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Braz Dent J (2010) 21(1): 55-59

Polytetrafluoroethylene added to acrylic resins

55 ISSN 0103-6440

Polytetrafluorethylene Added to Acrylic Resins: Mechanical PropertiesFabiana Gouveia STRAIOTO1 Antonio Pedro RICOMINI FILHO1 Alfredo Júlio FERNANDES NETO2 Altair Antoninha DEL BEL CURY1
1Department

of Prosthodontics and Periodontology, Piracicaba DentalSchool, State University of Campinas, Piracicaba, SP, Brazil 2Department of Occlusion, Fixed Prosthodontics and Dental Materials, Federal University of Uberlândia, Uberlândia, MG,Brazil

The addition of different polymers, such as polytetrafluorethylene (PTFE), to denture base resins could be an option to modify acrylic resin mechanical properties. This studyevaluated 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 polymerizationcycle, 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 wereprepared 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 wereanalyzed 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. Flexuralstrength, impact strength and peak load were significantly higher (p 2 kJ/m2). However, the impact strength values for the short cycle resin with 2% PTFE were significantly lower (p
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