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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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Liu Y, Huang X, Ke H, Song X, Huang X, Sun S. Influence of Access Cavities on Maxillary Central Incisor Fracture Resistance: Finite Element Study. Int Dent J 2024:S0020-6539(24)00121-7. [PMID: 38692963 DOI: 10.1016/j.identj.2024.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 03/26/2024] [Accepted: 04/08/2024] [Indexed: 05/03/2024] Open
Abstract
INTRODUCTION AND AIMS Altering the position and orientation of the root canal access cavity passway, or modifying the reduction of dentin volume, can influence the strength of dentition. This study aimed to compare the effects of different access cavities on the biomechanical performances of maxillary central incisors with a finite element analysis. METHODS Based on the micro-computed tomography (CT) scan of a maxillary central incisor, the finite element models of the intact tooth and teeth with 4 access cavity designs: conservative incisal access cavity, incisal access cavity, conservative access cavity, and traditional access cavity were generated. Simulated occlusal forces were applied at the incisal edge of the incisor in the finite element analysis procedure. RESULTS The maximum von Mises stress and maximum principal stress in the cervical area are highest in the traditional access cavity group, followed by the conservative access cavity group, incisal access cavity group, and conservative incisal access cavity group. CONCLUSION The conservative access cavities minimise the extent of dentin removal from the cervical region, protecting the mechanical behaviour of the incisor. Moving the access cavity entry point to the incisal edge also improves the fracture resistance of the incisor. CLINICAL RELEVANCE This study's findings would help clinicians select the most appropriate endodontics access cavity method when performing the root canal on maxillary central incisors.
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Affiliation(s)
- Yujiang Liu
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinyao Huang
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Haoyu Ke
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinyi Song
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinmeng Huang
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Shufen Sun
- Hospital of Stomatology, Jilin University, Changchun, PR China.
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Cruz RS, Fernandes E Oliveira HF, Lemos CAA, de Souza Batista VE, Capalbo da Silva R, Verri FR. Biomechanical influence of narrow-diameter implants placed at the crestal and subcrestal level in the maxillary anterior region. A 3D finite element analysis. J Prosthodont 2024; 33:180-187. [PMID: 36799260 DOI: 10.1111/jopr.13667] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 01/26/2023] [Accepted: 02/05/2023] [Indexed: 02/18/2023] Open
Abstract
PURPOSE To evaluate the tendency of movement, stress distribution, and microstrain of single-unit crowns in simulated cortical and trabecular bone, implants, and prosthetic components of narrow-diameter implants with different lengths placed at the crestal and subcrestal levels in the maxillary anterior region using 3D finite element analysis (FEA). MATERIALS AND METHODS Six 3D models were simulated using Invesalius 3.0, Rhinoceros 4.0, and SolidWorks software. Each model simulated the right anterior maxillary region including a Morse taper implant of Ø2.9 mm with different lengths (7, 10, and 13 mm) placed at the crestal and subcrestal level and supporting a cement-retained monolithic single crown in the area of tooth 12. The FEA was performed using ANSYS 19.2. The simulated applied force was 178 N at 0°, 30°, and 60°. The results were analyzed using maps of displacement, von Mises (vM) stress, maximum principal stress, and microstrain. RESULTS Models with implants at the subcrestal level showed greater displacement. vM stress increased in the implant and prosthetic components when implants were placed at the subcrestal level compared with the crestal level; the length of the implants had a low influence on the stress distribution. Higher stress and strain concentrations were observed in the cortical bone of the subcrestal placement, independent of implant length. Non-axial loading influenced the increased stress and strain in all the evaluated structures. CONCLUSIONS Narrow-diameter implants positioned at the crestal level showed a more favorable biomechanical behavior for simulated cortical bone, implants, and prosthetic components. Implant length had a smaller influence on stress or strain distribution than the other variables.
