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Kohal RJ, Riesterer E, Vach K, Patzelt SBM, Iveković A, Einfalt L, Kocjan A, Hillebrecht AL. Fracture Resistance of a Bone-Level Two-Piece Zirconia Oral Implant System-The Influence of Artificial Loading and Hydrothermal Aging. J Funct Biomater 2024; 15:122. [PMID: 38786633 PMCID: PMC11122605 DOI: 10.3390/jfb15050122] [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: 02/14/2024] [Revised: 04/24/2024] [Accepted: 05/04/2024] [Indexed: 05/25/2024] Open
Abstract
Preclinical and clinical research on two-piece zirconia implants are warranted. Therefore, we evaluated the in vitro fracture resistance of such a zirconia oral implant system. The present study comprised 32 two-piece zirconia implants and abutments attached to the implants using a titanium (n = 16) or a zirconia abutment screw (n = 16). Both groups were subdivided (n = 8): group T-0 comprised implants with a titanium abutment screw and no artificial loading; group T-HL was the titanium screw group exposed to hydro-thermomechanical loading in a chewing simulator; group Z-0 was the zirconia abutment screw group with no artificial loading; and group Z-HL comprised the zirconia screw group with hydro-thermomechanical loading. Groups T-HL and Z-HL were loaded with 98 N and aged in 85 °C hot water for 107 chewing cycles. All samples were loaded to fracture. Kruskal-Wallis tests were executed to assess the loading/bending moment group differences. The significance level was established at a probability of 0.05. During the artificial loading, there was a single occurrence of an implant fracture. The mean fracture resistances measured in a universal testing machine were 749 N for group T-0, 828 N for group Z-0, 652 N for group T-HL, and 826 N for group Z-HL. The corresponding bending moments were as follows: group T-0, 411 Ncm; group Z-0, 452 Ncm; group T-HL, 356 Ncm; and group Z-HL, 456 Ncm. There were no statistically significant differences found between the experimental groups. Therefore, the conclusion was that loading and aging did not diminish the fracture resistance of the evaluated implant system.
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Affiliation(s)
- Ralf J. Kohal
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (E.R.)
| | - Ellen Riesterer
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (E.R.)
| | - Kirstin Vach
- Medical Center—University of Freiburg, Institute of Medical Biometry and Statistics, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany;
| | - Sebastian B. M. Patzelt
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (E.R.)
- Private Dental Clinic, 78658 Zimmern ob Rottweil, Germany
| | - Aljaž Iveković
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (A.I.); (L.E.)
| | - Lara Einfalt
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (A.I.); (L.E.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Andraž Kocjan
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (A.I.); (L.E.)
| | - Anna-Lena Hillebrecht
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (E.R.)
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Characterization and In Vitro Cytotoxicity Safety Screening of Fractionated Organosolv Lignin on Diverse Primary Human Cell Types Commonly Used in Tissue Engineering. BIOLOGY 2022; 11:biology11050696. [PMID: 35625424 PMCID: PMC9139013 DOI: 10.3390/biology11050696] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 04/25/2022] [Accepted: 04/27/2022] [Indexed: 11/16/2022]
Abstract
Simple Summary As global efforts to use eco-friendly and reusable materials increase, the use of lignin from waste biomass will continue to intensify. Lignin is an underutilized biowaste macromolecule that is gaining considerable interest in biomedical research. However, the source of lignin and the extraction process heavily influence its chemistry, which can influence a cell’s reaction to lignin. Organosolv lignin is extracted via an eco-friendly process from leftover waste material. Few studies have tested the biocompatibility of organosolv lignins with human cells. We extensively characterized fractionated organosolv lignin and performed in vitro cytotoxicity safety screening on diverse primary human cell types commonly used in tissue engineering. This is the first study to show that, at a balanced concentration, fractionated low MW beechwood-derived organosolv lignin is non-cytotoxic to highly relevant human cell types used in tissue engineering including human bone marrow-derived mesenchymal stromal cells (MSCs), chondrocytes, osteoblasts, periodontal ligament fibroblasts, gingival fibroblasts and keratinocytes. Additionally, we show that organosolv lignin can be used to fabricate cell scaffolds and that addition of lignin increased the stiffness and viscosity of the scaffolds as well as cell attachment. This suggests that organosolv lignin may be used in the generation of tissue-like biomaterial-based constructs for tissue repair. Abstract There is limited data assessing the cytotoxic effects of organosolv lignin with cells commonly used in tissue engineering. Structural and physico-chemical characterization of fractionated organosolv lignin showed that a decrease of the molecular weight (MW) is accompanied by a less branched conformation of the phenolic biopolymer (higher S/G ratio) and an increased number of aliphatic hydroxyl functionalities. Enabling stronger polymer−solvent interactions, as proven by the Hansen solubility parameter analysis, low MW organosolv lignin (2543 g/mol) is considered to be compatible with common biomaterials. Using low MW lignin, high cell viability (70–100%) was achieved after 2 h, 24 h and 7 days using the following lignin concentrations: MSCs and osteoblasts (0.02 mg/mL), gingival fibroblasts and keratinocytes (0.02 to 0.04 mg/mL), periodontal ligament fibroblasts and chondrocytes (0.02 to 0.08 mg/mL). Cell viability was reduced at higher concentrations, indicating that high concentrations are cytotoxic. Higher cell viability was attained using 30/70 (w/v) NaOH vs. 40/60 (w/v) EtOH as the initial lignin solvent. Hydrogels containing low MW lignin (0.02 to 0.3 mg/mL) in agarose dose-dependently increased chondrocyte attachment (cell viability 84–100%) and hydrogel viscosity and stiffness to 3–11 kPa, similar to the pericellular matrix of chondrocytes. This suggests that low MW organosolv lignin may be used in many tissue engineering fields.
