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Yang F, Liu D, Yin W, Yuan C, Hu Y, Xu J, Yang Y, Tang J, Chen J. Three-dimensional finite element analysis of the biomechanical behaviour of different dental implants under immediate loading during three masticatory cycles. Heliyon 2024; 10:e32616. [PMID: 38961961 PMCID: PMC11219977 DOI: 10.1016/j.heliyon.2024.e32616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 06/05/2024] [Accepted: 06/06/2024] [Indexed: 07/05/2024] Open
Abstract
The study aimed to evaluate the impact of varying modulus of elasticity (MOE) values of dental implants on the deformation and von Mises stress distribution in implant systems and peri-implant bone tissues under dynamic cyclic loading. The implant-bone interface was characterised as frictional contact, and the initial stress was induced using the interference fit method to effectively develop a finite element model for an immediately loaded implant-supported denture. Using the Ansys Workbench 2021 R2 software, an analysis was conducted to examine the deformation and von Mises stress experienced by the implant-supported dentures, peri-implant bone tissue, and implants under dynamic loading across three simulated masticatory cycles. These findings were subsequently evaluated through a comparative analysis. The suprastructures showed varying degrees of maximum deformation across zirconia (Zr), titanium (Ti), low-MOE-Ti, and polyetheretherketone (PEEK) implant systems, registering values of 103.1 μm, 125.68 μm, 169.52 μm, and 844.06 μm, respectively. The Zr implant system demonstrated the lowest values for both maximum deformation and von Mises stress (14.96 μm, 86.71 MPa) in cortical bone. As the MOE increased, the maximum deformation in cancellous bone decreased. The PEEK implant system exhibited the highest maximum von Mises stress (59.12 MPa), whereas the Ti implant system exhibited the lowest stress (22.48 MPa). Elevating the MOE resulted in reductions in both maximum deformation and maximum von Mises stress experienced by the implant. Based on this research, adjusting the MOE of the implant emerged as a viable approach to effectively modify the biomechanical characteristics of the implant system. The Zr implant system demonstrated the least maximum von Mises stress and deformation, presenting a more favourable quality for preserving the stability of the implant-bone interface under immediate loading.
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Affiliation(s)
- Feng Yang
- School and Hospital of Stomatology, Fujian Medical University, Fujian, China
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
- Department of Stomatology, The Affiliated Hospital of Xuzhou Medical University, Jiangsu, China
| | - Dianbin Liu
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Wenjie Yin
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Changyong Yuan
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Yiming Hu
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Jiaqi Xu
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Yunfan Yang
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Jianteng Tang
- School of Stomatology, Xuzhou Medical University, Jiangsu, China
| | - Jiang Chen
- School and Hospital of Stomatology, Fujian Medical University, Fujian, China
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Martinello PA, Cartagena-Molina AF, Capelletti LK, Fernandes BV, Franco APGDO, Mercuri EGF, Bombarda NHC. Adding mechanobiological cell features to finite element analysis of an immediately loaded dental implant. Eur J Oral Sci 2024:e12992. [PMID: 38771146 DOI: 10.1111/eos.12992] [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: 01/19/2024] [Accepted: 04/25/2024] [Indexed: 05/22/2024]
Abstract
Finite element analysis (FEA) has been used to analyze the behavior of dental materials, mainly in implantology. However, FEA is a mechanical analysis and few studies have tried to simulate the biological characteristics of the healing process of loaded implants. This study used the rule of mixtures to simulate the biological healing process of immediate implants in an alveolus socket and bone-implant junction interface through FEA. Three-dimensional geometric models of the structures were obtained, and material properties were derived from the literature. The rule of mixtures was used to simulate the healing periods-immediate and early loading, in which the concentration of each cell type, based on in vivo studies, influenced the final elastic moduli. A 100 N occlusal load was simulated in axial and oblique directions. The models were evaluated for maximum and minimum principal strains, and the bone overload was assessed through Frost's mechanostat. There was a higher strain concentration in the healing regions and cortical bone tissue near the cervical portion. The bone overload was higher in the immediate load condition. The method used in this study may help to simulate the biological healing process and could be useful to relate FEA results to clinical practice.
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Affiliation(s)
| | - Andrés Felipe Cartagena-Molina
- Department of Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil
- Department of Dentistry, State University of Londrina, Londrina, Paraná, Brazil
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Yoon Y, Kang I, Noh G, Kwon YD. Biomechanical analysis of alveolar bones with compromised quality supporting a 4-unit implant bridge; a possible association with implant-related sequestration (IRS). Clin Oral Investig 2024; 28:197. [PMID: 38448748 DOI: 10.1007/s00784-024-05589-3] [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: 12/21/2023] [Accepted: 02/25/2024] [Indexed: 03/08/2024]
Abstract
OBJECTIVES This study aimed to investigate the strain in the bone surrounding dental implants supporting a 4-unit bridge and assess the role of excessive strain as a possible risk factor for implant related sequestration (IRS) or peri-implant medication-related osteonecrosis of the jaw (PI-MRONJ). MATERIALS AND METHODS A 3D-mandibular model was constructed using computed tomography and segmented it into cortical and cancellous bones. The 4-unit implant-supported bridges replacing the mandibular posteriors were constructed, and each featuring two, three, and four implants, respectively. The Young's modulus was assigned based on the quality of the bone. A maximum occlusal force of 200 N was applied to each implant in the axial and in a 30-degree oblique direction. RESULTS The maximum principal strain of the fatigue failure range (> 3000 µε) in the bone was analyzed. The volume fraction of fatigue failure was higher in poor-quality bone compared to normal bone and oblique load than in axial load. An increasing number of implants may dissipate excessive strain in poor-quality bones. CONCLUSIONS Occlusal force applied to poor-quality bone can result in microdamage. Given that unrepaired microdamage may initiate medication-related osteonecrosis of the jaw, long-term occlusal force on fragile bones might be a risk factor. CLINICAL RELEVANCE When planning implant treatment for patients with compromised bone status, clinical modifications such as strategic placement of implants and optimization of restoration morphology should be considered to reduce excessive strain which might be associated with IRS or PI-MRONJ.
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Affiliation(s)
- Youngjae Yoon
- Department of Oral and Maxillofacial Surgery, College of Dentistry, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea
| | - Inyeong Kang
- School of Mechanical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Gunwoo Noh
- School of Mechanical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Yong-Dae Kwon
- Department of Oral and Maxillofacial Surgery, College of Dentistry, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea.
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Sahoo NR, Sahany SK, Pandey V, Das AC, Choudhury P, Panda S, Sahoo R. Finite Element Analysis of the Influence of Implant Tilting and the Direction of Loading on the Displacement and Micromotion of Immediately Loaded Implants. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2024; 16:S924-S926. [PMID: 38595403 PMCID: PMC11000944 DOI: 10.4103/jpbs.jpbs_1103_23] [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: 09/25/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 04/11/2024] Open
Abstract
Objectives To investigate the outcome of the loading direction and implant tilting on the micromotion and displacement of immediately placed implants with finite element analysis (FEA). Materials and Method Eight blocks of synthetic bone were created. Eight screw-type implants were inserted, four axially and four slanted, each measuring 11 mm in length and 4.5 mm in diameter. The axial implants and the tilted implants were distally inclined by 30°. The top of the abutment was subjected to 180 N vertical and mesiodistal oblique (45° angle) loads, and the displacement of the abutment was measured. The abutment displacement and micromotion were estimated, and nonlinear finite element models simulating the in vitro experiment were built. In vitro studies and FEA data on abutment displacement were compared, and the reliability of the finite element model was assessed. Result Under oblique stress, abutment displacement was larger than under axial loading, and it was also greater for tilted implants than for axial implants. The consistency of the in vitro and FEA data was satisfactory. Under vertical stress, the highest micromotion values in the axial and tilted implants were extremely near. Conclusion Under mesiodistal oblique stress, tilted implants may have a smaller maximum amount of micromotion than axial implants. The loading direction had a significant impact on the highest micromotion values. The abutment displacement values were not reflected in the maximum micromotion measurements.