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Affiliation(s)
- Ronaldo S Cruz
- Department of Dental Materials and Prosthodontics, Araçatuba Dental School (UNESP), Univ Estadual Paulista, Araçatuba, Brazil
| | | | - Cleidiel Aparecido Araújo Lemos
- Department of Dentistry (Division of Prosthodontics), Federal University of Juiz de Fora (UFJF)-Campus Governador Valadares, Governador Valadares, Minas Gerais, Brazil
| | - Victor Eduardo de Souza Batista
- Department Prosthodontics, Presidente Prudente Dental School, The University of Western São Paulo (UNOESTE), Presidente Prudente, Brazil
| | - Rodrigo Capalbo da Silva
- Department of Dental Materials and Prosthodontics, Araçatuba Dental School (UNESP), Univ Estadual Paulista, Araçatuba, Brazil
| | - Fellippo R Verri
- Department of Dental Materials and Prosthodontics, Araçatuba Dental School (UNESP), Univ Estadual Paulista, Araçatuba, Brazil
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Andrade CS, de Abreu Costa L, Menechelli LG, Lemos CAA, Okamoto R, Verri FR, de Souza Batista VE. Biomechanical effects of different materials for an occlusal device on implant-supported rehabilitation in a tooth clenching situation. A 3D finite element analysis. J Prosthodont 2023. [PMID: 37675950 DOI: 10.1111/jopr.13763] [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: 04/19/2023] [Accepted: 08/31/2023] [Indexed: 09/08/2023] Open
Abstract
PURPOSE The purpose of this 3D finite element analysis was to evaluate the biomechanical effects of different materials used to fabricate occlusal devices to achieve stress distribution in simulated abutment screws, dental implants, and peri-implant bone tissue in individuals who clench their teeth. MATERIALS AND METHODS Eight 3D models simulated a posterior maxillary bone block with three external hexagon implants (Ø4.0 × 7.0 mm) supporting a 3-unit screw-retained metal-ceramic prosthesis with different crown connection (splinting), and the use of an occlusal device (OD). The OD was modeled to be 2-mm thick. ANSYS 19.2 software was used to generate the finite-element models in the pre-and post-processing phases. Simulated abutment screws and dental implants were evaluated by von Mises stress maps, and simulated bone was evaluated by maximum principal stress and microstrain maps by using a finite element software program. RESULTS The highest stress values in the dental implants and screws were observed in single crowns without OD (M1). Furthermore, the highest stress values and bone tissue strain were found in single crowns without OD (M1). The simulated material for the OD did not cause many discrepancies in terms of the stress magnitude in the simulated dental implant and abutment screw for both single and splinted crowns; however, more rigid materials exhibited lower stress values. CONCLUSION The use of OD was effective in reducing stress in the simulated implants and abutment screws and stress and strain in the simulated bone tissue. The material used to simulate the OD influenced the biomechanical behavior of implant-supported fixed prostheses, whereas splints with rigid materials such as PEEK and PMMA exhibited better biomechanical behavior.
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Affiliation(s)
- Carla Souza Andrade
- Department of Prosthodontics, Presidente Prudente Dental School, University of Western São Paulo - UNOESTE, Presidente Prudente, Brazil
| | - Luy de Abreu Costa
- Department of Diagnosis and Surgery, Araçatuba Dental School, São Paulo State University Júlio de Mesquita Filho-UNESP, Araçatuba, Brazil
| | - Luana Gonçalves Menechelli
- Department of Diagnosis and Surgery, Araçatuba Dental School, São Paulo State University Júlio de Mesquita Filho-UNESP, Araçatuba, Brazil
| | - Cleidiel A A Lemos
- Department of Dentistry (Division of Prosthodontics), Federal University of Juiz de Fora, Campus Avançado Governador Valadares (UFJF/GV), Governador Valadares, Minas Gerais, Brazil
| | - Roberta Okamoto
- Department of Basic Sciences, Universidade Estadual Paulista Júlio de Mesquita Filho, School of Dentistry at Araçatuba, Araçatuba, Brazil
| | - Fellippo R Verri
- Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University Júlio de Mesquita Filho-UNESP, Araçatuba, Brazil
| | - Victor Eduardo de Souza Batista
- Department of Prosthodontics, Presidente Prudente Dental School, University of Western São Paulo - UNOESTE, Presidente Prudente, Brazil
- Postgraduate Program in Dentistry - Implantology concentration area, Araçatuba Dental School, São Paulo State University Júlio de Mesquita Filho-UNESP, Araçatuba, Brazil
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An Y, Xie L, Liu Y, Wu P, Li H, Jiang J, Zhang Z, Yang S. Research on skull trauma biomechanical stress distribution in case of dental implants existence. Technol Health Care 2022; 31:821-829. [PMID: 36442219 DOI: 10.3233/thc-220148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND: When the jaw bone is subjected to an external force, the stress is transmitted from the force point along the alveolar bone to the skull and skull base. In the case of a dental implant, the stress distribution is mainly dependent on the implant position, type, and mechanical properties. OBJECTIVE: To investigate the dental implant position influence on the stress distribution and transmission in case of facial frontal trauma. Furthermore, the correlation between facial trauma and skull trauma in the case of a dental implant exists. METHODS: In this study, a Finite Element Method (FEM) model was constructed based on a real skull shape, size, and anatomy. Dental implants were modeled based on imported CAD Data. Five cases were investigated including no dental implant and the replacement of teeth no. 18, 19 20 and 21. Facial trauma was mimicked by applying an external load on the lower frontal jaw. Finally, the stress distribution based on the bone geometry and implant position were evaluated and compared. RESULTS: Results suggested that a dental implant could significantly influence the stress distribution in the skull in case of facial trauma. In addition, the dental position greatly affects stress transmission from the mandible to the skull bones through the zygomatic arch. CONCLUSION: The position of the dental implant could have a significant role in stress transmission and distribution in case of facial or even brain trauma. Thus, increasing the possibility of a correlation between facial and brain trauma.