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Van den Borre CE, Zigterman BGR, Mommaerts MY, Braem A. How surface coatings on titanium implants affect keratinized tissue: A systematic review. J Biomed Mater Res B Appl Biomater 2022; 110:1713-1723. [PMID: 35103386 PMCID: PMC9306745 DOI: 10.1002/jbm.b.35025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 11/24/2021] [Accepted: 01/19/2022] [Indexed: 02/04/2023]
Abstract
Apart from osseointegration, the stability and long‐term survival of percutaneous titanium implants is also strongly dependent on a qualitative soft‐tissue integration in the transcutaneous region. A firm connective tissue seal is needed to minimize soft‐tissue dehiscence and epithelial downgrowth. It is well‐known that the implant surface plays a key role in controlling the biological response of the surrounding keratinized tissue and several coating systems have been suggested to enhance the soft‐tissue cell interactions. Although some promising results have been obtained in vitro, their clinical significance can be debated. Therefore, the purpose of this systematic review is to gain more insight into the effect of such coatings on the interface formed with keratinized soft‐tissue in vivo. A comprehensive search was undertaken in March 2021. Relevant electronic databases were consulted to identify appropriate studies using a set of search strings. In total, 12 out of 4971 publications were included in this review. The reported coating systems were assigned to several subgroups according to their characteristics: metallic, ceramic and composite. Notwithstanding the differences in study characteristics (animal model, implantation period, reported outcomes), it was noticed that several coatings improve the soft‐tissue integration as compared to pristine titanium. Porous titanium coatings having only limited pore sizes (<250 μm) do not support dermal fibroblast tissue attachment. Yet, larger pores (>700 μm) allow extensive vascularized soft‐tissue infiltration, thereby supporting cell attachment. Nanostructured ceramic coatings are found to reduce the inflammatory response in favor of the formation of cell adhesive structures, that is, hemidesmosomes. Biomolecule coatings seem of particular interest to stimulate the soft‐tissue behavior provided that a durable fixation to the implant surface can be ensured. In this respect, fibroblast growth factor‐2 entrapped in a biomimetic apatite coating instigates a close to natural soft‐tissue attachment with epidermal collagen fibers attaching almost perpendicular to the implant surface. However, several studies had limitations with respect to coating characterization and detailed soft‐tissue analysis, small sample size and short implantation periods. To date, robust and long‐term in vivo studies are still lacking. Further investigation is required before a clear consensus on the optimal coating system allowing enhancing the soft‐tissue seal around percutaneous titanium implants can be reached.
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Affiliation(s)
- Casper E Van den Borre
- Doctoral School of Life Sciences and Medicine, Vrije Universiteit Brussel, Brussels, Belgium.,European Face Centre, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Brandaan G R Zigterman
- European Face Centre, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Maurice Y Mommaerts
- European Face Centre, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Annabel Braem
- Department of Materials Engineering, Biomaterials and Tissue Engineering Research Group, KU Leuven, Leuven, Belgium
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Kunrath MF, Gupta S, Lorusso F, Scarano A, Noumbissi S. Oral Tissue Interactions and Cellular Response to Zirconia Implant-Prosthetic Components: A Critical Review. MATERIALS 2021; 14:ma14112825. [PMID: 34070589 PMCID: PMC8198172 DOI: 10.3390/ma14112825] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/15/2021] [Accepted: 05/18/2021] [Indexed: 12/20/2022]
Abstract
Background: Dental components manufactured with zirconia (ZrO2) represent a significant percentage of the implant prosthetic market in dentistry. However, during the last few years, we have observed robust clinical and pre-clinical scientific investigations on zirconia both as a prosthetic and an implantable material. At the same time, we have witnessed consistent technical and manufacturing updates with regards to the applications of zirconia which appear to gradually clarify points which until recently were not well understood. Methods: This critical review evaluated the “state of the art” in relation to applications of this biomaterial in dental components and its interactions with oral tissues. Results: The physico-chemical and structural properties as well as the current surface treatment methodologies for ZrO2 were explored. A critical investigation of the cellular response to this biomaterial was completed and the clinical implications discussed. Finally, surface treatments of ZrO2 demonstrate that excellent osseointegration is possible and provide encouraging prospects for rapid bone adhesion. Furthermore, sophisticated surface treatment techniques and technologies are providing impressive oral soft tissue cell responses thus leading to superior biological seal. Conclusions: Dental devices manufactured from ZrO2 are structurally and chemically stable with biocompatibility levels allowing for safe and long-term function in the oral environment.