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Affiliation(s)
- Nihar Ranjan Sahoo
- Associate Professor, Department of Dentistry, MKCG Medical College and Hospital, Berhampur, Odisha, India
| | - Subrat Kumar Sahany
- Assistant Professor, Department of Dental Surgery, M.K.C.G. Medical College & Hospital, Brahmapur, Odisha, India
| | - Vijayendra Pandey
- Professor and HOD, Department of Dentistry, Manipal Tata Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Abhaya Chandra Das
- Professor, Department of Periodontics and Oral Implantology, Institute of Dental Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Khandagiri Square, Bhubaneswar, Odisha, India
| | - Purobi Choudhury
- Professor Department of Dentistry, Silchar Medical College and Hospital, Attached faculty of Government Dental College, Silchar, Assam, India
- Department of Periodontics, SrimantaSankardeva University of Health Science’s, Assam, India
| | - Saurav Panda
- Professor, Department of Periodontics and Oral Implantology, Institute of Dental Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Khandagiri Square, Bhubaneswar, Odisha, India
| | - Rashmita Sahoo
- Tutor, Dept of Oral Medicine and Radiology, Institute of Dental Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Khandagiri Square, Bhubaneswar, Odisha, India
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Schmidt A, Berschin C, Wöstmann B, Schlenz MA. Chairside 3-D printed impression trays: a new approach to increase the accuracy of conventional implant impression taking? An in vitro study. Int J Implant Dent 2023; 9:47. [PMID: 38052992 DOI: 10.1186/s40729-023-00516-9] [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: 07/26/2023] [Accepted: 11/21/2023] [Indexed: 12/07/2023] Open
Abstract
PURPOSE A high transfer accuracy of the intraoral implant position to a model is required, to manufacture implant-supported restorations. However, clinically relevant deviations persist between the intraoral implant position and the model obtained, even for the benchmark conventional custom implant impressions with polyether. Thus, new approaches using 3-D printed impression trays may increase the transfer accuracy of implant impressions. The ability to adjust parameters such as the thickness of the layers and the influence of the openings in the impression tray could potentially affect accuracy. METHODS Four different types of impression trays (n = 10 for each group) for the conventional impression technique were investigated: conventional custom impression tray, customized foil tray, chairside 3-D printed impression tray with the SHERA system, and the Primeprint system using an implant master model with four implants in the posterior region and a reference cube. After plaster model casting, all models were measured using a coordinate measuring machine, and the deviation from the reference dataset was determined. A statistical ANOVA analysis was performed (p < 0.05). RESULTS Chairside 3-D printed impression trays showed the best results, followed by conventional custom impression trays. Implant impressions obtained using a customized foil tray exhibited the lowest accuracy. Statistically significant differences were observed between 3-D printed impression trays and conventional custom impression and customized foil trays (p < 0.05). Whereas, the implant position did not have any significant influence on accuracy (p > 0.05). CONCLUSIONS Chairside 3-D printed impression trays significantly increase the transfer accuracy for implant impression taking.
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Affiliation(s)
- Alexander Schmidt
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
| | - Cara Berschin
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
| | - Bernd Wöstmann
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
| | - Maximiliane Amelie Schlenz
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany.
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Zhang W, Fu W, Wang X, Ye J. Improving the osseointegration and soft tissue sealing of zirconia ceramics by the incorporation of akermanite via sol infiltration for dental implants. J Mater Chem B 2023; 11:4237-4259. [PMID: 37115523 DOI: 10.1039/d3tb00190c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Zirconia ceramics are promising dental implant materials due to their high-grade biocompatibility, high mechanical strength, and distinctive aesthetic appearance. Nevertheless, zirconia ceramics are bio-inert with a lack of osseointegration and soft tissue sealing, which limits dental implant applications. As such, the fabrication of zirconia ceramics with high mechanical strength, excellent osseointegration and soft tissue sealing performance remains a great challenge in the dental restoration field. In this article, a novel zirconia ceramic with akermanite (AKT) modification by the negative pressure infiltration method is presented. The effects of AKT sol infiltration at different times on the morphology, phase composition, mechanical properties, bioactivity, osseointegration and soft tissue sealing of the modified zirconia ceramics have been systematically investigated. The modified zirconia ceramics feature excellent mechanical properties and significantly improved surface roughness, hydrophilia, and apatite mineralization ability as compared with unmodified zirconia ceramics. Furthermore, cell-culture experiment results indicated that the surface modification of zirconia ceramics could promote adhesion, spreading, migration, proliferation and osteogenic differentiation of mouse bone marrow stromal stem cells (mBMSCs), as well as the early adhesion, spreading, proliferation and fibroblast differentiation of human gingival fibroblasts (HGFs) in vitro. The prepared bioactive zirconia distinctively enhanced the alkaline phosphate (ALP) activity, osteogenesis-related gene expression of mBMSCs and fibroblast-related-gene expression of HGFs. The in vivo evaluation confirmed that 15-TZP ceramics could promote bone-implant osseointegration to the greatest extent as compared with pure zirconia ceramics. To conclude, our research has shown that AKT-modified zirconia ceramics can achieve bone integration and soft tissue sealing, indicating that they have a lot of potential for application as a novel dental implant material in the clinical setting.
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Affiliation(s)
- Wenmin Zhang
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
| | - Wenhao Fu
- School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Xiaolan Wang
- Medical Research Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
| | - Jiandong Ye
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials of Ministry of Education, South China University of Technology, Guangzhou 510641, China
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Yang Y, Liu Y, Yuan X, Ren M, Chen X, Luo L, Zheng L, Liu Y. Three-dimensional finite element analysis of stress distribution on short implants with different bone conditions and osseointegration rates. BMC Oral Health 2023; 23:220. [PMID: 37061667 PMCID: PMC10105927 DOI: 10.1186/s12903-023-02945-9] [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: 12/15/2022] [Accepted: 04/05/2023] [Indexed: 04/17/2023] Open
Abstract
OBJECTIVE This experiment aimed to investigate the effects of bone conditions and osseointegration rates on the stress distribution of short implants using finite element analysis and also to provide some reference for the application of short implants from a biomechanical prospect. MATERIALS AND METHODS Anisotropic jaw bone models with three bone conditions and 4.1 × 6 mm implant models were created, and four osseointegration rates were simulated. Stress and strain for the implants and jaws were calculated during vertical or oblique loading. RESULTS The cortical bone area around the implant neck was most stressed. The maximum von Mises stress in cortical bone increased with bone deterioration and osseointegration rate, with maximum values of 144.32 MPa and 203.94 MPa for vertical and inclined loading, respectively. The osseointegration rate had the greatest effect on the maximum principal stress in cortical bone of type III bone, with its value increasing by 63.8% at a 100% osseointegration rate versus a 25% osseointegration rate. The maximum and minimum principal stresses under inclined load are 1.3 ~ 1.7 and 1.4 ~ 1.8 times, respectively, those under vertical load. The stress on the jaw bone did not exceed the threshold when the osseointegration rate was ≥ 50% for Type II and 100% for Type III. High strain zones are found in cancellous bone, and the maximum strain increases as the bone condition deteriorate and the rate of osseointegration decreases. CONCLUSIONS The maximum stress in the jaw bone increases as the bone condition deteriorates and the osseointegration rate increases. Increased osseointegration rate reduces cancellous bone strain and improves implant stability without exceeding the yield strength of the cortical bone. When the bone condition is good, and the osseointegration ratio is relatively high, 6 mm short implants can be used. In clinical practice, incline loading is an unfavorable loading condition, and axial loading should be used as much as possible.