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Affiliation(s)
- Yang An
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Ling Xie
- Department of Stomatology, People’s Hospital of Tianfu New District, Chengdu, Sichuan, China
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Yu Liu
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Po Wu
- Department of Stomatology, People’s Hospital of Tianfu New District, Chengdu, Sichuan, China
| | - Hao Li
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Ji Jiang
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Zhengrui Zhang
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
| | - Shuyong Yang
- General Hospital of the Western War Zone of the Chinese People’s Liberation Army, Chengdu, Sichuan, China
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Mao C, Yu W, Jin M, Wang Y, Shang X, Lin L, Zeng X, Wang L, Lu E. Mechanobiologically optimized Ti-35Nb-2Ta-3Zr improves load transduction and enhances bone remodeling in tilted dental implant therapy. Bioact Mater 2022; 16:15-26. [PMID: 35386333 PMCID: PMC8958422 DOI: 10.1016/j.bioactmat.2022.03.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 03/04/2022] [Accepted: 03/04/2022] [Indexed: 12/13/2022] Open
Abstract
The tilted implant with immediate function is increasingly used in clinical dental therapy for edentulous and partially edentulous patients with excessive bone resorption and the anatomic limitations in the alveolar ridge. However, peri-implant cervical bone loss can be caused by the stress shielding effect. Herein, inspired by the concept of “materiobiology”, the mechanical characteristics of materials were considered along with bone biology for tilted implant design. In this study, a novel Ti–35Nb–2Ta–3Zr alloy (TNTZ) implant with low elastic modulus, high strength and favorable biocompatibility was developed. Then the human alveolar bone environment was mimicked in goat and finite element (FE) models to investigate the mechanical property and the related peri-implant bone remodeling of TNTZ compared to commonly used Ti–6Al–4V (TC4) in tilted implantation under loading condition. Next, a layer-by-layer quantitative correlation of the FE and X-ray Microscopy (XRM) analysis suggested that the TNTZ implant present better mechanobiological characteristics including improved load transduction and increased bone area in the tilted implantation model compared to TC4 implant, especially in the upper 1/3 region of peri-implant bone that is “lower stress”. Finally, combining the static and dynamic parameters of bone, it was further verified that TNTZ enhanced bone remodeling in “lower stress” upper 1/3 region. This study demonstrates that TNTZ is a mechanobiological optimized tilted implant material that enhances load transduction and bone remodeling. The mechanical properties and deformation mechanisms of Ti–35Nb–2Ta–3Zr alloys were studied. The cell biocompatibility, a layer-by-layer correlation of the finite element and X-ray Microscopy analysis were evaluated. Ti–35Nb–2Ta–3Zr implant improves load transduction and enhances bone remodeling in tilted implantation models. Mechanobiologically optimized Ti–35Nb–2Ta–3Zr alloy meets the clinical application requirements of tilted implant therapy.
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Affiliation(s)
- Chuanyuan Mao
- Department of Stomatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Weijun Yu
- Department of Stomatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Min Jin
- Department of Stomatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Yingchen Wang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Materials Genome Initiative Centre, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xiaoqing Shang
- National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Lu Lin
- Department of Stomatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Xiaoqin Zeng
- National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- Corresponding author.
| | - Liqiang Wang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Materials Genome Initiative Centre, Shanghai Jiao Tong University, Shanghai, 200240, China
- Corresponding author.
| | - Eryi Lu
- Department of Stomatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
- Corresponding author.
