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Lemaire S, Bouby C, Thiebaud F, Berry-Kromer V. Prosthetic framework improvement using lattice structure: A comparative finite element study of a mandibular implant-supported prosthesis. J Mech Behav Biomed Mater 2024; 155:106538. [PMID: 38608345 DOI: 10.1016/j.jmbbm.2024.106538] [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: 01/09/2024] [Revised: 04/02/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
OBJECTIVES An alternative option was proposed regarding the prosthetic rehabilitation of a fully edentulous mandible using only four implants. The aim was to reduce the stiffness of the prosthetic framework. To that end, the alternative option consists of a prosthetic framework optimized with a porous structure. Mechanical differences were analyzed between non-prosthetic mandible and restored mandible either with a conventional bulk titanium framework or with this alternative option. The non-prosthetic mandible corresponds to the mandible in its natural state, without prosthesis. This will be considered as the reference for comparison with restored models (mandible with prosthesis). METHODS Three models are used: the first one is the non-prosthetic mandible, the second one is the restored mandible with conventional bulk titanium prosthetic framework, and the third one is the alternative option. Prosthetic framework was optimized with the use of a lattice structure. A numerical analysis was performed (with Abaqus Standard software®) to obtain the effective parameters corresponding to equivalent homogeneous behavior. In the 3 models, physiological boundary conditions were used, considering the activity of several muscles of the masticatory system during three main tasks of mastication (incisive clenching, maximum intercuspation and unilateral molar clenching). RESULTS Numerical simulations allowed to obtain mandibular global kinematics, local displacement at the bone-implant interface and the state of strain at the bone-implant interface, for each masticatory tasks. For this comparative study, the non-prosthetic mandible model was used as a reference to observe the benefits of using a lattice prosthetic framework compared to a conventional bulk titanium framework. CONCLUSION Compared to conventional titanium framework, the lattice prosthetic one appeared to be more respectful of the natural mandible kinematics, given by the reference model. It also resulted in strain values within the physiological loading range.
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Affiliation(s)
- Samuel Lemaire
- Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, Nancy, F-54500, France.
| | - Céline Bouby
- Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, Nancy, F-54500, France
| | - Frédéric Thiebaud
- Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, Nancy, F-54500, France
| | - Valérie Berry-Kromer
- Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, Nancy, F-54500, France
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Fabris D, Moura JPA, Fredel MC, Souza JCM, Silva FS, Henriques B. Biomechanical analyses of one-piece dental implants composed of titanium, zirconia, PEEK, CFR-PEEK, or GFR-PEEK: Stresses, strains, and bone remodeling prediction by the finite element method. J Biomed Mater Res B Appl Biomater 2021; 110:79-88. [PMID: 34173713 DOI: 10.1002/jbm.b.34890] [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: 02/17/2021] [Revised: 05/22/2021] [Accepted: 06/07/2021] [Indexed: 11/06/2022]
Abstract
This work aimed to assess the biomechanics, using the finite element method (FEM), of traditional titanium Morse taper (MT) dental implants compared to one-piece implants composed of zirconia, polyetheretherketone (PEEK), carbon fiber-reinforced PEEK (CFR-PEEK), or glass fiber-reinforced PEEK (GFR-PEEK). MT and one-piece dental implants were modeled within a mandibular bone section and loaded on an oblique force using FEM. A MT implant system involving a Ti6Al4V abutment and a cp-Ti grade IV implant was compared to one-piece implants composed of cp-Ti grade IV, zirconia (3Y-TZP), PEEK, CFR-PEEK, or GFR-PEEK. Stress on bone and implants was computed and analyzed while bone remodeling prediction was evaluated considering equivalent strain. In comparison to one-piece implants, the traditional MT implant revealed higher stress peak (112 MPa). The maximum stresses on the one-piece implants reached ~80 MPa, regardless their chemical composition. MT implant induced lower bone stimulus, although excessive bone strain was recorded for PEEK implants. Balanced strain levels were noticed for reinforced PEEK implants of which CFR-PEEK one-piece implants showed proper biomechanical behavior. Balanced strain levels might induce bone remodeling at the peri-implant region while maintaining low risks of mechanical failures. However, the strength of the PEEK-based composite materials is still low for long-term clinical performance.