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Affiliation(s)
- Yunhe Yang
- Graduate School of Dalian Medical University, Dalian, China
| | - Yuchen Liu
- Department of Engineering Mechanics, Dalian University of Technology, Dalian, China
| | - Xi Yuan
- Graduate School of Dalian University, Dalian, China
| | - Mingfa Ren
- Department of Engineering Mechanics, Dalian University of Technology, Dalian, China
- State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China
| | - Xiaodong Chen
- Department of Prosthodontics, Dalian Stomatological Hospital, Dalian, 116021, China
| | - Lailong Luo
- Department of Engineering Mechanics, Dalian University of Technology, Dalian, China
| | - Lang Zheng
- Graduate School of Dalian University, Dalian, China
| | - Yang Liu
- Department of Prosthodontics, Dalian Stomatological Hospital, Dalian, 116021, China.
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Yang Z, Zhang J, Xu Z, Liu X, Yang J, Tan J. Biomechanical evaluation of custom-made short implants with wing retention applied in severe atrophic maxillary posterior region restoration: A three-dimensional finite element analysis. Front Bioeng Biotechnol 2023; 11:1137779. [PMID: 36845197 PMCID: PMC9948400 DOI: 10.3389/fbioe.2023.1137779] [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: 01/04/2023] [Accepted: 01/25/2023] [Indexed: 02/11/2023] Open
Abstract
Severe bone atrophy in the maxillary posterior region poses a big challenge to implant restoration. Digitally designed and customized short implants with wing retention provide a safer and minimally invasive implant restoration scheme in such circumstances. Small titanium wings are integrated with the short implant supporting the prosthesis. Using digital designing and processing technology, the wings fixed by titanium screws can be flexibly designed, providing the main fixation. The design of the wings will influence the stress distribution and implant stability. This study analyzes the position, structure, and spread area of the wings fixture scientifically by means of three-dimensional finite element analysis. The design of the wings is set to linear, triangular, and planar styles. Under the simulated vertical and oblique occlusal forces, the implant displacement and stress between the implant and the bone surface are analyzed at different bone heights of 1 mm, 2 mm, and 3 mm. The finite element results show that the planar form can better disperse the stress. By adjusting the cusp slope to reduce the influence of lateral force, short implants with planar wing fixtures can be used safely even if the residual bone height is only 1 mm. The results of the study provide a scientific basis for the clinical application of this new customized implant.
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Affiliation(s)
- Zhen Yang
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China,Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China
| | - Jingran Zhang
- Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China,Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Zexian Xu
- Department of Oral and Maxillofacial Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China,School of Stomatology of Qingdao University, Qingdao, China
| | - Xiaoqiang Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China,Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China
| | - Jianjun Yang
- Department of Oral and Maxillofacial Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China,School of Stomatology of Qingdao University, Qingdao, China,*Correspondence: Jianjun Yang, ; Jianguo Tan,
| | - Jianguo Tan
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China,Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China,*Correspondence: Jianjun Yang, ; Jianguo Tan,
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Zupancic Cepic L, Frank M, Reisinger AG, Sagl B, Pahr DH, Zechner W, Schedle A. Experimental validation of a micro-CT finite element model of a human cadaveric mandible rehabilitated with short-implant-supported partial dentures. J Mech Behav Biomed Mater 2021; 126:105033. [PMID: 34933158 DOI: 10.1016/j.jmbbm.2021.105033] [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] [Received: 10/03/2021] [Revised: 11/30/2021] [Accepted: 12/06/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE This study aimed to address the predictive value of a micro-computed tomography (μCT)-based finite element (μFE) model of a human cadaveric edentulous posterior mandible, rehabilitated by short dental implants. Hereby, three different prosthetic/implant configurations of fixed partial dentures ("Sp"-3 splinted crowns on 3 implants, "Br" - Bridge: 3 splinted crowns on 2 implants, and "Si"- 3 single crowns) were analysed by comparing the computational predictions of the global stiffness with experimental data. METHODS Experimental displacement of the bone/implant/prosthesis system was measured under axial and oblique loads of 100 N using an optical deformation system (GOM Aramis) and the overall movement of the testing machine (Zwick Z030). Together with the measured machine force, an "Aramis" (optical markers) and "Zwick" (test machine) stiffness were calculated. FE models were created based on μCT-scans of the cadaveric mandible sample (n = 1) before and after implantation and using stl-files of the crowns. The same load tests and boundary conditions were simulated on the models and the μFE-results were compared to experimental data using linear regression analysis. RESULTS The regression line through a plot of pooled stiffness values (N/mm) for the optical displacement recording (true local displacement) and the test machine (machine compliance included) had a slope of 0.57 and a correlation coefficient R2 of 0.82. The average pooled correlation of global stiffness between the experiment and FE-analysis (FEA) showed a R2 of 0.80, but the FEA-stiffness was 7.2 times higher. The factor was highly dependent on the test configuration. Sp-configuration showed the largest stiffness followed by Br-configuration (17% difference in experiment and 21% in FEA). CONCLUSIONS The current study showed good qualitative agreement between the experimental and predicted global stiffness of different short implant configurations. It could be deduced that 1:1 splinting of the short implants by the crowns is most favorable for the stiffness of the implant/prosthesis system. However, in the clinical context, the absolute in silico readings must be interpreted cautiously, as the FEA showed a considerable overestimation of the values.
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Affiliation(s)
- Lana Zupancic Cepic
- Department of Prosthodontics, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Martin Frank
- Institute of Lightweight Design and Structural Biomechanics, TU Wien, 1090, Vienna, Austria
| | - Andreas G Reisinger
- Institute of Lightweight Design and Structural Biomechanics, TU Wien, 1090, Vienna, Austria; Department of Anatomy und Biomechanics, Division Biomechanics, Karl Landsteiner University of Health Sciences, 3500, Krems, Austria
| | - Benedikt Sagl
- Center of Clinical Research, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Dieter H Pahr
- Department of Anatomy und Biomechanics, Division Biomechanics, Karl Landsteiner University of Health Sciences, 3500, Krems, Austria.
| | - Werner Zechner
- Department of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Andreas Schedle
- Competence Center for Dental Materials, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
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Tobar-Reyes J, Andueza-Castro L, Jiménez-Silva A, Bustamante-Plaza R, Carvajal-Herrera J. Micromotion analysis of immediately loaded implants with Titanium and Cobalt-Chrome superstructures. 3D finite element analysis. Clin Exp Dent Res 2021; 7:581-590. [PMID: 34042328 PMCID: PMC8404496 DOI: 10.1002/cre2.365] [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: 05/23/2020] [Revised: 10/27/2020] [Accepted: 10/31/2020] [Indexed: 11/26/2022] Open
Abstract
Objective The aim of this study was to evaluate the amount of micromotion of dental implants under immediate loading supported by Titanium (Ti) and Cobalt‐Chrome (Co‐Cr) superstructures. Material and methods A model of tridimensional half‐edentulous maxilla with three dental implants was made using the Finite Element Analysis (FEA). Two standard and one zygomatic implants were connected to a superstructure with an elliptic section of 6x 3 mm (mm). Two study models were established. Model A: Titanium (Ti) alloy superstructure; Model B: Cobalt‐Chrome (Co‐Cr) alloy superstructure. To simulate an immediate‐loading situation, a friction coefficient of 0.71 was applied between the implant and the bone surface. An axial load of 252.04 [N] was applied on standard and zygomatic implants. Results The Micromotion of dental implants was similar in both superstructure situations. The amount of micromotion was slightly higher in B1 and B3 models (Co‐Cr alloy‐superstructure) compared with A1 and A3 models (Titanium alloy superstructure). The micromotion values in two groups were greater than 150 μm in the incisive region (standard implant) and molar region (zygomatic). In general, the micromotion was higher on the implant that received the load with respect to the other implants. The greater difference was observed when the load was applied on the standard implant A1 (Model A1 = 189.12 μm) compared with standard implant B1(Model B1 = 263.25 μm). Conclusions Within the limits of present study, all implants on different load application points showed micromotion; in general, the amount of micromotion was slightly higher in the implants connected with Co‐Cr alloy superstructure.