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Alemayehu DB, Jeng YR. Three-Dimensional Finite Element Investigation into Effects of Implant Thread Design and Loading Rate on Stress Distribution in Dental Implants and Anisotropic Bone. MATERIALS 2021; 14:ma14226974. [PMID: 34832374 PMCID: PMC8624479 DOI: 10.3390/ma14226974] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 11/06/2021] [Accepted: 11/16/2021] [Indexed: 12/18/2022]
Abstract
Variations in the implant thread shape and occlusal load behavior may result in significant changes in the biological and mechanical properties of dental implants and surrounding bone tissue. Most previous studies consider a single implant thread design, an isotropic bone structure, and a static occlusal load. However, the effects of different thread designs, bone material properties, and loading conditions are important concerns in clinical practice. Accordingly, the present study performs Finite Element Analysis (FEA) simulations to investigate the static, quasi-static and dynamic response of the implant and implanted bone material under various thread designs and occlusal loading directions (buccal-lingual, mesiodistal and apical). The simulations focus specifically on the von Mises stress, displacement, shear stress, compressive stress, and tensile stress within the implant and the surrounding bone. The results show that the thread design and occlusal loading rate have a significant effect on the stress distribution and deformation of the implant and bone structure during clinical applications. Overall, the results provide a useful insight into the design of enhanced dental implants for an improved load transfer efficiency and success rate.
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Affiliation(s)
- Dawit-Bogale Alemayehu
- Department of Biomedical Engineering, National Cheng Kung University (NCKU), Tainan 70101, Taiwan;
| | - Yeau-Ren Jeng
- Department of Biomedical Engineering, National Cheng Kung University (NCKU), Tainan 70101, Taiwan;
- School of Smart Semiconductor and Sustainable Manufacturing, National Cheng Kung University (NCKU), Tainan 70101, Taiwan
- Medical Device Innovation Center (MDIC), National Cheng Kung University (NCKU), Tainan 70101, Taiwan
- Correspondence: ; Tel.: +886-933278212
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Ausiello P, Tribst JPM, Ventre M, Salvati E, di Lauro AE, Martorelli M, Lanzotti A, Watts DC. The role of cortical zone level and prosthetic platform angle in dental implant mechanical response: A 3D finite element analysis. Dent Mater 2021; 37:1688-1697. [PMID: 34497022 DOI: 10.1016/j.dental.2021.08.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/27/2021] [Accepted: 08/27/2021] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the influence of three different dental implant neck geometries, under a combined compressive/shear load using finite element analysis (FEA). The implant neck was positioned in D2 quality bone at the crestal level or 2 mm below. METHODS One dental implant (4.2 × 9 mm) was digitized by reverse engineering techniques using micro CT and imported into Computer Aided Design (CAD) software. Non-uniform rational B-spline surfaces were reconstructed, generating a 3D volumetric model similar to the digitized implant. Three different models were generated with different implant neck configurations, namely 0°, 10° and 20°. D2 quality bone, composed of cortical and trabecular structure, was modeled using data from CT scans. The implants were included in the bone model using a Boolean operation. Two different fixture insertion depths were simulated for each implant: 2 mm below the crestal bone and exactly at the level of the crestal bone. The obtained models were imported to FEA software in STEP format. Von Mises equivalent strains were analyzed for the peri-implant D2 bone type, considering the magnitude and volume of the affected surrounding cortical and trabecular bone. The highest strain values in both cortical and trabecular tissue at the peri-implant bone interface were extracted and compared. RESULTS All implant models were able to distribute the load at the bone-implant contact (BIC) with a similar strain pattern between the models. At the cervical region, however, differences were observed: the models with 10° and 20° implant neck configurations (Model B and C), showed a lower strain magnitude when compared to the straight neck (Model A). These values were significantly lower when the implants were situated at crestal bone levels. In the apical area, no differences in strain values were observed. SIGNIFICANCE The implant neck configuration influenced the strain distribution and magnitude in the cortical bone and cancellous bone tissues. To reduce the strain values and improve the load dissipation in the bone tissue, implants with 10° and 20 neck configuration should be preferred instead of straight implant platforms.
