scholarly journals Three-Dimensional Finite Element Analysis of Anterior Two-Unit Cantilever Resin-Bonded Fixed Dental Prostheses

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Filip Keulemans ◽  
Akikazu Shinya ◽  
Lippo V. J. Lassila ◽  
Pekka K. Vallittu ◽  
Cornelis J. Kleverlaan ◽  
...  
Keyword(s):  
Finite Element ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Element Analysis ◽  
Framework Materials ◽  
Dental Prostheses ◽  
Reinforced Composite ◽  
Dimensional Finite Element ◽  
Fixed Dental Prostheses ◽  
Three Dimensional Finite Element

The aim of this study was to evaluate the influence of different framework materials on biomechanical behaviour of anterior two-unit cantilever resin-bonded fixed dental prostheses (RBFDPs). A three-dimensional finite element model of a two-unit cantilever RBFDP replacing a maxillary lateral incisor was created. Five framework materials were evaluated: direct fibre-reinforced composite (FRC-Z250), indirect fibre-reinforced composite (FRC-ES), gold alloy (M), glass ceramic (GC), and zirconia (ZI). Finite element analysis was performed and stress distribution was evaluated. A similar stress pattern, with stress concentrations in the connector area, was observed in RBFDPs for all materials. Maximal principal stress showed a decreasing order: ZI > M > GC > FRC-ES > FRC-Z250. The maximum displacement of RBFDPs was higher for FRC-Z250 and FRC-ES than for M, GC, and ZI. FE analysis depicted differences in location of the maximum stress at the luting cement interface between materials. For FRC-Z250 and FRC-ES, the maximum stress was located in the upper part of the proximal area of the retainer, whereas, for M, GC, and ZI, the maximum stress was located at the cervical outline of the retainer. The present study revealed differences in biomechanical behaviour between all RBFDPs. The general observation was that a RBFDP made of FRC provided a more favourable stress distribution.

Three-Dimensional Finite Element Analysis of Implants with Different Crown-to-Root Ratio and Different High Thread

2014 ◽  
Vol 518 ◽  
pp. 190-195
Author(s):  
Ying Jie Duan ◽  
Ling Chen ◽  
Tao Xiong ◽  
Xing Hua Niu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Geometric Model ◽  
Three Dimensional ◽  
Element Analysis ◽  
Jaw Bone ◽  
Crown Root ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

To compare the strain and stress distribution on jaw bone around the implant with different crown-root and different teeth high in teeth repairing, three-dimensional geometric model of the implant was created and analyzed through UG and finite element analysis software. Model came to workbench software after it was drawn and assembly by 3D mapping software of UG. Given material properties of the model, meshing, boundary conditions and forces applied for analysis. It was Obtained that the size and distribution of stress and strain about jaw bone and implant under different conditions. The influence of jaw bone and implant in different conditions was discussed. The main results of the study are as follows: different implant and crown-root, maximum stress with the crown-root increases, but the maximum stress is placid. Factor in the high thread where the maximum stress with high thread show an inverted "U" shape, the maximum strain with high thread becomes flat.

Three-Dimensional Finite Element Analysis Used to Compare Six Different Methods of Syndesmosis Fixation with 3.5- or 4.5-mm Titanium Screws

2013 ◽  
Vol 103 (3) ◽  
pp. 174-180 ◽  
Author(s):  
Mehmet Serhan Er ◽  
Ozgur Verim ◽  
Levent Altinel ◽  
Suleyman Tasgetiren
Keyword(s):  
Finite Element ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
Computed Tomographic ◽  
Cortical Screw ◽  
Titanium Screws ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Background: Use of thicker and longer (four cortices) screws or of multiple screws seems to be more stable and efficient for syndesmosis fixation. Methods: A three-dimensional finite element model of an ankle was constructed from serial axial sections from an existing two-dimensional computed tomographic image. Constructions of syndesmosis fixation with 3.5-mm single tricortical, 3.5-mm single quadricortical, 3.5-mm double tricortical, 3.5-mm double quadricortical, 4.5-mm single tricortical, and 4.5-mm single quadricortical screws were performed on this model. Physiologic loads approximating those during stance phase normal walking were applied to this ankle system. Stress values on the screws using the six fixation methods were compared. Results: The highest maximum stress was determined over 3.5-mm cortical screws applied as single quadricortical, and the lowest maximum stress was determined over the 4.5-mm cortical screw applied as single quadricortical. Stress on the 3.5-mm single screw with quadricortical application was found to be higher than that with tricortical application and also compared with the 4.5-mm quadricortical screw application. Differences between the 4.5-mm single tricortical and quadricortical screws and between the 3.5-mm single tricortical and 3.5-mm double tricortical screw applications were not significant. Conclusions: Quadricortical application of 3.5-mm single screws and tricortical application of 3.5-mm double cortical screws are not good choices for syndesmosis fixation. If the plan is tricortical application, a 3.5-mm single cortical screw is adequate. If quadricortical application of syndesmosis fixation is planned, a 4.5-mm cortical screw should be used. (J Am Podiatr Med Assoc 103(3): 174–180, 2013)

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