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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses

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Author(s):
Cristiane Ueda [1] ; Roberto Adrian Markarian [2] ; Cláudio Luiz Sendyk [3] ; Dalva Cruz Laganá [4]
Total Authors: 4
Affiliation:
[1] University of São Paulo. School of Dentistry. Department of Prosthodontics
[2] University of São Paulo. School of Dentistry. Department of Prosthodontics
[3] University of São Paulo. School of Dentistry. Department of Prosthodontics - Brasil
[4] University of São Paulo. School of Dentistry. Department of Prosthodontics
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Oral Research; v. 18, n. 1, p. 45-52, 2004-03-00.
Field of knowledge: Health Sciences - Dentistry
Abstract

The longevity of implant-supported prosthetic rehabilitation depends largely on how the masticatory forces are transferred to the implants and surrounding bone. Anatomical conditions, bone morphology and aesthetics usually dictate implant placement in less than ideal positions for prosthetic rehabilitation and sometimes it is possible to find them with different inclinations. The purpose of this paper was to compare, through photoelastic analysis, the stress distribution in a fixed prosthesis with 3 parallel implants, to the stress distribution in the same prosthesis in the existence of an angled central implant. Two photoelastic resin models were made and a polariscope was used in the visualization of isochromatic fringes formed in the models when axial loads of 2 kg, 5 kg and 10 kg were applied to a unique central point of the prosthesis. The presence of inducted tensions (preloads) was observed in the models after applying torque to the retention screws. Preloads were intensified with the incidence of occlusal forces. In the parallel implants, the force dissipation followed the long axis. The angled implant had a smaller quantity of fringes and the stresses were located mostly around the apical region of the lateral implants. (AU)