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Affiliation(s)
- Julio Tobar-Reyes
- Department of Oral Rehabilitation, Faculty of Dentistry, University of Chile, Santiago, Chile
| | - Luis Andueza-Castro
- Facultad de Diseño, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Antonio Jiménez-Silva
- Orthodontic and Orthopaedic Department, Faculty of Dentistry, Universidad Andrés Bello, Santiago, Chile
| | | | - Juan Carvajal-Herrera
- Department of Oral Rehabilitation, Faculty of Dentistry, University of Chile, Santiago, Chile
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11
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Schmidt A, Rein PE, Wöstmann B, Schlenz MA. A comparative clinical study on the transfer accuracy of conventional and digital implant impressions using a new reference key-based method. Clin Oral Implants Res 2021; 32:460-469. [PMID: 33469983 DOI: 10.1111/clr.13715] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 01/10/2021] [Accepted: 01/13/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVES The objective of this study was to systematically compare the transfer accuracy of conventional and digital implant impressions in patients using a new reference key-based method. MATERIAL AND METHODS Thirty-nine cases were included in the study (upper jaw 22 edentulous, 8 partially edentulous, average distance between implants 30.15 ± 11.18 mm; lower jaw 6 cases edentulous, 3 cases partially edentulous, average distance between implants 33.19 ± 14.85 mm). Individual reference keys were manufactured and reversibly fixed on implants. A conventional (CVI) and a digital (DI) implant impression was made. The implant positions (center points) of conventional and digital models were measured (coordinate-measuring machine/three-dimensional analysis software) and superimposed with the positions of the reference keys to compare the deviations of the conventional and digital models. For statistical analysis, ANOVA with MIXED procedure was applied (p < .05). RESULTS Mean deviation ranged from 0.040±0.029 mm (DI/upper jaw) to 0.079 ± 0.050 mm (DI/lower jaw). There were significant differences between the CVI and DI impressions in the lower jaw (p < .05). No significant differences in transfer accuracy were found between partially and completely edentulous patients for the impression methods. CONCLUSIONS Within the limits of the present study, it can be concluded that full-arch digital implant impressions of the upper jaw in partially or completely edentulous patients showed comparable results to conventional implant impressions. However, with regard to the implant position transfer accuracy, there are still limitations for digital impression in the lower jaw.
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Affiliation(s)
- Alexander Schmidt
- Department of Prosthodontics - School of Dental Medicine, Justus Liebig University, Giessen, Germany
| | | | - Bernd Wöstmann
- Department of Prosthodontics - School of Dental Medicine, Justus Liebig University, Giessen, Germany
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Camarda AJ, Durand R, Benkarim M, Rompré PH, Guertin G, Ciaburro H. Prospective randomized clinical trial evaluating the effects of two different implant collar designs on peri-implant healing and functional osseointegration after 25 years. Clin Oral Implants Res 2021; 32:285-296. [PMID: 33314332 DOI: 10.1111/clr.13699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 11/15/2020] [Accepted: 11/26/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Evaluate the effects of two different machined-collar lengths and designs on peri-implant healing. MATERIAL AND METHODS An implant with a microtextured surface and 3.6mm-long internal-connection machined collar was compared to two implants that had an identical 1.2mm-long external-connection machined collar, but one had the microtextured surface while the other's was machined. Participants received the three implants, with microgap at the crest, alternately at five sites between mental foramen, and a full-arch prosthesis. Peri-implant bone levels were measured after 23 to 26 years of function. Keratinized tissue height, plaque, probing depth, bleeding, and purulence were also evaluated. Descriptive and mixed models for repeated\measures analyses were used, with Bonferroni correction for pairwise comparisons. RESULTS Twenty-two participants (110 implants) were evaluated at the 25-year examination. Microtextured implants with the longer machined collar had significantly greater mean marginal bone loss (-1.77mm ± 0.18, mean ± SE) than machined (-0.85mm ± 0.18, p < .001) and microtextured (-1.00 ± 0.18mm, p < .001) implants with the shorter machined collar. Keratinized tissue height was greater for internal-connection (0.74mm ± 0.10) versus external-connection (0.51 ± 0.08, p = 0.01) microtextured implants. No differences were observed for plaque (p = 0.78), probing depth (p = 0.42), bleeding (p = 0.07), and purulence (p = 1.00). Implant survival rate was 99%. CONCLUSIONS Implants with the 1.2mm machined collar limited bone loss to 1mm, while those with the longer machined collar showed > 1.5mm loss after 25 years of function with microgap at the crest. Internal-connection design and fixture surface microtexturing did not result in greater bone preservation. ClinicalTrials.gov Identifier: NCT03862482.
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Affiliation(s)
- Aldo Joseph Camarda
- Département de stomatologie, Faculty of Dental Medicine, Université de Montréal, Pavillion Roger-Gaudry, Montreal, QC, Canada
| | - Robert Durand
- Département de santé buccale, Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - Marwa Benkarim
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - Pierre H Rompré
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - Geneviève Guertin
- Département de dentisterie de restauration, Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - Hugo Ciaburro
- Département de dentisterie de restauration, Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
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13
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Novel design of additive manufactured hollow porous implants. Dent Mater 2020; 36:1437-1451. [PMID: 32962852 DOI: 10.1016/j.dental.2020.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 07/10/2020] [Accepted: 08/29/2020] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Our aim is to examine the mechanical properties of two types of additive manufactured hollow porous dental implants and 6 and 12-week bone ingrowth after insertion in animals. A 3D numerical model is also developed to show detailed tissue differentiation and to provide design guidelines for implants. METHODS The two porous and a commercial dental implant were studied by series of in vitro mechanical tests (three-point bending, torsional, screwing torque, and sawbone pull-out tests). They also evaluated by in vivo animal tests (micro-CT analysis) and ex vivo pull-out tests. Moreover, the mechano-regulation algorithm was implemented by the 3D finite element model to predict the history of tissue differentiation around the implants. RESULTS The results showed that the two porous implants can significantly improve osseointegration after 12-week bone healing. This resulted in good fixation and stability of implants, giving very high maximum pull-out strength 413.1 N and 493.2 N, compared to 245.7 N for the commercial implant. Also, several features were accurately predicted by the mechano-regulation model, such as transversely connected bone formation, and bone resorption occurred in the middle of implants. SIGNIFICANCE Systematic studies on dental implants with multiple approaches, including new design, mechanical tests, animal tests, and numerical modeling, were performed. Two hollow porous implants significantly improved bone ingrowth compared with commercial implants, while maintaining mechanical strength. Also, the numerical model was verified by animal tests. It improved the efficiency of design and reduce the demand for animal sacrifice.