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Affiliation(s)
- Marcel F. Kunrath
- Dentistry Department, School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul (PUCRS), P.O. Box 6681, Porto Alegre 90619-900, RS, Brazil;
- Materials and Nanoscience Laboratory, Pontifical Catholic University of Rio Grande do Sul (PUCRS), P.O. Box 6681, Porto Alegre 90619-900, RS, Brazil
| | - Saurabh Gupta
- Zirconia Implant Research Group (Z.I.R.G), International Academy of Ceramic Implantology, Silver Spring, MD 20901, USA; (S.G.); (S.N.)
- Master Dental Science, Universitat Jaume I, 12071 Castellón de la Plana, Spain
| | - Felice Lorusso
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, Via dei Vestini, 31-66100 Chieti, CH, Italy;
| | - Antonio Scarano
- Zirconia Implant Research Group (Z.I.R.G), International Academy of Ceramic Implantology, Silver Spring, MD 20901, USA; (S.G.); (S.N.)
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, Via dei Vestini, 31-66100 Chieti, CH, Italy;
- Correspondence: ; Tel.: +08713554084
| | - Sammy Noumbissi
- Zirconia Implant Research Group (Z.I.R.G), International Academy of Ceramic Implantology, Silver Spring, MD 20901, USA; (S.G.); (S.N.)
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, Via dei Vestini, 31-66100 Chieti, CH, Italy;
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Wei J, Zhang X, Li Y, Ding X, Zhang Y, Jiang X, Lai H, Shi J. Novel application of bergapten and quercetin with anti-bacterial, osteogenesis-potentiating, and anti-inflammation tri-effects. Acta Biochim Biophys Sin (Shanghai) 2021; 53:683-696. [PMID: 33772282 DOI: 10.1093/abbs/gmab037] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Indexed: 01/02/2023] Open
Abstract
The bacteria-mediated inflammatory conditions adversely affect the osseointegration process of endosseous implants, which can even lead to implant malfunction or failure. Local drug delivery has been designed to exert anti-inflammatory and antibacterial activities, but whether this strategy has an effect on the compromised osseointegration under inflammation has rarely been studied. The present study focused on the osteoinductive efficacy of two known phytoestrogens [bergapten (BP) and quercetin (QE)] on implant sites under multiple bacteria-infected conditions in situ. Furthermore, the gene expression profiles of rat bone mesenchymal stem cells (rBMSCs) treated with BP and QE in the presence of Porphyromonas gingivalis-derived lipopolysaccharide were identified. The results showed that both drugs, especially QE, had significant potentiating effects on promoting osteogenic differentiation of rBMSCs, resisting multiple pathogens, and reducing inflammatory activity. Meanwhile, RNA sequencing analysis highlighted the enriched gene ontology terms and the differentially expressed genes (Vps25, Il1r2, Csf3, Efemp1, and Ccl20) that might play essential roles in regulating the above tri-effects, which provided the basis for the drug delivery system to be used as a novel therapeutic strategy for integrating peri-implant health. Overall, our study confirmed that QE appeared to outperform BP in osteogenesis and bacterial killing but not in anti-inflammation. Moreover, both drugs possess favorable tri-effects and can serve as the pivotal agents for the drug delivery system to boost osseointegration at inflammatory implant sites.
