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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.)

Polytetrafluorethylene added to acrylic resins: mechanical properties

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Author(s):
Fabiana Gouveia Straioto [1] ; Antonio Pedro Ricomini Filho [2] ; Alfredo Júlio Fernandes Neto [3] ; Altair Antoninha Del Bel Cury [4]
Total Authors: 4
Affiliation:
[1] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[2] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[3] Federal University of Uberlândia. Department of Occlusion, Fixed Prosthodontics and Dental Materials - Brasil
[4] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Dental Journal; v. 21, n. 1, p. 55-59, 2010-01-00.
Abstract

The addition of different polymers, such as polytetrafluorethylene (PTFE), to denture base resins could be an option to modify acrylic resin mechanical properties. This study evaluated the surface hardness, impact and flexural strength, flexural modulus and peak load of 2 acrylic resins, one subjected to a long and another subjected to a short polymerization cycle, which were prepared with or without the addition of 2% PTFE. Four groups were formed according to the polymerization cycle and addition or not of PTFE. Forty specimens were prepared for each test (10 per group) with the following dimensions: hardness (30 mm diameter x 5 mm thick), impact strength (50 x 6 x 4 mm) and flexural strength (64 x 10 x 3.3 mm) test. The results of the flexural strength test allowed calculating flexural modulus and peak of load values. All tests were performed in accordance with the ISO 1567:1999 standard. Data were analyzed statistically by ANOVA and Tukey's test with the level of significance set at 5%. No statistically significant differences (p>0.05) were found for surface hardness. Flexural strength, impact strength and peak load were significantly higher (p<0.05) for resins without added PTFE. The flexural modulus of the acrylic resin with incorporated 2% PTFE polymerized by long cycle was significantly higher (p<0.05) than that of the other resins. Within the limits of this study, it may be concluded that the addition of PTFE did not improve the mechanical properties of the evaluated acrylic resins. (AU)