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Affiliation(s)
- Pietro Ausiello
- School of Dentistry, University of Naples Federico II, via S. Pansini 5, 80131 Naples, Italy.
| | | | - Maurizio Ventre
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, 80125 Naples, Italy; Center for Advanced Biomaterials for HealthCare@CRIB, Istituto Italiano di Tecnologia, 80125 Naples, Italy
| | - Enrico Salvati
- Polytechnic Department of Engineering and Architecture (DPIA), University of Udine, Via delle Scienze 206, Udine, Italy
| | - Alessandro E di Lauro
- School of Dentistry, University of Naples Federico II, via S. Pansini 5, 80131 Naples, Italy
| | - Massimo Martorelli
- Fraunhofer JL IDEAS, Department of Industrial Engineering, University of Naples Federico II, Naples, 80125, Italy
| | - Antonio Lanzotti
- Fraunhofer JL IDEAS, Department of Industrial Engineering, University of Naples Federico II, Naples, 80125, Italy
| | - David C Watts
- School of Medical Sciences and Photon Science Institute, University of Manchester, UK
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Arcas LPB, Baroudi K, Silva-Concílio LR, Claro CADA, Amaral M. Effect of different fabrication methods of occlusal devices on periradicular stress distribution: A photoelastic analysis. J Prosthet Dent 2021; 129:651-656. [PMID: 34344528 DOI: 10.1016/j.prosdent.2021.06.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/23/2021] [Accepted: 06/23/2021] [Indexed: 12/27/2022]
Abstract
STATEMENT OF PROBLEM Investigations on the effectiveness of new methods for optimizing the fabrication of oral devices are lacking. PURPOSE The purpose of this in vitro study was to evaluate stress distribution with photoelastic analysis in the periradicular area of teeth supporting occlusal devices fabricated by 5 different processes. MATERIAL AND METHODS The occlusal devices were fabricated by vacuum thermoforming, heat-polymerized acrylic resin, chemical polymerized acrylic resin, 3-dimensional printing, and milling (computer-aided manufacturing). The devices were evaluated regarding initial fit, number of adjustments for passive fit, and stress distribution under 100-N and 400-N loads in the periradicular locations of posterior teeth. RESULTS The 3-dimensional printing device did not require any adjustment for initial adaptation to the photoelastic model and presented a little friction with the model. The heat-polymerized acrylic resin device did not seat initially, requiring more sites of adjustment until passive adaptation. At 100-N and 400-N loads, the use of the computer-aided manufacturing occlusal device resulted in the lowest stresses in periradicular areas (0.744 and 1.583, respectively), and the 3-dimensional printing occlusal device produced the highest stresses with a 400-N load application (2.427). The lowest mean of fringe pattern was observed for the computer-aided manufacturing device, and the highest mean of fringe pattern was observed for the vacuum thermoforming device. CONCLUSIONS The computer-aided design and computer-aided manufacturing milled occlusal device presented the best initial adaptation and transferred lower stresses to the periradicular areas than the other evaluated devices.
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Affiliation(s)
- Luciana Paula Benício Arcas
- Master student, Pos Graduation Program in Dentistry, Department of Dentistry, University of Taubaté (UNITAU), Taubaté, Brazil
| | - Kusai Baroudi
- Professor, Department of Restorative Dentistry, Department of Dentistry, University of Taubaté (UNITAU), Taubaté, Brazil
| | - Laís Regiane Silva-Concílio
- Professor, Department of Restorative Dentistry, Department of Dentistry, University of Taubaté (UNITAU), Taubaté, Brazil
| | | | - Marina Amaral
- Professor, Department of Restorative Dentistry, Department of Dentistry, University of Taubaté (UNITAU), Taubaté, Brazil.