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Affiliation(s)
- Jianxu Wei
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Xiaomeng Zhang
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Yuan Li
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Xinxin Ding
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Yi Zhang
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Xue Jiang
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Hongchang Lai
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Junyu Shi
- Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
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6
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Burkhardt F, Harlass M, Adolfsson E, Vach K, Spies BC, Kohal RJ. A Novel Zirconia-Based Composite Presents an Aging Resistant Material for Narrow-Diameter Ceramic Implants. MATERIALS 2021; 14:ma14092151. [PMID: 33922688 PMCID: PMC8122934 DOI: 10.3390/ma14092151] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 01/23/2023]
Abstract
A novel ceria-stabilized zirconia-alumina-aluminate composite (Ce-TZP-comp) that is not prone to aging presents a potential alternative to yttrium-stabilized zirconia for ceramic oral implants. The objective of this study was to evaluate the long-term stability of a one-piece narrow-diameter implant made of Ce-TZP-comp. Implant prototypes with a narrow (3.4 mm) and regular (4.0 mm) diameter were embedded according to ISO 14801, and subgroups (n = 8) were subsequently exposed to dynamic loading (107 cycles, 98N) and/or hydrothermal treatment (aging, 85 °C). Loading/aging was only applied as a combined protocol for the 4.0 mm diameter implants. One subgroup of each diameter remained untreated. One sample was cross-sectioned from each subgroup and evaluated with a scanning electron microscope for phase-transformation of the lattice. Finally, the remaining samples were loaded to fracture. A multivariate linear regression model was applied for statistical analyses (significance at p < 0.05). All samples withstood the different loading/aging protocols and no transformation propagation was observed. The narrow diameter implants showed the lowest fracture load after combined loading/aging (628 ± 56 N; p < 0.01), whereas all other subgroups exhibited no significantly reduced fracture resistance (between 762 ± 62 and 806 ± 73 N; p > 0.05). Therefore, fracture load values of Ce-TZP-comp implants suggest a reliable intraoral clinical application in the anterior jaw regions.
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Affiliation(s)
- Felix Burkhardt
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany; (F.B.); (M.H.); (B.C.S.)
| | - Markus Harlass
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany; (F.B.); (M.H.); (B.C.S.)
| | | | - Kirstin Vach
- Medical Center—University of Freiburg, Institute for Medical Biometry and Statistics, Faculty of Medicine, University of Freiburg, Stefan-Meier-Str. 26, 79104 Freiburg, Germany;
| | - Benedikt Christopher Spies
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany; (F.B.); (M.H.); (B.C.S.)
| | - Ralf-Joachim Kohal
- Medical Center—University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany; (F.B.); (M.H.); (B.C.S.)
- Correspondence:
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Orchestrating soft tissue integration at the transmucosal region of titanium implants. Acta Biomater 2021; 124:33-49. [PMID: 33444803 DOI: 10.1016/j.actbio.2021.01.001] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 01/03/2021] [Accepted: 01/05/2021] [Indexed: 12/20/2022]
Abstract
Osseointegration at the bone-implant interface and soft tissue integration (STI) at the trans-mucosal region are crucial for the long-term success of dental implants, especially in compromised patient conditions. The STI quality of conventional smooth and bio-inert titanium-based implants is inferior to that of natural tissue (i.e. teeth), and hence various surface modifications have been suggested. This review article compares and contrasts the various modification strategies (physical, chemical and biological) utilized to enhance STI of Ti implants. It also details the STI challenges associated with conventional Ti-based implants, current surface modification strategies and cutting-edge nano-engineering solutions. The topographical, biological and therapeutic advances achievable via electrochemically anodized Ti implants with TiO2 nanotubes/nanopores are highlighted. Finally, the status and future directions of such nano-engineered implants is discussed, with emphasis on bridging the gap between research and clinical translation.
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Amler AK, Thomas A, Tüzüner S, Lam T, Geiger MA, Kreuder AE, Palmer C, Nahles S, Lauster R, Kloke L. 3D bioprinting of tissue-specific osteoblasts and endothelial cells to model the human jawbone. Sci Rep 2021; 11:4876. [PMID: 33649412 PMCID: PMC7921109 DOI: 10.1038/s41598-021-84483-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 02/15/2021] [Indexed: 02/06/2023] Open
Abstract
Jawbone differs from other bones in many aspects, including its developmental origin and the occurrence of jawbone-specific diseases like MRONJ (medication-related osteonecrosis of the jaw). Although there is a strong need, adequate in vitro models of this unique environment are sparse to date. While previous approaches are reliant e.g. on scaffolds or spheroid culture, 3D bioprinting enables free-form fabrication of complex living tissue structures. In the present work, production of human jawbone models was realised via projection-based stereolithography. Constructs were bioprinted containing primary jawbone-derived osteoblasts and vasculature-like channel structures optionally harbouring primary endothelial cells. After 28 days of cultivation in growth medium or osteogenic medium, expression of cell type-specific markers was confirmed on both the RNA and protein level, while prints maintained their overall structure. Survival of endothelial cells in the printed channels, co-cultured with osteoblasts in medium without supplementation of endothelial growth factors, was demonstrated. Constructs showed not only mineralisation, being one of the characteristics of osteoblasts, but also hinted at differentiation to an osteocyte phenotype. These results indicate the successful biofabrication of an in vitro model of the human jawbone, which presents key features of this special bone entity and hence appears promising for application in jawbone-specific research.
