sciences, Dental School, San Raffaele University, Milan 20132, Italy.
| | - Francesco Guido Mangano
- Department of Medicine and Surgery, Dental School, Insubria University, Varese 21100, Italy.
| | - Jamil Awad Shibli
- Department of Periodontology and Oral Implantology, Dental Research Division, Guarulhos University, Guarulhos 743372, SP, Brazil.
| | - Leandro Amadeu Roth
- Department of Periodontology and Oral Implantology, Dental Research Division, Guarulhos University, Guarulhos 743372, SP, Brazil.
| | - Gianmaria d' Addazio
- Department of Medical, Oral and Biotechnological Sciences, University G. d'Annunzio, Chieti 66100, Italy.
| | - Adriano Piattelli
- Department of Medical, Oral and Biotechnological Sciences, University G. d'Annunzio, Chieti 66100, Italy.
- Catholic University of San Antonio de Murcia (UCAM), Murcia 30107, Spain.
| | - Giovanna Iezzi
- Department of Medical, Oral and Biotechnological Sciences, University G. d'Annunzio, Chieti 66100, Italy.
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Affiliation(s)
- Srinivasa Prasad
- Meenakshi Ammal Dental College & Hospital, Maduravoyal, Chennai, Tamil Nadu, 600 095, India
| | - Nourah Abdul Kader
- Private Practitioner, All Smiles Dental Clinic, Chennai, Tamil Nadu, 600 090, India
| | - G Sujatha
- Sri Venkateswara Dental College & Hospital, Thalambur, Chennai, Tamil Nadu, 603 103, India
| | - Thirumal Raj
- Department of Oral Pathology & Microbiology, Sri Venkateswara Dental College & Hospital, Thalambur, Chennai, Tamil Nadu, 603 103, India
| | - Shankargouda Patil
- Department of Maxillofacial Surgery & Diagnostic Sciences, Division of Oral Pathology, College of Dentistry, Jazan University, Jazan, 45 142, Saudi Arabia
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Gehrke SA, Pérez-Díaz L, Dedavid BA. Quasi-static strength and fractography analysis of two dental implants manufactured by direct metal laser sintering. Clin Implant Dent Relat Res 2018; 20:368-374. [PMID: 29380504 DOI: 10.1111/cid.12590] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 01/17/2018] [Accepted: 01/17/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND New manufacturing methods was developed to improve the tissues integration with the titanium alloy pieces. OBJECTIVE The present in vitro study was to assess the resistance and fracture mode after applied a quasi-static compressive force on the two dental implants manufactured by direct metal laser sintering. MATERIALS AND METHODS Twenty dental implants manufactured by direct metal laser sintering, using titanium alloy (Ti-6Al-4V) granules in two designs (n = 10 per group): Conventional dental implant (group Imp1) two-piece implant design, where the surgical implant and prosthetic abutment are two separate components and, the one-piece implant (group Imp2), where the surgical implant and prosthetic abutment are one integral piece. All samples were subjected to quasi-static loading at a 30° angle to the implant axis in a universal testing machine. RESULTS The mean fracture strengths were 1269.2 ± 128.8 N for the group Imp1 and, 1259.5 ± 115.1 N for the group Imp2, without statistical differences (P = .8722). In both groups, the fracture surface does not present crack between the compact core and the superficial (less dense and porous) part of the implants. CONCLUSIONS Based on the measured resistance data for the two implant models manufactured by direct metal laser sintering tested in the present study, we can suggest that they have adequate capacity to withstand the masticatory loads.
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Affiliation(s)
- Sergio Alexandre Gehrke
- Department of Research, Biotecnos Research Center, Montevideo, Uruguay.,Department of Biotechnology of the University Catholica San Antonio de Murcia (UCAM), Murcia, Spain.,Department of Materials Engineering, Pontificial Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Leticia Pérez-Díaz
- Researcher of the Laboratorio de Interacciones Moleculares, Facultad de Ciencias, Universidad de la Republica, Montevideo, Uruguay
| | - Berenice Anina Dedavid
- Department of Materials Engineering, Pontificial Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
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Hartjen P, Nada O, Silva TG, Precht C, Henningsen A, Holthaus MGRO, Gulow N, Friedrich RE, Hanken H, Heiland M, Zwahr C, Smeets R, Jung O. Cytocompatibility of Direct Laser Interference-patterned Titanium Surfaces for Implants. ACTA ACUST UNITED AC 2017; 31:849-854. [PMID: 28882950 DOI: 10.21873/invivo.11138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 08/02/2017] [Accepted: 08/04/2017] [Indexed: 12/18/2022]
Abstract
In an effort to generate titanium surfaces for implants with improved osseointegration, we used direct laser interference patterning (DLIP) to modify the surface of pure titanium grade 4 of four different structures. We assessed in vitro cytoxicity and cell attachment, as well as the viability and proliferation of cells cultured directly on the surfaces. Attachment of the cells to the modified surfaces was comparably good compared to that of cells on grit-blasted and acid-etched reference titanium surfaces. In concordance with this, viability and proliferation of the cells directly cultured on the specimens were similar on all the titanium surfaces, regardless of the laser modification, indicating good cytocompatibility.
