scholarly journals Number of dental abutments influencing the biomechanical behavior of tooth‒implant-supported fixed partial dentures: A finite element analysis

2020 ◽  
Vol 14 (4) ◽  
pp. 228-234
Author(s):  
Janaina Cordeiro de Oliveira ◽  
Mariane Beatriz Sordi ◽  
Ariadne Cristiane Cabral da Cruz ◽  
Raquel Virgínia Zanetti ◽  
Ederson Aureo Golçalves Betiol ◽  
...  
Keyword(s):  
Finite Element ◽  
Dental Implants ◽  
Lateral Incisor ◽  
Element Analysis ◽  
Second Molar ◽  
Biomechanical Behavior ◽  
Abutment Teeth ◽  
Natural Teeth ◽  
Dental Abutments ◽  
Surrounding Bone

Background. Local or systemic issues might prevent installing a sufficient number of dental implants for fixed prosthetic rehabilitation. Splinting dental implants and natural teeth in fixed dentures could overcome such limitations. Therefore, this study aimed to evaluate the influence of the number of dental abutments in the biomechanics of tooth‒implant-supported fixed partial dentures (FPDs). The null hypothesis was that increasing the number of abutment teeth would not decrease the stress over the abutments and surrounding bone. Methods. Left mandibular lateral incisor, canine, premolars, and molars were reconstructed through computed tomography and edited using image processing software to represent a cemented fixed metal‒ceramic partial denture. Three models were set to reduce the number of abutment teeth: 1) lateral incisor, canine, and first premolar; 2) canine and first premolar; 3) the first premolar. The second premolar and first molar were set as pontics, and the second molar was set as an implant abutment in all the models. Finite element analyses were performed under physiologic masticatory forces with axial and oblique loading vectors. Results. After simulation of axial loads, the stress peaks on the bone around the implant, the bone around the first premolar, and prosthetic structures did not exhibit significant changes when the number of abutment teeth decreased. However, under oblique loads, decreasing the number of abutment teeth increased stress peaks on the surrounding bone and denture. Conclusion. Increasing the number of dental abutments in tooth‒implant-supported cemented FPD models decreased stresses on its constituents, favoring the prosthetic biomechanics.

scholarly journals Biomechanical behavior of overdentures supported by different implant position and angulation using Micro ERA® system

2019 ◽  
Vol 18 ◽  
pp. e191667
Author(s):  
Felipe Franco Ferreira ◽  
Guilherme Almeida Borges ◽  
Letícia Del Rio Silva ◽  
Daniele Valente Velôso ◽  
Thaís Barbin ◽  
...  
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Equivalent Stress ◽  
Lateral Incisor ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Bone Implant ◽  
Implant Position ◽  
Biomechanical Behavior ◽  
Von Mises

Aim: The aim of this study was to investigate the biomechanical behavior of implant-retained mandibular overdentures using Micro ERA® system with different implant position and angulation by finite element analysis (FEA). Methods: Four 3D finite element models of simplified mandibular overdentures were constructed, using one Bränemark implant with a Micro ERA® attachment. The implant was positioned on the canine or lateral incisor area with an angulation of either 0º (C-0º; LI-0º) or 17º (C-17º, LI-17º) to the vertical axis. A 100 N axial load was applied in one side simultaneously, from first premolar to second molar. In all models it was analyzed the overdenture displacement, compressive/tensile stress in the bone-implant interface, and also the von Mises equivalent stress for the nylon component of the housing. The stresses were obtained (numerically and color-coded) for further comparison among all the groups. Results: The displacement on the overdenture was higher at the posterior surface for all groups, especially in the C-17º group. When comparing the compressive/tensile stress in the bone-implant interface, the lateral-incisor groups (LI-0º and LI-17º) had the highest compressive and lowest tensile stress compared to the canine groups (C-0º and C-17º). The von Mises stress on the nylon component generated higher stress value for the LI-0º among all groups. Conclusions: The inclination and positioning of the implant in mandibular overdenture interferes directly in the stress distribution. The results showed that angulated implants had the highest displacement. While the implants placed in the lateral incisor position presented lower compressive and higher tensile stress respectively. For the attachment the canine groups had the lowest stress.

scholarly journals Stress and strain analyses of removable partial denture abutment tooth in relation to the position of the minor connector

2017 ◽  
Vol 145 (9-10) ◽  
pp. 452-456
Author(s):  
Aleksandra Milic-Lemic ◽  
Jelena Eric ◽  
Katarina Radovic ◽  
Saso Elencevski ◽  
Rade Zivkovic ◽  
...  
Keyword(s):  
Finite Element ◽  
Obtuse Angle ◽  
The Finite Element Method ◽  
Removable Partial Denture ◽  
Element Analysis ◽  
Partial Denture ◽  
Optimum Angle ◽  
Biomechanical Behavior ◽  
Study Results ◽  
Abutment Teeth

Introduction/Objective For optimum loading distribution, the angle formed by the occlusal rest and the vertical minor connector from which it originates should be less than 90?. The objective of the article was to visualize the optimum angle between the occlusal rest and the minor connector in terms of intensity and distribution of occlusal loads using finite element analysis. It was the intention, concerning biomechanical behavior, to document that the optimum angle between the occlusal rest and the minor connector should be less than 90?. Methods Three different virtual models of partial edentulous Kennedy III class were created using the CATIA design computer program with different angles between the occlusal rest and the minor connector. Stress distribution after simulated occlusal loading was analyzed using the finite element method. Results Comparing the results obtained for three models, the highest stress values were seen in model 3 (the angle between the occlusal rest and the small connector is greater than 90?) whether the load is applied in the middle or at the end of the saddle. Conclusion Within limitations and on the basis of the study results, the minimum compressive stress was seen in model 1, where the angle between the occlusal rest and the minor connector was less than 90? whether the load is applied in the middle or at the end of the saddle. It is recommended that obtuse angle between the rest and the minor connector should be avoided due to potential hazardous stress concentration on abutment teeth.