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Affiliation(s)
- Anna-Klara Amler
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany. .,Department of Medical Biotechnology, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany.
| | - Alexander Thomas
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany.,Department of Medical Biotechnology, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Selin Tüzüner
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany.,Department of Medical Biotechnology, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Tobias Lam
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | | | - Anna-Elisabeth Kreuder
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany.,Department of Medical Biotechnology, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Chris Palmer
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Susanne Nahles
- Department of Oral- and Maxillofacial Surgery, Charité Campus Virchow, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Roland Lauster
- Department of Medical Biotechnology, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Lutz Kloke
- Cellbricks GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
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9
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Li R, Wang C, Ma SQ, Liu ZH, Zang CC, Zhang WY, Sun YC. High bonding strength between zirconia and composite resin based on combined surface treatment for dental restorations. J Appl Biomater Funct Mater 2020; 18:2280800020928655. [PMID: 33147097 DOI: 10.1177/2280800020928655] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Zirconia is the preferred material for dental restorations; however, dental restorations are usually affected by zirconia fractures due to chipping and delamination of the veneer ceramic. One effective solution for repairing chemically inert zirconia frameworks is to strongly chemically bond them with the composite resin via surface modification. Thus, the bonding strength between the zirconia and composite resin determines the performance of dental restoration. Herein, we investigate the shear bond strength between zirconia ceramic and two ceramic repair systems before and after thermal cycling based on different surface pretreatments, including air-abrasion and a novel silane coupling agent. When treated with combined sandblasting, novel silane and 10-methacryloyloxydecyl hydrogen phosphate act as a bonding agent for the zirconia surface, and the maximum shear bond strength achieves 27.5 MPa, as measured by a universal testing machine through the average of 16 separate measurements. The results show that the combined treatment resists the interface damage caused by expansion and contraction during thermal cycling. The long-term bond durability is due to the micro-mechanical bond force formed by resin and ceramic, and the chemical bonds of Zr-O-Si at the interface. Results indicate that selective pretreating the surface results in high bond strength between the zirconia and the composite resin, which is meaningful to optimize dental restoration.
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Affiliation(s)
- Rui Li
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Chen Wang
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Shi Qing Ma
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Zi Hao Liu
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Cheng Cheng Zang
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Wen Yi Zhang
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
| | - Ying Chun Sun
- Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China
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10
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Controlling osteoblast morphology and proliferation via surface micro-topographies of implant biomaterials. Sci Rep 2020; 10:12810. [PMID: 32732908 PMCID: PMC7393177 DOI: 10.1038/s41598-020-69685-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 07/15/2020] [Indexed: 12/20/2022] Open
Abstract
Current research on surface modifications has yielded advanced implant biomaterials. Various implant surface modifications have been shown to be promising in improving bone target cell response, but more comprehensive studies whether certain implant surface modifications can directly target cell behavioural features such as morphogenesis and proliferation are needed. Here, we studied the response of primary alveolar bone cells on various implant surface modifications in terms of osteoblast morphology and proliferation in vitro. Analyses of surface modifications led to surface-related test parameters including the topographical parameters micro-roughness, texture aspect and surface enlargement as well as the physicochemical parameter surface wettability. We compared osteoblast morphology and proliferation towards the above-mentioned parameters and found that texture aspect and surface enlargement but not surface roughness or wettability exhibited significant impact on osteoblast morphology and proliferation. Detailed analysis revealed osteoblast proliferation as a function of cell morphology, substantiated by an osteoblast size- and morphology-dependent increase in mitotic activity. These findings show that implant surface topography controls cell behavioural morphology and subsequently cell proliferation, thereby opening the road for cell instructive biomaterials.
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11
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Han A, Tsoi JKH, Lung CYK, Matinlinna JP. An introduction of biological performance of zirconia with different surface characteristics: A review. Dent Mater J 2020; 39:523-530. [PMID: 32507797 DOI: 10.4012/dmj.2019-200] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Zirconia (ZrO2) ceramic is widely used in dentistry as a clinical dental biomaterial. In this review, we are focusing on and summarizing the biological performance of zirconia under different surface characteristics. We have included an initial tissue cell attachment study on zirconia and bacterial adhesion on zirconia. Our results suggest that surface modifications applied on zirconia may change the interfacial surface characteristics e.g. surface roughness, surface free energy, and chemistry of zirconia. The modifications also result in advanced biological performance of zirconia, including enhanced tissue cell attachment and reduction of bacterial adhesion. The recent laboratory research has provided many interesting modification methods and showed clinically interesting and promising outcomes. A few of the outcomes are validated and have been applied in clinical dentistry.