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Biomechanical effect of an occlusal device for patients with an implant-supported fixed dental prosthesis under parafunctional loading: A 3D finite element analysis. J Prosthet Dent 2021; 126:223.e1-223.e8. [PMID: 34099274 DOI: 10.1016/j.prosdent.2021.04.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 04/18/2021] [Accepted: 04/21/2021] [Indexed: 11/21/2022]
Abstract
STATEMENT OF PROBLEM Whether providing an occlusal device for a patient with bruxism and an implant-supported fixed dental prosthesis leads to improved biomechanics is unclear. PURPOSE The purpose of this 3D finite element analysis (FEA) study was to evaluate the biomechanical behavior of 3-unit implant-supported prostheses under parafunctional forces with and without an occlusal device. MATERIALS AND METHODS Eight 3D models consisting of a posterior (type IV) maxillary bone block with 3 external hexagon implants (Ø4.0×7.0 mm) and 3-unit implant-supported prostheses with different crown connections (splinted or unsplinted) and an occlusal device under functional and parafunctional loading were simulated. The abutment screws were evaluated by von Mises stress maps, and the bone tissue by maximum principal stress and microstrain maps by using a finite element software program. RESULTS An occlusal device improved the biomechanical behavior of the prostheses by reducing stress in the abutment screws and stress and strain in the bone tissue. However, the use of an occlusal device was not sufficiently effective to negate the biomechanical benefit of splinting. CONCLUSIONS The use of splinted crowns in the posterior maxillary region with an occlusal device was the most effective method of reducing stress in the abutment screws and stress and strain in the bone tissue when parafunction was modeled.
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Mourya A, Nahar R, Mishra SK, Chowdhary R. Stress distribution around different abutments on titanium and CFR-PEEK implant with different prosthetic crowns under parafunctional loading: A 3D FEA study. J Oral Biol Craniofac Res 2021; 11:313-320. [PMID: 33816100 DOI: 10.1016/j.jobcr.2021.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/03/2021] [Accepted: 03/10/2021] [Indexed: 10/21/2022] Open
Abstract
Aim & objectives Clinical trials had concluded a significant relationship between implant failure and bruxism. A three-dimensional (3D) finite element analysis (FEA) was done to evaluate the stress distribution in straight and angled abutments around titanium and carbon fiber-reinforced polyetheretherketone (CFR-PEEK) implant with 2 different prosthetic crowns under parafunctional loading. Materials and method Twelve 3D models of bone block were created representing the maxillary right premolar area with osseointegrated implants. The models were divided in two group; CFR-PEEK implant (n = 6) and group titanium implant (n = 6).Each group was subdivided based on implants with three different abutments (straight, 15°, 25° angled abutments) and having two different prosthetic crowns: porcelain fused to metal (PFM) and polyetheretherketone (PEEK). A vertical load of 1000 N was applied to the central fossa and an oblique load of 500 N (30°) was applied to the buccal incline of the palatal cusp. The von Mises stresses and principal stresses were analyzed using ANSYS software. Results CFR-PEEK and titanium implants produced similar stress in bone under vertical and oblique loading. Straight abutment showed better results than 15° and 25° angled abutments in all the groups. PEEK crown produced lesser stress than PFM crown under vertical and oblique loading. Conclusion The study concluded that straight abutment along with PEEK crown could be given in patients with bruxism to reduce the stress concentration in bone, thus preventing possible implant failure. Titanium and CFR-PEEK implants with straight abutments if given, then it should be provided with an occlusal splint.
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Affiliation(s)
- Akanksha Mourya
- Department of Prosthodontics, People's College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Rajvi Nahar
- Department of Prosthodontics, People's College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Sunil Kumar Mishra
- Department of Prosthodontics, Rama Dental College, Hospital and Research Centre, Kanpur, Uttar Pradesh, India
| | - Ramesh Chowdhary
- Department of Prosthodontics, Rajarajeswari Dental College and Hospital, Bengaluru, Karnataka, India
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Ercal P, Taysi AE, Ayvalioglu DC, Eren MM, Sismanoglu S. Impact of peri-implant bone resorption, prosthetic materials, and crown to implant ratio on the stress distribution of short implants: a finite element analysis. Med Biol Eng Comput 2021; 59:813-824. [PMID: 33728596 DOI: 10.1007/s11517-021-02342-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 03/04/2021] [Indexed: 11/27/2022]
Abstract
The purpose of this study was to determine the effects of prosthetic materials and crown/implant (C/I) ratio on short implants with a marginal bone resorption. Three-dimensional finite element analysis was used to simulate stress distribution under static loading in non-resorption and resorption scenarios (3-mm vertical bone loss) in implants restored with single crowns and C/I ratios of 1:1, 1.5:1, and 2:1 were evaluated. Different crown materials were used: porcelain-fused to metal, porcelain-fused to zirconia, monolithic zirconia, and zirconia-based crown veneered with indirect composite resin. The C/I ratio, the peri-implant bone resorption, and the loading conditions were the key factors affecting the generated stress in short implants. In non-resorption models, von Mises stress ranged between 50 and 105 MPa whereas in resorption models, the values ranged from 168 to 322 MPa, both increasing with the higher C/I ratio under oblique forces. Under axial loading, the C/I ratio did not influence the stress values as the presence of resorption was the only parameter increasing, 57 MPa for the non-resorption models and 101 MPa for the resorption models, respectively. Preference of a prosthetic material was ineffective on the distribution of stress in the bone and implant structure under static loading in any models. The peri-implant bone resorption and a higher C/I ratio in short implants increase the stress values under both axial and oblique forces, whereas the crown material does not influence stress distribution in the surrounding bone and implant structure.
