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The International Journal of Oral & Maxillofacial Implants
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Int J Oral Maxillofac Implants 27 (2012), No. 3     15. June 2012
Int J Oral Maxillofac Implants 27 (2012), No. 3  (15.06.2012)

Online Article, Page 566, PubMed:22616068


Online Article: The Effect of Prosthesis Length and Implant Diameter on the Stress Distribution in Tooth-Implant-Supported Prostheses: A Finite Element Analysis
Assis de Paula, Gustavo / Soares da Mota, Adérito / Moreira, Allyson Nogueira / Silami de Magalhães, Cláudia / Cornacchia, Tulimar Pereira Machado / Cimini jr., Carlos Alberto
Purpose: The goal of this study was to compare the stress distribution of tooth-implant-supported prostheses (TISPs) and solely implant-supported prostheses (ISPs) with two different pontic spans (three units versus four units).
Materials and Methods: Two-dimensional finite element models were constructed from the radiographs of polyester resin casts to mimic TISPs and ISPs. In all, eight models were analyzed. Occlusal loads of 15 N and 30 N were applied to the premolars and molars, respectively. The lateral and inferior borders of the models were constrained, with all degrees of freedom equal to zero. Eight-node elements with plane strain assumption were used for simulation.
Results: The authors found that TISPs with a short span and wider-diameter implants resulted in more homogenous stress distribution and less stress concentration on the implants. The long span yielded higher stress concentrations on the implants and between the pontics.
Conclusions: In all models analyzed, stress concentrations were present in the implants.