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Affiliation(s)
- Aifang Han
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong
| | - James K H Tsoi
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong
| | - Christie Y K Lung
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong
| | - Jukka P Matinlinna
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong
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12
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Schünemann FH, Galárraga-Vinueza ME, Magini R, Fredel M, Silva F, Souza JCM, Zhang Y, Henriques B. Zirconia surface modifications for implant dentistry. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:1294-1305. [PMID: 30813009 DOI: 10.1016/j.msec.2019.01.062] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 01/13/2019] [Accepted: 01/14/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Zirconia has emerged as a versatile dental material due to its excellent aesthetic outcomes such as color and opacity, unique mechanical properties that can mimic the appearance of natural teeth and decrease peri-implant inflammatory reactions. OBJECTIVE The aim of this review was to critically explore the state of art of zirconia surface treatment to enhance the biological and osseointegration behavior of zirconia in implant dentistry. MATERIALS AND METHODS An electronic search in PubMed database was carried out until May 2018 using the following combination of key words and MeSH terms without time periods: "zirconia surface treatment" or "zirconia surface modification" or "zirconia coating" and "osseointegration" or "biological properties" or "bioactivity" or "functionally graded properties". RESULTS Previous studies have reported the influence of zirconia-based implant surface on the adhesion, proliferation, and differentiation of osteoblast and fibroblasts at the implant to bone interface during the osseointegration process. A large number of physicochemical methods have been used to change the implant surfaces and therefore to improve the early and late bone-to-implant integration, namely: acid etching, gritblasting, laser treatment, UV light, CVD, and PVD. The development of coatings composed of silica, magnesium, graphene, dopamine, and bioactive molecules has been assessed although the development of a functionally graded material for implants has shown encouraging mechanical and biological behavior. CONCLUSION Modified zirconia surfaces clearly demonstrate faster osseointegration than that on untreated surfaces. However, there is no consensus regarding the surface treatment and consequent morphological aspects of the surfaces to enhance osseointegration.
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Affiliation(s)
- Fernanda H Schünemann
- School of Dentistry (DODT), Post-Graduate Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Campus Trindade, 88040-900 Florianópolis, SC, Brazil
| | - María E Galárraga-Vinueza
- School of Dentistry (DODT), Post-Graduate Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Campus Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Ricardo Magini
- School of Dentistry (DODT), Post-Graduate Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Campus Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Márcio Fredel
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Campus Trindade, 88040-900, Florianópolis, SC, Brazil
| | - Filipe Silva
- CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
| | - Júlio C M Souza
- CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; Department of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, 4585-116, Gandra, Portugal
| | - Yu Zhang
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, NYU, New York, NY 10010, USA
| | - Bruno Henriques
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Campus Trindade, 88040-900, Florianópolis, SC, Brazil; CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
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13
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Jung S, Bohner L, Hanisch M, Kleinheinz J, Sielker S. Influence of Implant Material and Surface on Differentiation and Proliferation of Human Adipose-Derived Stromal Cells. Int J Mol Sci 2018; 19:ijms19124033. [PMID: 30551618 PMCID: PMC6321152 DOI: 10.3390/ijms19124033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 12/05/2018] [Accepted: 12/12/2018] [Indexed: 12/15/2022] Open
Abstract
For the guided regeneration of periimplant hard and soft tissues, human adipose-derived stromal cells (hADSC) seem to be a promising source for mesenchymal stromal cells. For this, the proliferation and differentiation of hADSC were evaluated on titanium and zirconia dental implants with different surface treatments. Results were compared to edaphic cells as human osteoblasts (hOB) and human gingival fibroblasts (HGF). Primary cells were cultured on (1) titanium implants with a polished surface (Ti-PT), (2) sandblasted and acid-etched titanium (Ti-SLA), (3) sandblasted and alkaline etched zirconia (ZrO2-ZLA) and (4) machined zirconia (ZrO2-M). The cell proliferation and differentiation on osteogenic lineage were assessed after 1, 7 and 14 days. Statistical analysis was performed by one-way ANOVA and a modified Levene test with a statistical significance at p = 0.05. PostHoc tests were performed by Bonferroni-Holm. Zirconia dental implants with rough surface (ZrO2-ZLA) showed the highest proliferation rates (p = 0.048). The osteogenic differentiation occurred early for zirconia and later for titanium implants, and it was enhanced for rough surfaces in comparison to polished/machined surfaces. Zirconia was more effective to promote the proliferation and differentiation of hADSCs in comparison to titanium. Rough surfaces were able to improve the biological response for both zirconia and titanium.