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Affiliation(s)
- Pinar Ercal
- Department of Oral Surgery, Faculty of Dentistry, Altinbas University, Incirli cd. No:11, 34147, Bakirkoy, Istanbul, Turkey.
| | - Aysegul Erten Taysi
- Department of Oral Surgery, Faculty of Dentistry, Altinbas University, Incirli cd. No:11, 34147, Bakirkoy, Istanbul, Turkey
| | - Demet Cagil Ayvalioglu
- Department of Prosthetic Dentistry, Faculty of Dentistry, Altinbas University, Incirli cd. No:11, 34147, Bakirkoy, Istanbul, Turkey
| | - Meltem Mert Eren
- Department of Restorative Dentistry, Faculty of Dentistry, Altinbas University, Incirli cd. No:11, 34147, Bakirkoy, Istanbul, Turkey
| | - Soner Sismanoglu
- Department of Restorative Dentistry, Faculty of Dentistry, Altinbas University, Incirli cd. No:11, 34147, Bakirkoy, Istanbul, Turkey
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13
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Marcián P, Borák L, Zikmund T, Horáčková L, Kaiser J, Joukal M, Wolff J. On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems. J Mech Behav Biomed Mater 2021; 117:104393. [PMID: 33647729 DOI: 10.1016/j.jmbbm.2021.104393] [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: 07/23/2020] [Revised: 01/12/2021] [Accepted: 02/10/2021] [Indexed: 02/06/2023]
Abstract
Patient-specific approach is gaining a wide popularity in computational simulations of biomechanical systems. Simulations (most often based on the finite element method) are to date routinely created using data from imaging devices such as computed tomography which makes the models seemingly very complex and sophisticated. However, using a computed tomography in finite element calculations does not necessarily enhance the quality or even credibility of the models as these depend on the quality of the input images. Low-resolution (medical-)CT datasets do not always offer detailed representation of trabecular bone in FE models and thus might lead to incorrect calculation of mechanical response to external loading. The effect of image resolution on mechanical simulations of bone-implant interaction has not been thoroughly studied yet. In this study, the effect of image resolution on the modeling procedure and resulting mechanical strains in bone was analyzed on the example of cranial implant. For this purpose, several finite element models of bone interacting with fixation-screws were generated using seven computed tomography datasets of a bone specimen but with different image resolutions (ranging from micro-CT resolution of 25 μm to medical-CT resolution of 1250 μm). The comparative analysis revealed that FE models created from images of low resolution (obtained from medical computed tomography) can produce biased results. There are two main reasons: 1. Medical computed tomography images do not allow generating models with complex trabecular architecture which leads to substituting of the intertrabecular pores with a fictitious mass; 2. Image gray value distribution can be distorted resulting in incorrect mechanical properties of the bone and thus in unrealistic or even completely fictitious mechanical strains. The biased results of calculated mechanical strains can lead to incorrect conclusion, especially when bone-implant interaction is investigated. The image resolution was observed not to significantly affect stresses in the fixation screw itself; however, selection of bone material representation might result in significantly different stresses in the screw.
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Affiliation(s)
- Petr Marcián
- Institute of Solid Mechanics, Mechatronics and Biomechanics, Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic
| | - Libor Borák
- Institute of Solid Mechanics, Mechatronics and Biomechanics, Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic.