scholarly journals 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 ◽  
Vol 14 (22) ◽  
pp. 6974
Author(s):  
Dawit-Bogale Alemayehu ◽  
Yeau-Ren Jeng
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Dental Implants ◽  
Loading Rate ◽  
Bone Structure ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Bone Material ◽  
Surrounding Bone ◽  
Occlusal Load

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.

scholarly journals Three-Dimensional Finite Element Investigation Into Effects of Implant Thread Design and Loading Rate on Stress Distribution in Dental Implants and Anisotropic Bone

2021 ◽  
Author(s):  
Dawit Bogale Alemayehu ◽  
Yeau Ren Jeng
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Dental Implants ◽  
Loading Rate ◽  
Bone Structure ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Bone Material ◽  
Surrounding Bone ◽  
Occlusal Load

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.

The influence of implant body and thread design of mini dental implants on the loading of surrounding bone: a finite element analysis

2017 ◽  
Vol 62 (4) ◽  
pp. 393-405 ◽  
Author(s):  
Arpad Toth ◽  
Istabrak Hasan ◽  
Christoph Bourauel ◽  
Torsten Mundt ◽  
Reiner Biffar ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implants ◽  
Load Transfer ◽  
Alveolar Bone ◽  
Element Analysis ◽  
Attractive Option ◽  
Poor Tolerance ◽  
Group 3 ◽  
Surrounding Bone

AbstractMini dental implants (MDI) were once thought of as transitional implants for treatment in selected clinical situations. Their reduced diameter makes them a very attractive option for patients with poor tolerance to maxillary and mandibular prostheses. Using the method of finite element analysis, a series of different designed MDI prototypes have been investigated. The prototypes differed in the geometry of implant body and/or design of implant head. The load transfer of the implant prototypes to the idealised alveolar bone has been regarded and the prototypes have been compared to each other and to a number of standard commercial implants. The prototype models have been virtually placed in the idealised bone with a cortical thickness of 1.5 mm and loaded laterally 30° from the implant's long axis. The condition of immediate loading was assumed for the numerical analyses through defining a contact interface between the implant and bone bed. The numerical analysis in this study showed that the design of the investigated prototype MDI of group 3 (mini-ball head) is the most advantageous design.

scholarly journals Influence of Ti-6Al-4V and Ti-15Zr Dental Implants on the Stress in Mandibular Bone A finite element analysis study

2019 ◽  
Vol 56 (2) ◽  
pp. 469-473
Author(s):  
Cosmin Dima ◽  
Doriana Agop-Forna ◽  
Sanziana Butnaru Moldoveanu ◽  
Consuela Norina Forna
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implants ◽  
Cancellous Bone ◽  
Complex Geometry ◽  
Implant Design ◽  
Element Analysis ◽  
Mandibular Bone ◽  
Second Molar ◽  
Ceramic Crown

The purpose of our study was to analyze the influence of Ti-6Al-4V and Ti-15Zr dental implants, with complex implant designs, on the cortical and trabecular mandibular bone in regards to the stress value and its distribution using finite element analysis. A total of four 3D implant assemblies were modeled, each consisting of implant, abutment, abutment screw, cement layer, and ceramic crown. Implants were modeled with different macrostructure designs with focus on the main thread and microthread design as well as complex geometry details. All implants were inserted in the second molar position in the mandible bone section, consisting of two macro-structures, a 2 mm thick cortical bone and an internal cancellous bone. Results revealed that small variations in the implant design led to a great difference in the stress values and distribution in both cortical and cancellous bone. Our results suggest no major difference between Ti-6Al-4V and Ti-15Zr in regards to the material�s ability to decrease stress in the periimplant bone. However, within the same material, results revealed important differences between thread design and implant geometry concerning the stress values and stress concentration in cortical and cancellous bone in the mandibular model.

scholarly journals Comparison of one versus two maxillary molars distalization with iPanda: a finite element analysis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Kamontip Sujaritwanid ◽  
Boonsiva Suzuki ◽  
Eduardo Yugo Suzuki
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Alveolar Bone ◽  
Vertical Direction ◽  
Minimal Amount ◽  
Element Analysis ◽  
Molar Distalization ◽  
Second Molar ◽  
Maxillary Molars ◽  
Displacement Patterns

Abstract Background The purpose of this study was to compare the stress distribution and displacement patterns of the one versus two maxillary molars distalization with iPanda and to evaluate the biomechanical effect of distalization on the iPanda using the finite element method. Methods The finite element models of a maxillary arch with complete dentition, periodontal ligament, palatal and alveolar bone, and an iPanda connected to a pair of midpalatal miniscrews were created. Two models were created to simulate maxillary molar distalization. In the first model, the iPanda was connected to the second molar to simulate a single molar distalization. In the second model, the iPanda was connected to the first molar to simulate “en-masse” first and second molar distalization. A varying force from 50 to 200 g was applied. The stress distribution and displacement patterns were analyzed. Results For one molar, the stress was concentrated at the furcation and along the distal surface in all roots with a large amount of distalization and distobuccal crown tipping. For two molars, the stress in the first molar was 10 times higher than in the second molar with a great tendency for buccal tipping and a minimal amount of distalization. Moreover, the stress concentration on the distal miniscrew was six times higher than in the mesial miniscrew with an extrusive and intrusive vector, respectively. Conclusions Individual molar distalization provides the most effective stress distribution and displacement patterns with reduced force levels. In contrast, the en-masse distalization of two molars results in increased force levels with undesirable effects in the transverse and vertical direction.

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