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Affiliation(s)
- Susanne Jung
- Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral Structures (VABOS), University Hospital Muenster, 48149 Muenster, Germany.
| | - Lauren Bohner
- Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral Structures (VABOS), University Hospital Muenster, 48149 Muenster, Germany.
| | - Marcel Hanisch
- Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral Structures (VABOS), University Hospital Muenster, 48149 Muenster, Germany.
| | - Johannes Kleinheinz
- Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral Structures (VABOS), University Hospital Muenster, 48149 Muenster, Germany.
| | - Sonja Sielker
- Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral Structures (VABOS), University Hospital Muenster, 48149 Muenster, Germany.
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Kozelskaya AI, Bolbasov EN, Golovkin AS, Mishanin AI, Viknianshchuk AN, Shesterikov EV, Ashrafov А, Novikov VA, Fedotkin AY, Khlusov IA, Tverdokhlebov SI. Modification of the Ceramic Implant Surfaces from Zirconia by the Magnetron Sputtering of Different Calcium Phosphate Targets: A Comparative Study. MATERIALS 2018; 11:ma11101949. [PMID: 30314394 PMCID: PMC6213365 DOI: 10.3390/ma11101949] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 10/06/2018] [Accepted: 10/08/2018] [Indexed: 01/22/2023]
Abstract
In this study, thin calcium phosphate (Ca-P) coatings were deposited on zirconia substrates by radiofrequency (RF) magnetron sputtering using different calcium phosphate targets (calcium phosphate tribasic (CPT), hydroxyapatite (HA), calcium phosphate monobasic, calcium phosphate dibasic dehydrate (DCPD) and calcium pyrophosphate (CPP) powders). The sputtering of calcium phosphate monobasic and DCPD powders was carried out without an inert gas in the self-sustaining plasma mode. The physico-chemical, mechanical and biological properties of the coatings were investigated. Cell adhesion on the coatings was examined using mesenchymal stem cells (MSCs). The CPT coating exhibited the best cell adherence among all the samples, including the uncoated zirconia substrate. The cells were spread uniformly over the surfaces of all samples.
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Affiliation(s)
- Anna I Kozelskaya
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
| | - Evgeny N Bolbasov
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
| | - Alexey S Golovkin
- Institution of molecular biology and genetics, Almazov National Medical Research Centre, 197341 Saint Petersburg, Russia.
| | - Alexander I Mishanin
- Institution of molecular biology and genetics, Almazov National Medical Research Centre, 197341 Saint Petersburg, Russia.
| | - Alice N Viknianshchuk
- Institution of molecular biology and genetics, Almazov National Medical Research Centre, 197341 Saint Petersburg, Russia.
| | - Evgeny V Shesterikov
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
- Laboratory of Lidar Methods, V.E. Zuev Institute of Atmospheric Optics SB RAS, 634055 Tomsk, Russia.
| | - Аndrey Ashrafov
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
| | - Vadim A Novikov
- Faculty of Physics, Department of Semiconductor Physics, Tomsk State University, 634050 Tomsk, Russia.
| | - Alexander Y Fedotkin
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
| | - Igor A Khlusov
- Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 634050 Tomsk, Russia.
- Department of Morphology and General Pathology, Siberian State Medical University, 634050 Tomsk, Russia.
- Institute of Living Systems, Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia.
| | - Sergey I Tverdokhlebov
- Laboratory for Plasma Hybrid Systems, The Weinberg Research Center, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia.
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15
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Souza L, Lopes JH, Encarnação D, Mazali IO, Martin RA, Camilli JA, Bertran CA. Comprehensive in vitro and in vivo studies of novel melt-derived Nb-substituted 45S5 bioglass reveal its enhanced bioactive properties for bone healing. Sci Rep 2018; 8:12808. [PMID: 30143690 PMCID: PMC6109119 DOI: 10.1038/s41598-018-31114-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 08/02/2018] [Indexed: 12/15/2022] Open
Abstract
The present work presents and discusses the results of a comprehensive study on the bioactive properties of Nb-substituted silicate glass derived from 45S5 bioglass. In vitro and in vivo experiments were performed. We undertook three different types of in vitro analyses: (i) investigation of the kinetics of chemical reactivity and the bioactivity of Nb-substituted glass in simulated body fluid (SBF) by 31P MASNMR spectroscopy, (ii) determination of ionic leaching profiles in buffered solution by inductively coupled plasma optical emission spectrometry (ICP-OES), and (iii) assessment of the compatibility and osteogenic differentiation of human embryonic stem cells (hESCs) treated with dissolution products of different compositions of Nb-substituted glass. The results revealed that Nb-substituted glass is not toxic to hESCs. Moreover, adding up to 1.3 mol% of Nb2O5 to 45S5 bioglass significantly enhanced its osteogenic capacity. For the in vivo experiments, trial glass rods were implanted into circular defects in rat tibia in order to evaluate their biocompatibility and bioactivity. Results showed all Nb-containing glass was biocompatible and that the addition of 1.3 mol% of Nb2O5, replacing phosphorous, increases the osteostimulation of bioglass. Therefore, these results support the assertion that Nb-substituted glass is suitable for biomedical applications.
