LOGIN
 
Share Page:
Back

Volume 25 , Issue 2
March/April 2010

Pages 239–246


Stress Patterns on Implants in Prostheses Supported by Four or Six Implants: A Three-Dimensional Finite Element Analysis

Guilherme Carvalho Silva, DDS, MS/José Alfredo Mendonça, DDS, MS, PhD/Luiza Randazzo Lopes/Janés Landre Jr, MechEng, MSc, PhD


PMID: 20369081

Purpose: Using the three-dimensional finite element method (FEM), this study compared the biomechanical behavior of the “All-on-Four” system with that of a six-implant–supported maxillary prosthesis with tilted distal implants. The von Mises stresses induced on the implants under different loading simulations were localized and quantified. Materials and Methods: Three-dimensional models representing maxillae restored with an “All-on-Four” and with a six-implant–supported prosthesis were developed in three-dimensional design software and then transferred into FEM software. The models were subjected to four different loading simulations (full mouth biting, canine disclusion, load on a cantilever, load in the absence of a cantilever). The maximum von Mises stresses were localized and quantified for comparison. Results: In both models, in all loading simulations, the peak stress points were always located on the neck of the distal tilted implant. The von Mises stress values were higher in the “All-on-Four” model (7% to 29%, higher, depending on the simulation). In the presence of a cantilever, the maximum von Mises stress values increased by about 100% in both models. Conclusions: The stress locations and distribution patterns were similar in the two models. The addition of implants resulted in a reduction of the maximum von Mises stress values. The cantilever greatly increased the stress. Int J Oral Maxillofac Implants 2010;25:239–246


Full Text PDF File | Order Article

 

 
Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.

 

© 2014 Quintessence Publishing Co, Inc JOMI Home
Current Issue
Ahead of Print
Archive
Author Guidelines
About
Accepted Manuscripts
Submission Form
Submit
Reprints
Permission
Advertising
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us
Help