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14
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Biomechanical Evaluation of Initial Stability of a Root Analogue Implant Design with Drilling Protocol: A 3D Finite Element Analysis. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10124104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: The aim of this study was to biomechanically evaluate the initial stability of a patient-specific root analogue implant (RAI) design with drilling protocol by comparing it to designs without drilling protocol through a 3D finite element analysis (FEA). Methods: A 3D surface model of an RAI for the upper right incisor was constructed. To evaluate the effect of root apex drilling, four modified RAI shapes were designed with the press-fit implantation method: Non-modified, wedge added at root surface, lattice added at root surface, and apex-anchor added at root apex (AA). Each model was subjected to an oblique load of 100 N. To simulate the initial stability of implantation, contact conditions at the implant–bone interface were set to allow for the sliding phenomenon with low friction (frictional coefficient 0.1–0.5). Analysis was performed to evaluate micro-displacements of the implants and peak stress on the surrounding bones. Results: Under all low frictional coefficient conditions, the lowest von Mises stress level on the cortical bone and fewest micro-displacements of the implant were observed in the AA design. Conclusion: In view of these results, the AA design proved superior in reducing the stress concentration on the supporting cortical bone and the micro-displacement of RAI.
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Hsieh MC, Huang CH, Lin CL, Hsu ML. Effect of implant design on the initial biomechanical stability of two self-tapping dental implants. Clin Biomech (Bristol, Avon) 2020; 74:124-130. [PMID: 32361012 DOI: 10.1016/j.clinbiomech.2020.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 02/02/2020] [Accepted: 02/19/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND This study evaluated the effect of two self-tapping implants on implant stability in immediate implantation. METHODS Two types of self-tapping implants, straight flute (STF) and spiral flute (SPF) designs, were studied. Two synthetic bone blocks with varying densities (0.32 g/cm3 and 0.16 g/cm3) were chosen to simulate the bone quality of the anterior maxilla. Insertion torque values were measured by a torque testing machine during implant insertion. Four biomechanical tests were performed: resonance frequency analysis was conducted using the Osstell device, and the strengths of screw push-in, lateral bending, and pull-out were evaluated using an MTS machine. The strength for each design feature was obtained by averaging the results of 10 trials. In total, 40 specimens were tested for each bone density. Statistical difference was determined by one-way analysis of variance followed by Bonferroni post hoc multiple tests between groups. FINDINGS The STF and SPF groups exhibited similar insertion torque values (p = 0.525 in low-density bone, and p = 0.99 in high-density bone). A significant difference (p < 0.001) was observed in the push-in test between the two groups when low-density bone was tested. The SPF group exhibited a significantly higher lateral bending force (p = 0.001) and a higher stiffness (p < 0.001) than the STF group in high-density bone. The SPF design attained higher (p < 0.001) ISQ numbers than the STF design, but all numbers were below 60. INTERPRETATION Implant stability can be influenced by the apical fixture design of self-tapping implants in immediate implantation.
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Affiliation(s)
- Min-Chieh Hsieh
- Department of Dentistry, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
| | - Chang-Hung Huang
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City, Taiwan
| | - Chun-Li Lin
- School of Biomedical Engineering, National Yang-Ming University, Taipei, Taiwan
| | - Ming-Lun Hsu
- School of Dentistry, National Yang-Ming University, Taipei, Taiwan.
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Talmazov G, Veilleux N, Abdulmajeed A, Bencharit S. Finite element analysis of a one-piece zirconia implant in anterior single tooth implant applications. PLoS One 2020; 15:e0229360. [PMID: 32092128 PMCID: PMC7039452 DOI: 10.1371/journal.pone.0229360] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 02/04/2020] [Indexed: 11/19/2022] Open
Abstract
This study evaluated the von Mises stress (MPa) and equivalent strain occurring around monolithic yttria-zirconia (Zir) implant using three clinically simulated finite element analysis (FEA) models for a missing maxillary central incisor. Two unidentified patients' cone-beam computed tomography (CBCT) datasets with and without right maxillary central incisor were used to create the FEA models. Three different FEA models were made with bone structures that represent a healed socket (HS), reduced bone width edentulous site (RB), and immediate extraction socket with graft (EG). A one-piece abutment-implant fixture mimicking Straumann Standard Plus tissue level RN 4.1 X 11.8mm, for titanium alloy (Ti) and Zir were modeled. 178 N oblique load and 200 N vertical load were used to simulate occlusal loading. Von Mises stress and equivalent strain values for around each implant model were measured. Within the HS and RB models the labial-cervical region in the cortical bone exhibited highest stress, with Zir having statistically significant lower stress-strain means than Ti in both labial and palatal aspects. For the EG model the labial-cervical area had no statistically significant difference between Ti and Zir; however, Zir performed better than Ti against the graft. FEA models suggest that Ti, a more elastic material than Zir, contributes to the transduction of more overall forces to the socket compared to Zir. Thus, compared to Ti implants, Zir implants may be less prone to peri-implant bone overloading and subsequent bone loss in high stress areas especially in the labial-cervical region of the cortical bone. Zir implants respond to occlusal loading differently than Ti implants. Zir implants may be more favorable in non-grafted edentulous or immediate extraction with grafting.
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Affiliation(s)
- Georgi Talmazov
- Department of General Practice, School of Dentistry, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Nathan Veilleux
- Department of Biomedical Engineering, College of Engineering, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Aous Abdulmajeed
- Department of General Practice, School of Dentistry, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Sompop Bencharit
- Department of General Practice, School of Dentistry, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Department of Biomedical Engineering, College of Engineering, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Department of Oral & Maxillofacial Surgery, School of Dentistry Commonwealth University, Richmond, Virginia, United States of America
- * E-mail:
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17
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Niroomand MR, Arabbeiki M. Implant stability in different implantation stages: Analysis of various interface conditions. INFORMATICS IN MEDICINE UNLOCKED 2020. [DOI: 10.1016/j.imu.2020.100317] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Micromotion of implant-abutment interfaces (IAI) after loading: correlation of finite element analysis with in vitro performances. Med Biol Eng Comput 2019; 57:1133-1144. [PMID: 30656596 DOI: 10.1007/s11517-018-1937-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 12/04/2018] [Indexed: 02/05/2023]
Abstract
Micromotion between IAI affects long-term survival rate of dental implants. The use of practical implants for mechanical test is costly. Finite element analysis (FEA) could test the micron level deformation changes, but whether it reflects the in vitro mechanical performances remains unknown. This study aims to investigate the correlation between IAI micromotion of FEA and in vitro performances. The two-step-two-component FEA method was used to test the relative deformation between IAI for three implant designs (M1, M2, and M3) during torque loading and cyclic oblique loading. The micromotion was divided into directions that perpendicular to (x-axis) and parallel to (y-axis) IAI. In vitro experiments on the micromotion relevant performance of IAI microleakage (tested by toluidine blue releasing with a spectrometer) and IAI locked condition (tested by abutment removal force tests after detaching the central screws) were also conducted for the identical implant systems (G1, G2, and G3). One-way ANOVA and Pearson's correlation tests were performed for data analysis. FEA illustrated that the three implant systems performed different micromotion patterns. Significant differences were found in the IAI microleakage and removal force among the groups. Positive correlations were found between FEA and in vitro outcomes. Therefore, the two-step-two-component FEA method is an appropriate method to evaluate the IAI micromotion after loading. Graphical abstract The correspondence of IAI micromotion between FEA analysis and in vitro performances.
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The sensitivity of contact stresses in the mandibular premolar region to the shape of Zirconia dental implant: A 3D finite element study. POLISH JOURNAL OF MEDICAL PHYSICS AND ENGINEERING 2018. [DOI: 10.2478/pjmpe-2018-0008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Background: Implant thread profile plays a vital role in magnitude and distribution of contact stresses at the implant-bone interface. The main goal of this study was to evaluate the biomechanical effects of four distinct thread profiles of a dental implant in the mandibular premolar region.
