Photoelastic Analysis of Stresses Transmitted by Universal Cast to Long Abutment on Implant-Supported Single Restorations Under Static Occlusal Loads

Author(s)

de Aguiar, Fabio Afranio, Jr. ; Tiossi, Rodrigo ; Macedo, Ana Paula ; Chiarello de Mattos, Maria da Gloria ; Ribeiro, Ricardo Faria ; Silveira Rodrigues, Renata Cristina

• Document type: Journal article
• Source: JOURNAL OF CRANIOFACIAL SURGERY; v. 23, p. 5-pg., 2012-11-01.

Abstract

Objectives: The aim of this study was to compare the stresses resulting from cemented or screw-retained dental prostheses using universal cast to long abutment by the photoelastic method. Material and Methods: A photoelastic resin model was fabricated to simulate a segment of the mandibular arch with resin replicas of a first premolar and a second molar, and two 3.75 x 11-mm implants replacing the second premolar and the first molar. Vertical static loads were individually applied on the occlusal surface of the premolar and the molar (5 kgf) and simultaneously on both crowns (10 kgf). Results: Results found variable stress patterns around each implant and concentrated stresses in the individually loaded crowns. Force transfer characteristics of each situation and quantification of the isochromatic fringes were evaluated. Conclusions: Within the limitations of this study and based on the results obtained for implant-supported prosthesis with internal hexagon connection/universal cast to long abutment, it could be concluded that single adjacent screw-retained prosthetic restorations lead to higher stresses around the implants when compared with cement-retained restorations. (AU)

• FAPESP's process: 08/06960-8 - Photoelastic stress analysis for internal hex connection implants/UCLA abutments under static occlusal loading schemes.
• Grantee: Fabio Afrânio de Aguiar Junior
• Support Opportunities: Scholarships in Brazil - Master