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Affiliation(s)
- Douglas Fabris
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil
| | - José P A Moura
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil.,Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
| | - Márcio C Fredel
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil
| | - Júlio C M Souza
- Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal.,School of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, Gandra PRD, 4585-116, Portugal
| | - Filipe S Silva
- Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
| | - Bruno Henriques
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil.,Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
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Geramizadeh M, Katoozian H, Amid R, Kadkhodazadeh M. Three-dimensional optimization and sensitivity analysis of dental implant thread parameters using finite element analysis. J Korean Assoc Oral Maxillofac Surg 2018; 44:59-65. [PMID: 29732310 PMCID: PMC5932273 DOI: 10.5125/jkaoms.2018.44.2.59] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 10/29/2017] [Accepted: 11/20/2017] [Indexed: 11/07/2022] Open
Abstract
Objectives This study aimed to optimize the thread depth and pitch of a recently designed dental implant to provide uniform stress distribution by means of a response surface optimization method available in finite element (FE) software. The sensitivity of simulation to different mechanical parameters was also evaluated. Materials and Methods A three-dimensional model of a tapered dental implant with micro-threads in the upper area and V-shaped threads in the rest of the body was modeled and analyzed using finite element analysis (FEA). An axial load of 100 N was applied to the top of the implants. The model was optimized for thread depth and pitch to determine the optimal stress distribution. In this analysis, micro-threads had 0.25 to 0.3 mm depth and 0.27 to 0.33 mm pitch, and V-shaped threads had 0.405 to 0.495 mm depth and 0.66 to 0.8 mm pitch. Results The optimized depth and pitch were 0.307 and 0.286 mm for micro-threads and 0.405 and 0.808 mm for V-shaped threads, respectively. In this design, the most effective parameters on stress distribution were the depth and pitch of the micro-threads based on sensitivity analysis results. Conclusion Based on the results of this study, the optimal implant design has micro-threads with 0.307 and 0.286 mm depth and pitch, respectively, in the upper area and V-shaped threads with 0.405 and 0.808 mm depth and pitch in the rest of the body. These results indicate that micro-thread parameters have a greater effect on stress and strain values.
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Affiliation(s)
- Maryam Geramizadeh
- Department of Biomechanical Engineering, Amirkabir University, Tehran, Iran
| | | | - Reza Amid
- Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mahdi Kadkhodazadeh
- Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Histochemical examination on the peri-implant bone with early occlusal loading after the immediate placement into extraction sockets. Histochem Cell Biol 2018; 149:433-447. [DOI: 10.1007/s00418-018-1644-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/30/2018] [Indexed: 01/20/2023]
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Abstract
PURPOSE To investigate the effect of implant diameter on fatigue strength using static and cyclic load test. MATERIALS AND METHODS Four different implant systems-SuperLine (Φ4.0), NRLine (Φ3.1), SlimLine (Φ2.8, Φ2.3), and (Dentium)-were grouped by implant diameter. A static load test was conducted with 5 specimens for each group using a universal testing machine to measure the ultimate failure load (UFL). With 80% of the UFL in the weakest group, the starting load for a cyclic load test was determined and the test was performed with 8 specimens for each group. All tests were conducted according to ISO14801 (2007) until implant failure occurred. After dynamically loaded, each specimen was sectioned and stereo-microscopically examined. The failure modes of each implant system were classified. Static and cyclic load test data were respectively analyzed after the test of normality, with the level of significance at P = 0.05. RESULTS In the static load test, the higher maximum load of the standard-diameter implant was significant compared with the recorded narrow or mini-implants (P < 0.05). The yield strengths of the Φ2.8 and Φ3.1 implants were significantly greater than that of the Φ2.3 implant (P < 0.05). In a cyclic load test, the mean number of cycles until implant failure occurred was recorded for each specimen. The value for the Φ4.0 implant was significantly greater (P < 0.001). CONCLUSION Implant diameter has an effect on the ability to withstand both static and cyclic loads within Dentium implant systems, The UFLs and fatigue cycles decreased as the implants diameter became smaller.