Methods: The dental implant represented the biocompatible Zirconia material and the bone block was modelled as transversely isotropic and elastic material. Three-dimensional finite element simulations were conducted for four distinct thread profiles of a dental implant at 50%, 75%, and 100% osseointegration. An axial static load of 500 N was applied on the abutment surface to estimate the stresses acting within the bones surrounding the implant.
Results: Regions of stress concentration were seen mostly along the mesiodistal direction compared to that in the buccolingual direction. The cortical bone close to the cervical region of the implant and the cortical bone next to the first thread of the implant experienced peak stress concentration. Increasing the degree of osseointegration resulted in increased von-Mises stresses on the implant-cortical transition region, the implant-cancellous transition region, the cortical bone, and the cancellous bone.
Conclusion: The results show that the application of distinct thread profiles at different degrees of osseointegration had significant effect on the stresses distribution contours in the surrounding bony structure. Comparing all four thread profiles, a dental implant with V-thread profile induced lower values of von-Mises stresses and shear stresses on the implant-cortical transition region, implant-cancellous transition region, cortical bone, and cancellous bone.
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He Y, Hasan I, Keilig L, Fischer D, Ziegler L, Abboud M, Wahl G, Bourauel C. Numerical investigation of bone remodelling around immediately loaded dental implants using sika deer (Cervus nippon) antlers as implant bed. Comput Methods Biomech Biomed Engin 2018; 21:359-369. [PMID: 29658297 DOI: 10.1080/10255842.2018.1462346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
This study combines finite element method and animal studies, aiming to investigate tissue remodelling processes around dental implants inserted into sika deer antler and to develop an alternative animal consuming model for studying bone remodelling around implants. Implants were inserted in the antlers and loaded immediately via a self-developed loading device. After 3, 4, 5 and 6 weeks, implants and surrounding tissue were taken out. Specimens were scanned by μCT scanner and finite element models were generated. Immediate loading and osseointegration conditions were simulated at the implant-tissue interface. A vertical force of 10 N was applied on the implant. During the healing time, density and Young's modulus of antler tissue around the implant increased significantly. For each time point, the values of displacement, stresses and strains in the osseointegration model were lower than those of the immediate loading model. As the healing time increased, the displacement of implants was reduced. The 3-week immediate loading model (9878 ± 1965 μstrain) illustrated the highest strains in the antler tissue. Antler tissue showed similar biomechanical properties as human bone in investigating the bone remodelling around implants, therefore the use of sika deer antler model is a promising alternative in implant biomechanical studies.
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Affiliation(s)
- Yun He
- a Orofacial Reconstruction and Regeneration Laboratory, Department of Oral and Maxillofacial Surgery , The Hospital of Stomatology, Southwest Medical University , Luzhou , China
| | - Istabrak Hasan
- b Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School , Rheinische Friedrich Wilhelms Universitat Bonn, Endowed Chair of Oral Technology , Bonn , Germany
| | - Ludger Keilig
- c Oral Technology , University of Bonn , Bonn , Germany
| | - Dominik Fischer
- d Clinic for Birds, Reptiles, Amphibians and Fish, Veterinary Faculty , Justus Liebig University Giessen , Giessen , Germany
| | - Luisa Ziegler
- d Clinic for Birds, Reptiles, Amphibians and Fish, Veterinary Faculty , Justus Liebig University Giessen , Giessen , Germany
| | - Marcus Abboud
- e Department of Prosthodontics and Digital Technology, School of Dental Medicine , Stony Brook University , New York , NY , USA
| | - Gerhard Wahl
- f Department of Oral Surgery, Dental School , University of Bonn , Bonn , Germany
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Sugiura T, Yamamoto K, Horita S, Murakami K, Kirita T. Micromotion analysis of different implant configuration, bone density, and crestal cortical bone thickness in immediately loaded mandibular full-arch implant restorations: A nonlinear finite element study. Clin Implant Dent Relat Res 2017; 20:43-49. [DOI: 10.1111/cid.12573] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 10/23/2017] [Accepted: 11/21/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Tsutomu Sugiura
- Department of Oral and Maxillofacial Surgery; Nara Medical University; Kashihara Nara Japan
| | - Kazuhiko Yamamoto
- Department of Oral and Maxillofacial Surgery; Nara Medical University; Kashihara Nara Japan
| | - Satoshi Horita
- Department of Oral and Maxillofacial Surgery; Nara Medical University; Kashihara Nara Japan
| | - Kazuhiro Murakami
- Department of Oral and Maxillofacial Surgery; Nara Medical University; Kashihara Nara Japan
| | - Tadaaki Kirita
- Department of Oral and Maxillofacial Surgery; Nara Medical University; Kashihara Nara Japan
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Sugiura T, Yamamoto K, Horita S, Murakami K, Tsutsumi S, Kirita T. Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis. J Periodontal Implant Sci 2017; 47:251-262. [PMID: 28861289 PMCID: PMC5577443 DOI: 10.5051/jpis.2017.47.4.251] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 07/28/2017] [Indexed: 12/25/2022] Open
Abstract
Purpose The purpose of this study was to investigate the effects of implant tilting and the loading direction on the displacement and micromotion (relative displacement between the implant and bone) of immediately loaded implants by in vitro experiments and finite element analysis (FEA). Methods Six artificial bone blocks were prepared. Six screw-type implants with a length of 10 mm and diameter of 4.3 mm were placed, with 3 positioned axially and 3 tilted. The tilted implants were 30° distally inclined to the axial implants. Vertical and mesiodistal oblique (45° angle) loads of 200 N were applied to the top of the abutment, and the abutment displacement was recorded. Nonlinear finite element models simulating the in vitro experiment were constructed, and the abutment displacement and micromotion were calculated. The data on the abutment displacement from in vitro experiments and FEA were compared, and the validity of the finite element model was evaluated. Results The abutment displacement was greater under oblique loading than under axial loading and greater for the tilted implants than for the axial implants. The in vitro and FEA results showed satisfactory consistency. The maximum micromotion was 2.8- to 4.1-fold higher under oblique loading than under vertical loading. The maximum micromotion values in the axial and tilted implants were very close under vertical loading. However, in the tilted implant model, the maximum micromotion was 38.7% less than in the axial implant model under oblique loading. The relationship between abutment displacement and micromotion varied according to the loading direction (vertical or oblique) as well as the implant insertion angle (axial or tilted). Conclusions Tilted implants may have a lower maximum extent of micromotion than axial implants under mesiodistal oblique loading. The maximum micromotion values were strongly influenced by the loading direction. The maximum micromotion values did not reflect the abutment displacement values.
