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

Photoelastic Stress Analysis in Screwed and Cemented Implant-Supported Dentures With External Hexagon Implants

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Author(s):
Pellizzer, Eduardo Piza [1] ; Tonella, Bianca Piccolotto ; Ferraco, Renato ; Falcon-Antenucci, Rosse Mary ; Perri de Carvalho, Paulo Sergio [2] ; Rosifini Alves-Rezende, Maria Cristina [1]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ, UNESP, Aracatuba Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo - Brazil
[2] Sao Paulo State Univ, UNESP, Aracatuba Sch Dent, Dept Surg & Integrated Clin, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF CRANIOFACIAL SURGERY; v. 21, n. 4, p. 1110-1113, JUL 2010.
Web of Science Citations: 5
Abstract

The aim of this study was to assess the stress distribution of the retention systems (screwed and cemented) for implant-supported fixed partial dentures by means of photoelastic method. Two models were made of photoelastic resin PL-2 with 2 implants (phi = 4.00 x 10 mm) located in the second premolar and molar region in each photoelastic model, varying the retention system (screwed and cemented). The implant-supported fixed partial dentures were standardized and made of Ni-Cr alloy. Axial and oblique (45 degrees) forces of 100 N were applied on the occlusal surface by means of a Universal Testing Machine (EMIC-DL 3000; Sao Jose dos Pinhais, Parana, Brazil). The results were observed and photographed in the field of a circular polariscope and qualitatively analyzed with the aid of computer software (Adobe Photoshop, San Jose, CA). The screw retention system presented the highest number of fringes when the loads were applied on the premolar, pontic, and molar and showed this behavior in all load applications, under axial and oblique loads. It was concluded that there was a better stress distribution and lower magnitude of stress on the cemented implant-supported dentures, under axial and oblique loads. Oblique load caused an increase in stress concentrations in all the models. (AU)