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Numerical Method for the Design of Healing Chamber in Additive-Manufactured Dental Implants. BIOMED RESEARCH INTERNATIONAL 2017; 2017:1970680. [PMID: 28293628 PMCID: PMC5331164 DOI: 10.1155/2017/1970680] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 12/13/2016] [Accepted: 01/11/2017] [Indexed: 01/22/2023]
Abstract
The inclusion of a healing chamber in dental implants has been shown to promote biological healing. In this paper, a novel numerical approach to the design of the healing chamber for additive-manufactured dental implants is proposed. This study developed an algorithm for the modeling of bone growth and employed finite element method in ANSYS to facilitate the design of healing chambers with a highly complex configuration. The model was then applied to the design of dental implants for insertion into the posterior maxillary bones. Two types of ITI® solid cylindrical screwed implant with extra rectangular-shaped healing chamber as an initial design are adopted, with which to evaluate the proposed system. This resulted in several configurations for the healing chamber, which were then evaluated based on the corresponding volume fraction of healthy surrounding bone. The best of these implants resulted in a healing chamber surrounded by around 9.2% more healthy bone than that obtained from the original design. The optimal design increased the contact area between the bone and implant by around 52.9%, which is expected to have a significant effect on osseointegration. The proposed approach is highly efficient which typically completes the optimization of each implant within 3–5 days on an ordinary personal computer. It is also sufficiently general to permit extension to various loading conditions.
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Simulated bone remodeling around tilted dental implants in the anterior maxilla. Biomech Model Mechanobiol 2015; 15:701-12. [DOI: 10.1007/s10237-015-0718-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 08/05/2015] [Indexed: 12/19/2022]
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Wang C, Fu G, Deng F. Difference of natural teeth and implant-supported restoration: A comparison of bone remodeling simulations. J Dent Sci 2015. [DOI: 10.1016/j.jds.2014.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Heinemann F, Hasan I, Bourauel C, Biffar R, Mundt T. Bone stability around dental implants: Treatment related factors. Ann Anat 2015; 199:3-8. [PMID: 25770887 DOI: 10.1016/j.aanat.2015.02.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 02/10/2015] [Accepted: 02/11/2015] [Indexed: 11/15/2022]
Abstract
The bone bed around dental implants is influenced by implant and augmentation materials, as well as the insertion technique used. The primary influencing factors include the dental implant design, augmentation technique, treatment protocol, and surgical procedure. In addition to these treatment-related factors, in the literature, local and systemic factors have been found to be related to the bone stability around implants. Bone is a dynamic organ that optimises itself depending on the loading condition above it. Bone achieves this optimisation through the remodelling process. Several studies have confirmed the importance of the implant design and direction of the applied force on the implant system. Equally dispersed strains and stresses in the physiological range should be achieved to ensure the success of an implant treatment. If a patient wishes to accelerate the treatment time, different protocols can be chosen. However, each one must consider the amount and quality of the available local bone. Immediate implantation is only successful if the primary stability of the implant can be provided from residual bone in the socket after tooth extraction. Immediate loading demands high primary stability and, sometimes, the distribution of mastication forces by splinting or even by inserting additional implants to ensure their success. Augmentation materials with various properties have been developed in recent years. In particular, resorption time and stableness affect the usefulness in different situations. Hence, treatment protocols can optimise the time for simultaneous implant placements or optimise the follow-up time for implant placement.
