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Type: Artigo de periódico
Title: Straight And Offset Implant Placement Under Axial And Nonaxial Loads In Implant-supported Prostheses: Strain Gauge Analysis.
Author: Abreu, Celina Wanderley
Nishioka, Renato Sussumu
Balducci, Ivan
Consani, Rafael Leonardo Xediek
Abstract: The aim of this in vitro study was to quantify strain development during axial and nonaxial loading using strain gauge analysis for three-element implant-supported FPDs, varying the arrangement of implants: straight line (L) and offset (O). Three Morse taper implants arranged in a straight line and three implants arranged in an offset configuration were inserted into two polyurethane blocks. Microunit abutments were screwed onto the implants, applying a 20 Ncm torque. Plastic copings were screwed onto the abutments, which received standard wax patterns cast in Co-Cr alloy (n = 10). Four strain gauges were bonded onto the surface of each block tangential to the implants. The occlusal screws of the superstructure were tightened onto microunit abutments using 10 Ncm and then axial and nonaxial loading of 30 Kg was applied for 10 seconds on the center of each implant and at 1 and 2 mm from the implants, totaling nine load application points. The microdeformations determined at the nine points were recorded by four strain gauges, and the same procedure was performed for all of the frameworks. Three loadings were made per load application point. The magnitude of microstrain on each strain gauge was recorded in units of microstrain (με). The data were analyzed statistically by two-way ANOVA and Tukey's test (p < 0.05). The configuration factor was statistically significant (p= 0.0004), but the load factor (p= 0.2420) and the interaction between the two factors were not significant (p= 0.5494). Tukey's test revealed differences between axial offset (με) (183.2 ± 93.64) and axial straight line (285.3 ± 61.04) and differences between nonaxial 1 mm offset (201.0 ± 50.24) and nonaxial 1 mm straight line (315.8 ± 59.28). There was evidence that offset placement is capable of reducing the strain around an implant. In addition, the type of loading, axial force or nonaxial, did not have an influence until 2 mm.
Subject: Alveolar Process
Chromium Alloys
Dental Implantation, Endosseous
Dental Implants
Dental Prosthesis Design
Dental Prosthesis, Implant-supported
Dental Stress Analysis
Denture, Partial, Fixed
Stress, Mechanical
Citation: Journal Of Prosthodontics : Official Journal Of The American College Of Prosthodontists. v. 21, n. 7, p. 535-9, 2012-Oct.
Rights: fechado
Identifier DOI: 10.1111/j.1532-849X.2012.00871.x
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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