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Affiliation(s)
- Tsutomu Sugiura
- Department of Oral and Maxillofacial Surgery, Nara Medical University, Nara, Japan
| | - Kazuhiko Yamamoto
- Department of Oral and Maxillofacial Surgery, Nara Medical University, Nara, Japan
| | - Satoshi Horita
- Department of Oral and Maxillofacial Surgery, Nara Medical University, Nara, Japan
| | - Kazuhiro Murakami
- Department of Oral and Maxillofacial Surgery, Nara Medical University, Nara, Japan
| | - Sadami Tsutsumi
- Applied Electronics Laboratory, Kanazawa Institute of Technology, Tokyo, Japan
| | - Tadaaki Kirita
- Department of Oral and Maxillofacial Surgery, Nara Medical University, Nara, Japan
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Biomechanical evaluation of implant-supported prosthesis with various tilting implant angles and bone types in atrophic maxilla: A finite element study. Comput Biol Med 2017; 86:47-54. [DOI: 10.1016/j.compbiomed.2017.04.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 04/22/2017] [Accepted: 04/23/2017] [Indexed: 12/13/2022]
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dos Santos MBF, Meloto GDO, Bacchi A, Correr-Sobrinho L. Stress distribution in cylindrical and conical implants under rotational micromovement with different boundary conditions and bone properties: 3-D FEA. Comput Methods Biomech Biomed Engin 2017; 20:893-900. [DOI: 10.1080/10255842.2017.1309394] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fatigue limits of different PEEK materials for dental implants. J Mech Behav Biomed Mater 2016; 69:163-168. [PMID: 28081481 DOI: 10.1016/j.jmbbm.2016.12.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 12/19/2016] [Accepted: 12/22/2016] [Indexed: 11/23/2022]
Abstract
The increasing use of PEEK (poly-ether-ether-ketone) as a substitute for metal implant components has led to the suggestion that it could also be used as an alternative to titanium in the field of dental implants. A major requirement for dental implant materials is their resistance to cyclic loading due to mastication. A special fatigue test was designed to evaluate the elastic behavior and long-term form stability of cylindrically shaped PEEK specimens of 4, 5 and 6mm in diameter, using 11 different PEEK materials of various grades: unfilled, filled with titanium dioxide or barium sulfate powder, reinforced with short carbon fibers or short glass fibers, and reinforced with continuous carbon fibers. The samples were exposed to cyclic loads of up to 2000N. The elastic limits ranged between 46.57±6.44MPa for short carbon fiber reinforced specimens of 6mm diameter and 107.62±8.23MPa for samples of a different short carbon fiber reinforced PEEK compound of 4mm diameter. The elastic limits of the two PEEK grades containing continuous carbon fibers could not be observed because they exceeded the limits of the test specification. The elastic moduli ranged between 2.06±0.18GPa for barium sulfate powder filled PEEK-specimens of 6 mm diameter and 57.53±14.3GPa for continuous carbon fibers reinforced PEEK-specimens of 4 mm diameter. In terms of the elastic limit all the PEEK materials in consideration were able to resist the pressure caused by maximum masticatory forces.
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Beline T, Garcia CS, Ogawa ES, Marques ISV, Matos AO, Sukotjo C, Mathew MT, Mesquita MF, Consani RX, Barão VAR. Surface treatment influences electrochemical stability of cpTi exposed to mouthwashes. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 59:1079-1088. [PMID: 26652467 DOI: 10.1016/j.msec.2015.11.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 08/10/2015] [Accepted: 11/16/2015] [Indexed: 11/26/2022]
Abstract
The role of surface treatment on the electrochemical behavior of commercially pure titanium (cpTi) exposed to mouthwashes was tested. Seventy-five disks were divided into 15 groups according to surface treatment (machined, sand blasted with Al2O3, and acid etched) and electrolyte solution (artificial saliva — control, 0.12% chlorhexidine digluconate, 0.05% cetylpyridinium chloride, 0.2% sodium fluoride, and 1.5% hydrogen peroxide) (n = 5). Open-circuit-potential and electrochemical impedance spectroscopy were conducted at baseline and after 7 and 14 days of immersion in each solution. Potentiodynamic test and total weight loss of disks were performed after 14 days of immersion. Scanning electron microscopy, energy dispersive spectroscopy, white light interferometry and profilometry were conducted for surface characterization before and after the electrochemical tests. Sandblasting promoted the lowest polarization resistance (Rp) (P b .0001) and the highest capacitance (CPE) (P b .006), corrosion current density (Icorr) and corrosion rate (P b .0001). In contrast, acid etching increased Rp and reduced CPE, independent to the mouthwash; while hydrogen peroxide reduced Rp (P b .008) and increased Icorr and corrosion rate (P b .0001). The highest CPE values were found for hydrogen peroxide and 0.2% sodium fluoride. Immersion for longer period improved the electrochemical stability of cpTi (P b .05). In conclusion, acid etching enhanced the electrochemical stability of cpTi. Hydrogen peroxide and sodium fluoride reduced the resistance to corrosion of cpTi, independent to the surface treatment. Chlorhexidine gluconate and cetylpyridinium chloride did not alter the corrosive behavior of cpTi.
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Affiliation(s)
- Thamara Beline
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; IBTN/Br - Institute of Biomaterials, Tribocorrosion and Nanomedicine, Brazilian Branch, Brazil
| | - Camila S Garcia
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil
| | - Erika S Ogawa
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; IBTN/Br - Institute of Biomaterials, Tribocorrosion and Nanomedicine, Brazilian Branch, Brazil
| | - Isabella S V Marques
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil
| | - Adaias O Matos
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; IBTN/Br - Institute of Biomaterials, Tribocorrosion and Nanomedicine, Brazilian Branch, Brazil
| | - Cortino Sukotjo
- Department of Restorative Dentistry, University of Illinois at Chicago, College of Dentistry, 801 S Paulina, Chicago, IL 60612, USA; IBTN - Institute of Biomaterials, Tribocorrosion and Nanomedicine, USA
| | - Mathew T Mathew
- IBTN - Institute of Biomaterials, Tribocorrosion and Nanomedicine, USA; Department of Orthopedic Surgery, Rush University Medical Center, 1611 W Harrison, Chicago, IL 60612, USA
| | - Marcelo F Mesquita
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil
| | - Rafael X Consani
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil
| | - Valentim A R Barão
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; IBTN/Br - Institute of Biomaterials, Tribocorrosion and Nanomedicine, Brazilian Branch, Brazil.
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Muelas-Jiménez MI, Olmedo-Gaya MV, Manzano-Moreno FJ, Reyes-Botella C, Vallecillo-Capilla M. Long-Term Survival of Dental Implants with Different Prosthetic Loading Times in Healthy Patients: A 5-Year Retrospective Clinical Study. J Prosthodont 2015; 26:99-106. [DOI: 10.1111/jopr.12371] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/07/2015] [Indexed: 11/27/2022] Open
Affiliation(s)
| | | | | | - Candela Reyes-Botella
- Department of Stomatology, School of Dentistry; University of Granada; Granada Spain
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García-Roncero H, Caballé-Serrano J, Cano-Batalla J, Cabratosa-Termes J, Figueras-Álvarez O. In-vitro development of a temporal abutment screw to protect osseointegration in immediate loaded implants. J Adv Prosthodont 2015; 7:160-5. [PMID: 25932315 PMCID: PMC4414947 DOI: 10.4047/jap.2015.7.2.160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/29/2014] [Accepted: 03/05/2015] [Indexed: 11/08/2022] Open
Abstract
PURPOSE In this study, a temporal abutment fixation screw, designed to fracture in a controlled way upon application of an occlusal force sufficient to produce critical micromotion was developed. The purpose of the screw was to protect the osseointegration of immediate loaded single implants. MATERIALS AND METHODS Seven different screw prototypes were examined by fixing titanium abutments to 112 Mozo-Grau external hexagon implants (MG Osseous®; Mozo-Grau, S.A., Valladolid, Spain). Fracture strength was tested at 30° in two subgroups per screw: one under dynamic loading and the other without prior dynamic loading. Dynamic loading was performed in a single-axis chewing simulator using 150,000 load cycles at 50 N. After normal distribution of obtained data was verified by Kolmogorov-Smirnov test, fracture resistance between samples submitted and not submitted to dynamic loading was compared by the use of Student's t-test. Comparison of fracture resistance among different screw designs was performed by the use of one-way analysis of variance. Confidence interval was set at 95%. RESULTS Fractures occurred in all screws, allowing easy retrieval. Screw Prototypes 2, 5 and 6 failed during dynamic loading and exhibited statistically significant differences from the other prototypes. CONCLUSION Prototypes 2, 5 and 6 may offer a useful protective mechanism during occlusal overload in immediate loaded implants.