| | - Tomáš Zikmund
- CEITEC - Central European Institute of Technology, Brno University of Technology, Czech Republic
| | - Ladislava Horáčková
- Department of Anatomy, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jozef Kaiser
- CEITEC - Central European Institute of Technology, Brno University of Technology, Czech Republic
| | - Marek Joukal
- Department of Anatomy, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jan Wolff
- Department of Oral and Maxillofacial Surgery, Division for Regenerative Orofacial Medicine, University Hospital Hamburg-Eppendorf, Hamburg, Germany; Fraunhofer Research Institution for Additive Manufacturing Technologies IAPT, Hamburg, Germany
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Fiorillo L, Musumeci G. TMJ Dysfunction and Systemic Correlation. J Funct Morphol Kinesiol 2020; 5:E20. [PMID: 33467236 PMCID: PMC7739301 DOI: 10.3390/jfmk5010020] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 02/20/2020] [Indexed: 12/16/2022] Open
Abstract
In recent years it has been conclusively shown how the position of the mouth in relation to the body affects the way of walking and standing. In particular, occlusion, the relationship between skull and jaw, swallowing and convergence of the eyes are in neuro-muscular relationship with the control and maintenance system of posture, integrating at different levels. This manuscript aims to be a summary of all the oral, occlusal and articular dysfunctions of TMJ with systemic and postural-muscular repercussions. Recent articles found in the literature that are taken into consideration and briefly analyzed represent an important starting point for these correlations, which are still unclear in the medical field. Posturology, occlusal and oral influences on posture, spine and muscular system are still much debated today. In the literature, there are articles concerning sports performance and dental occlusion or even the postural characteristics of adolescents or children in deciduous and mixed dentition. The temporomandibular joint, as the only joint of the skull, could therefore represent a site to pay particular attention to, and in some cases an ATM dysfunction could be a clue for the diagnosis of systemic pathologies, or it could be the repercussion.
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Affiliation(s)
- Luca Fiorillo
- Department of Biomedical and Dental Sciences, Morphological and Functional Images, University of Messina, 98100 Messina ME, Italy
| | - Giuseppe Musumeci
- Department of Biomedical and Biotechnological Sciences, Anatomy, Histology and Movement Sciences Section, School of Medicine, University of Catania, Via Santa Sofia 87, 95123 Catania, Italy;
- Research Center on Motor Activities (CRAM), University of Catania, Via Santa Sofia 97, 95123 Catania, Italy
- Department of Biology, Sbarro Institute for Cancer Research and Molecular Medicine, College of Science and Technology, Temple University, Philadelphia, PA 19122, USA
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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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Cicciù M. Bioengineering Methods of Analysis and Medical Devices: A Current Trends and State of the Art. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E797. [PMID: 32050530 PMCID: PMC7040794 DOI: 10.3390/ma13030797] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 02/08/2020] [Indexed: 12/12/2022]
Abstract
Implantology, prosthodontics, and orthodontics in all their variants, are medical and rehabilitative medical fields that have greatly benefited from bioengineering devices of investigation to improve the predictability of clinical rehabilitations. The finite element method involves the simulation of mechanical forces from an environment with infinite elements, to a simulation with finite elements. This editorial aims to point out all the progress made in the field of bioengineering and medicine. Instrumental investigations, such as finite element method (FEM), are an excellent tool that allows the evaluation of anatomical structures and any facilities for rehabilitation before moving on to experimentation on animals, so as to have mechanical characteristics and satisfactory load cycle testing. FEM analysis contributes substantially to the development of new technologies and new materials in the biomedical field. Thanks to the 3D technology and to the reconstructions of both the anatomical structures and eventually the alloplastic structures used in the rehabilitations it is possible to consider all the mechanical characteristics, so that they could be analyzed in detail and improved where necessary.
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Affiliation(s)
- Marco Cicciù
- Department of Biomedical and Dental Sciences and Morphological and Functional Imaging, Messina University, 98122 Messina, Italy
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Prosthetic and Mechanical Parameters of the Facial Bone under the Load of Different Dental Implant Shapes: A Parametric Study. PROSTHESIS 2019. [DOI: 10.3390/prosthesis1010006] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In recent years the science of dental materials and implantology have taken many steps forward. In particular, it has tended to optimize the implant design, the implant surface, or the connection between implant and abutment. All these features have been improved or modified to obtain a better response from the body, better biomechanics, increased bone implant contact surface, and better immunological response. The purpose of this article, carried out by a multidisciplinary team, is to evaluate and understand, through the use also of bioengineering tests, the biomechanical aspects, and those induced on the patient's tissues, by dental implants. A comparative analysis on different dental implants of the same manufacturer was carried out to evaluate biomechanical and molecular features. Von Mises analysis has given results regarding the biomechanical behavior of these implants and above all the repercussions on the patient's tissues. Knowing and understanding the biomechanical characteristics with studies of this type could help improve their characteristics in order to have more predictable oral rehabilitations.
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