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Affiliation(s)
- Friedhelm Heinemann
- Department of Prosthodontics, Gerodontology and Biomaterials, University of Greifswald, Rotgerberstr. 8, 17489 Greifswald, Germany.
| | - Istabrak Hasan
- Endowed Chair of Oral Technology, Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Christoph Bourauel
- Endowed Chair of Oral Technology, Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Reiner Biffar
- Department of Prosthodontics, Gerodontology and Biomaterials, University of Greifswald, Rotgerberstr. 8, 17489 Greifswald, Germany
| | - Torsten Mundt
- Department of Prosthodontics, Gerodontology and Biomaterials, University of Greifswald, Rotgerberstr. 8, 17489 Greifswald, Germany
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Hasan I, Dominiak M, Blaszczyszyn A, Bourauel C, Gedrange T, Heinemann F. Radiographic evaluation of bone density around immediately loaded implants. Ann Anat 2014; 199:52-7. [PMID: 24690291 DOI: 10.1016/j.aanat.2014.02.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 02/25/2014] [Accepted: 02/28/2014] [Indexed: 10/25/2022]
Abstract
Understanding the changes in bone density after insertion of dental implants and their relation to immediate loading is essential to achieving improvements in their survival rate. Histological investigations of the bone bed in humans are limited, which in turn hampers opportunities to deepen knowledge about the remodelling process around dental implants. The aim of the present study was to follow the change in bone density by measuring the grey values of cone beam computed tomography (CBCT) at different periods subsequent to implant insertion. The CBCTs of 20 individual immediately loaded implants were evaluated at three time points: prior to surgery, one month following, and six months after the operation. The grey values were measured at different regions around the implants. Reduction in the grey values was observed with respect to the reference values after one month and six months from implant insertion in the apical, middle, and cervical regions. No correlation was detected either between the change in grey values and drilling method or with the measured primary and secondary stabilities by Osstell ISQ instrument. Cone beam computed tomography can be used as a qualitative method to support clinical follow up and monitor the changes in bone density around implants in critical cases.
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Affiliation(s)
- Istabrak Hasan
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
| | - Marzena Dominiak
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland
| | - Artur Blaszczyszyn
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland
| | - Christoph Bourauel
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Tomasz Gedrange
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland; Department of Orthodontics, Preventive and Pediatric Dentistry, University Dresden, Germany
| | - Friedhelm Heinemann
- Department of Prosthodontics, Gerodontology and Biomaterials, University of Greifswald, Rotgerberstr. 8, 17475 Greifswald, Germany; Private Practice, Im Hainsfeld 29, 51597 Morsbach, Germany
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Hasan I, Bourauel C, Mundt T, Stark H, Heinemann F. Biomechanics and load resistance of small-diameter and mini dental implants: a review of literature. ACTA ACUST UNITED AC 2014; 59:1-5. [DOI: 10.1515/bmt-2013-0092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 11/06/2013] [Indexed: 11/15/2022]
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Biomechanics and load resistance of short dental implants: a review of the literature. ISRN DENTISTRY 2013; 2013:424592. [PMID: 23738085 PMCID: PMC3664491 DOI: 10.1155/2013/424592] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 04/14/2013] [Indexed: 12/02/2022]
Abstract
This paper was aimed to review the studies published about short dental implants. In the focus were the works that investigated the effect of biting forces of the rate of marginal bone resorption around short implants and their survival rates. Bone deformation defined by strain was obviously higher around short implants than the conventional ones. The clinical outcomes of 6 mm short implants after 2 years showed a survival rate of 94% to 95% and lower survival rate (<80%) for 7 mm short implants after 3 to 6 years for single crown restorations. The short implants used for supporting fixed partial prostheses had a survival rate of 98.9%. Short implants can be considered as a good alternative implant therapy to support single crown or partial fixed restorations.
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Wang C, Wang L, Liu X, Fan Y. Numerical simulation of the remodelling process of trabecular architecture around dental implants. Comput Methods Biomech Biomed Engin 2012; 17:286-95. [DOI: 10.1080/10255842.2012.681646] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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