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Affiliation(s)
- Herminio García-Roncero
- Department of Prosthodontics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
| | - Jordi Caballé-Serrano
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
| | - Jordi Cano-Batalla
- Department of Prosthodontics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
| | - Josep Cabratosa-Termes
- Department of Prosthodontics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
| | - Oscar Figueras-Álvarez
- Department of Prosthodontics, School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
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Schwitalla A, Abou-Emara M, Spintig T, Lackmann J, Müller W. Finite element analysis of the biomechanical effects of PEEK dental implants on the peri-implant bone. J Biomech 2015; 48:1-7. [DOI: 10.1016/j.jbiomech.2014.11.017] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 11/11/2014] [Accepted: 11/12/2014] [Indexed: 10/24/2022]
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30
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Jimbo R, Tovar N, Marin C, Teixeira H, Anchieta R, Silveira L, Janal M, Shibli J, Coelho P. The impact of a modified cutting flute implant design on osseointegration. Int J Oral Maxillofac Surg 2014; 43:883-8. [DOI: 10.1016/j.ijom.2014.01.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 10/23/2013] [Accepted: 01/30/2014] [Indexed: 10/25/2022]
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Faverani LP, Assunção WG, de Carvalho PSP, Yuan JCC, Sukotjo C, Mathew MT, Barao VA. Effects of dextrose and lipopolysaccharide on the corrosion behavior of a Ti-6Al-4V alloy with a smooth surface or treated with double-acid-etching. PLoS One 2014; 9:e93377. [PMID: 24671257 PMCID: PMC3966875 DOI: 10.1371/journal.pone.0093377] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 03/03/2014] [Indexed: 12/28/2022] Open
Abstract
Diabetes and infections are associated with a high risk of implant failure. However, the effects of such conditions on the electrochemical stability of titanium materials remain unclear. This study evaluated the corrosion behavior of a Ti-6Al-4V alloy, with a smooth surface or conditioned by double-acid-etching, in simulated body fluid with different concentrations of dextrose and lipopolysaccharide. For the electrochemical assay, the open-circuit-potential, electrochemical impedance spectroscopy, and potentiodynamic test were used. The disc surfaces were characterized by scanning electron microscopy and atomic force microscopy. Their surface roughness and Vickers microhardness were also tested. The quantitative data were analyzed by Pearson's correlation and independent t-tests (α = 0.05). In the corrosion parameters, there was a strong lipopolysaccharide correlation with the Ipass (passivation current density), Cdl (double-layer capacitance), and Rp (polarization resistance) values (p<0.05) for the Ti-6Al-4V alloy with surface treatment by double-acid-etching. The combination of dextrose and lipopolysaccharide was correlated with the Icorr (corrosion current density) and Ipass (p<0.05). The acid-treated groups showed a significant increase in Cdl values and reduced Rp values (p<0.05, t-test). According to the topography, there was an increase in surface roughness (R2 = 0.726, p<0.0001 for the smooth surface; R2 = 0.405, p = 0.036 for the double-acid-etching-treated surface). The microhardness of the smooth Ti-6Al-4V alloy decreased (p<0.05) and that of the treated Ti-6Al-4V alloy increased (p<0.0001). Atomic force microscopy showed changes in the microstructure of the Ti-6Al-4V alloy by increasing the surface thickness mainly in the group associated with dextrose and lipopolysaccharide. The combination of dextrose and lipopolysaccharide affected the corrosion behavior of the Ti-6Al-4V alloy surface treated with double-acid-etching. However, no dose-response corrosion behavior could be observed. These results suggest a greater susceptibility to corrosion of titanium implants in diabetic patients with associated infections.
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Affiliation(s)
- Leonardo P. Faverani
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, Universidade Estadual Paulista (UNESP), Aracatuba, São Paulo, Brazil
- Department of Surgery and Integrated Clinic, Aracatuba Dental School, Universidade Estadual Paulista (UNESP), Aracatuba, São Paulo, Brazil
| | - Wirley G. Assunção
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, Universidade Estadual Paulista (UNESP), Aracatuba, São Paulo, Brazil
| | - Paulo Sérgio P. de Carvalho
- Department of Surgery and Integrated Clinic, Aracatuba Dental School, Universidade Estadual Paulista (UNESP), Aracatuba, São Paulo, Brazil
| | - Judy Chia-Chun Yuan
- Department of Restorative Dentistry, University of Illinois at Chicago–College of Dentistry, Chicago, Illinois, United States of America
| | - Cortino Sukotjo
- Department of Restorative Dentistry, University of Illinois at Chicago–College of Dentistry, Chicago, Illinois, United States of America
| | - Mathew T. Mathew
- Department of Restorative Dentistry, University of Illinois at Chicago–College of Dentistry, Chicago, Illinois, United States of America
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Valentim A. Barao
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, Universidade of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
- * E-mail:
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32
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The effect of drilling speed on early bone healing to oral implants. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 116:550-5. [DOI: 10.1016/j.oooo.2013.07.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 05/25/2013] [Accepted: 07/05/2013] [Indexed: 11/19/2022]
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Jung UW, Kim S, Lee IK, Kim MS, Lee JS, Kim HJ. Secondary stability of microthickness hydroxyapatite-coated dental implants installed without primary stability in dogs. Clin Oral Implants Res 2013; 25:1169-74. [DOI: 10.1111/clr.12226] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Ui-Won Jung
- Department of Periodontology; Research Institute for Periodontal Regeneration; College of Dentistry; Yonsei University; Seoul Korea
| | - Sungtae Kim
- Department of Periodontology; Dental Research Institute; Seoul National University School of Dentistry; Seoul Korea
| | - In-Kyeong Lee
- Department of Periodontology; Research Institute for Periodontal Regeneration; College of Dentistry; Yonsei University; Seoul Korea
| | - Min-Soo Kim
- Department of Periodontology; Research Institute for Periodontal Regeneration; College of Dentistry; Yonsei University; Seoul Korea
| | - Jung-Seok Lee
- Department of Periodontology; Research Institute for Periodontal Regeneration; College of Dentistry; Yonsei University; Seoul Korea
| | - Hee-Jin Kim
- Division in Anatomy and Developmental Biology; Department of Oral Biology; Human Identification Research Center; College of Dentistry; Yonsei University; Seoul Korea
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Micromotion of Dental Implants: Basic Mechanical Considerations. J Med Eng 2012; 2013:265412. [PMID: 27017916 PMCID: PMC4787303 DOI: 10.1155/2013/265412] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 09/23/2012] [Indexed: 11/18/2022] Open
Abstract
Micromotion of dental implants may interfere with the process of osseointegration. Using three different types of virtual biomechanical models, varying contact types between implant and bone were simulated, and implant deformation, bone deformation, and stress at the implant-bone interface were recorded under an axial load of 200 N, which reflects a common biting force. Without friction between implant and bone, a symmetric loading situation of the bone with maximum loading and displacement at the apex of the implant was recorded. The addition of threads led to a decrease in loading and displacement at the apical part, but loading and displacement were also observed at the vertical walls of the implants. Introducing friction between implant and bone decreased global displacement. In a force fit situation, load transfer predominantly occurred in the cervical area of the implant. For freshly inserted implants, micromotion was constant along the vertical walls of the implant, whereas, for osseointegrated implants, the distribution of micromotion depended on the location. In the cervical aspect some minor micromotion in the range of 0.75 μm could be found, while at the most apical part almost no relative displacement between implant and bone occurred.
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