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Affiliation(s)
- Philip Hartjen
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ola Nada
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thiago Gundelwein Silva
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Clarissa Precht
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anders Henningsen
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | | | - Reinhard E Friedrich
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Henning Hanken
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Max Heiland
- Department of Oral and Maxillofacial Surgery, Charité University Hospital, Berlin, Germany
| | - Christoph Zwahr
- Institute of Manufacturing Technology, TU Dresden, Dresden, Germany.,Fraunhofer Institute for Material and Beam Technology, Dresden, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ole Jung
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Histological Evidence of the Osseointegration of Fractured Direct Metal Laser Sintering Implants Retrieved after 5 Years of Function. BIOMED RESEARCH INTERNATIONAL 2017; 2017:9732136. [PMID: 28929117 PMCID: PMC5592009 DOI: 10.1155/2017/9732136] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 07/30/2017] [Indexed: 11/17/2022]
Abstract
Background Direct metal laser sintering (DMLS) is an additive manufacturing technique that allows the fabrication of dental implants layer by layer through the laser fusion of titanium microparticles. The surface of DMLS implants is characterized by a high open porosity with interconnected pores of different sizes; therefore, it has the potential to enhance and accelerate bone healing. To date, however, there are no histologic/histomorphometric studies in the literature evaluating the interface between bone and DMLS implants in the long-term. Purpose To evaluate the interface between bone and DMLS implants retrieved after 5 years of functional loading. Methods Two fractured DMLS implants were retrieved from the human jaws, using a 5 mm trephine bur. Both the implants were clinically stable and functioned regularly before fracture. The specimens were processed for histologic/histomorphometric evaluation; the bone-to-implant contact (BIC%) was calculated. Results Compact, mature lamellar bone was found over most of the DMLS implants in close contact with the implant surface; the histomorphometric evaluation showed a mean BIC% of 66.1% (±4.5%). Conclusions The present histologic/histomorphometric study showed that DMLS implants were well integrated in bone, after 5 years of loading, with the peri-implant bone undergoing continuous remodeling at the interface.
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Intrinsic Osteoinductivity of Porous Titanium Scaffold for Bone Tissue Engineering. Int J Biomater 2017; 2017:5093063. [PMID: 28814954 PMCID: PMC5549492 DOI: 10.1155/2017/5093063] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 06/07/2017] [Indexed: 01/08/2023] Open
Abstract
Large bone defects and nonunions are serious complications that are caused by extensive trauma or tumour. As traditional therapies fail to repair these critical-sized defects, tissue engineering scaffolds can be used to regenerate the damaged tissue. Highly porous titanium scaffolds, produced by selective laser sintering with mechanical properties in range of trabecular bone (compressive strength 35 MPa and modulus 73 MPa), can be used in these orthopaedic applications, if a stable mechanical fixation is provided. Hydroxyapatite coatings are generally considered essential and/or beneficial for bone formation; however, debonding of the coatings is one of the main concerns. We hypothesised that the titanium scaffolds have an intrinsic potential to induce bone formation without the need for a hydroxyapatite coating. In this paper, titanium scaffolds coated with hydroxyapatite using electrochemical method were fabricated and osteoinductivity of coated and noncoated scaffolds was compared in vitro. Alizarin Red quantification confirmed osteogenesis independent of coating. Bone formation and ingrowth into the titanium scaffolds were evaluated in sheep stifle joints. The examinations after 3 months revealed 70% bone ingrowth into the scaffold confirming its osteoinductive capacity. It is shown that the developed titanium scaffold has an intrinsic capacity for bone formation and is a suitable scaffold for bone tissue engineering.
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Early Bone Response to Dual Acid-Etched and Machined Dental Implants Placed in the Posterior Maxilla: A Histologic and Histomorphometric Human Study. IMPLANT DENT 2017; 26:24-29. [PMID: 27861190 DOI: 10.1097/id.0000000000000511] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE To compare the early bone response to implants with dual acid-etched (DAE) and machined (MA) surface, when placed in the posterior human maxilla. MATERIALS AND METHODS Fourteen patients received 2 implants in the posterior maxilla: 1 DAE and 1 MA. After 2 months, the implants were retrieved for histologic/histomorphometric evaluation. The bone-to-implant contact (BIC%), bone density in the threaded area (BDTA%), and the bone density (BD%) were calculated. The Wilcoxon matched-pairs signed rank test was used to evaluate differences (BIC%, BDTA%, and BD%) between the surfaces. RESULTS In the MA implants, a mean (±SD) BIC%, BDTA%, and BD% of 21.76 (±12.79), 28.58 (±16.91), and 21.54 (±11.67), respectively, was reported. In the DAE implants, a mean (±SD) BIC%, BDTA%, and BD% of 37.49 (±29.51), 30.59 (±21.78), and 31.60 (±18.06), respectively, was reported. Although the mean BIC% of DAE implants value was almost double than that of MA implants, no significant differences were found between the 2 groups with regard to BIC% (P = 0.198) and with regard to BDTA% (P = 0.778) and BD% (P = 0.124). CONCLUSIONS The DAE surface increased the periimplant endosseous healing properties in the native bone of the posterior maxilla.
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Youssef A, Hollister SJ, Dalton PD. Additive manufacturing of polymer melts for implantable medical devices and scaffolds. Biofabrication 2017; 9:012002. [DOI: 10.1088/1758-5090/aa5766] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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