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Affiliation(s)
- Lucas Souza
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas - UNICAMP, 13083-862, Campinas, SP, Brazil
| | - João Henrique Lopes
- Department of Physical Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
| | - Davi Encarnação
- Department of Physical Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil
| | - Italo Odone Mazali
- Laboratory of Functional Materials, Department of Inorganic Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil
| | - Richard Alan Martin
- School of Engineering & Aston Research Centre for Healthy Ageing, Aston University, B47ET, Birmingham, United Kingdom
| | - José Angelo Camilli
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas - UNICAMP, 13083-862, Campinas, SP, Brazil
| | - Celso Aparecido Bertran
- Department of Physical Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil
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Rezaei NM, Hasegawa M, Ishijima M, Nakhaei K, Okubo T, Taniyama T, Ghassemi A, Tahsili T, Park W, Hirota M, Ogawa T. Biological and osseointegration capabilities of hierarchically (meso-/micro-/nano-scale) roughened zirconia. Int J Nanomedicine 2018; 13:3381-3395. [PMID: 29922058 PMCID: PMC5997135 DOI: 10.2147/ijn.s159955] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
PURPOSE Zirconia is a potential alternative to titanium for dental and orthopedic implants. Here we report the biological and bone integration capabilities of a new zirconia surface with distinct morphology at the meso-, micro-, and nano-scales. METHODS Machine-smooth and roughened zirconia disks were prepared from yttria-stabilized tetragonal zirconia polycrystal (Y-TZP), with rough zirconia created by solid-state laser sculpting. Morphology of the surfaces was analyzed by three-dimensional imaging and profiling. Rat femur-derived bone marrow cells were cultured on zirconia disks. Zirconia implants were placed in rat femurs and the strength of osseointegration was evaluated by biomechanical push-in test. RESULTS The rough zirconia surface was characterized by meso-scale (50 µm wide, 6-8 µm deep) grooves, micro-scale (1-10 µm wide, 0.1-3 µm deep) valleys, and nano-scale (10-400 nm wide, 10-300 nm high) nodules, whereas the machined surface was flat and uniform. The average roughness (Ra) of rough zirconia was five times greater than that of machined zirconia. The expression of bone-related genes such as collagen I, osteopontin, osteocalcin, and BMP-2 was 7-25 times upregulated in osteoblasts on rough zirconia at the early stage of culture. The number of attached cells and rate of proliferation were similar between machined and rough zirconia. The strength of osseointegration for rough zirconia was twice that of machined zirconia at weeks two and four of healing, with evidence of mineralized tissue persisting around rough zirconia implants as visualized by electron microscopy and elemental analysis. CONCLUSION This unique meso-/micro-/nano-scale rough zirconia showed a remarkable increase in osseointegration compared to machine-smooth zirconia associated with accelerated differentiation of osteoblasts. Cell attachment and proliferation were not compromised on rough zirconia unlike on rough titanium. This is the first report introducing a rough zirconia surface with distinct hierarchical morphology and providing an effective strategy to improve and develop zirconia implants.
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Affiliation(s)
- Naser Mohammadzadeh Rezaei
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Masakazu Hasegawa
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Manabu Ishijima
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Kourosh Nakhaei
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Takahisa Okubo
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Takashi Taniyama
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Amirreza Ghassemi
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Tania Tahsili
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Wonhee Park
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Makoto Hirota
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Takahiro Ogawa
- Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
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Murakami T, Takemoto S, Nishiyama N, Aida M. Zirconia surface modification by a novel zirconia bonding system and its adhesion mechanism. Dent Mater 2017; 33:1371-1380. [PMID: 29050817 DOI: 10.1016/j.dental.2017.09.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 08/08/2017] [Accepted: 09/07/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Takahiro Murakami
- Nihon University Graduate School of Dentistry at Matsudo, Crown Bridge Prosthodontics, Chiba 271-8587, Japan; Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan
| | - Shinji Takemoto
- Department of Biomedical Engineering, Iwate Medical University, Iwate 028-3694, Japan
| | - Norihiro Nishiyama
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan
| | - Masahiro Aida
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan.
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