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Assessment of surface hardness of acrylic resins submitted to accelerated artificial aging

D C Tornavoi¹, J A M Agnelli, C P Lepri

¹School of Dentistry, Ribeirão Preto, São Paulo, Brazil.

Minerva Stomatologica

|June 7, 2012

Abstract

Aim:

The aim of this study was to assess the influence of accelerated artificial aging (AAA) on the surface hardness of acrylic resins.

Methods:

The following three commercial brands of acrylic resins were tested: Vipi Flash (autopolymerized resin), Vipi Wave (microwave heat-polymerized resin) and Vipi Cril (conventional heat-polymerized resin). To perform the tests, 21 test specimens (65x10x3 mm) were made, 7 for each resin. Three surface hardness readings were performed for each test specimen, before and after AAA, and the means were submitted to the following tests: Kolmogorov-Smirnov (P>0.05), Levene Statistic, Two-way ANOVA, Tukey Post Hoc (P<0.05) with the SPSS Statistical Software 17.0.

Results:

The analysis of the factors showed significant differences in the hardness values (P<0.05). Before aging, the autopolymerized acrylic resin Vipi Flash showed lower hardness values when compared with the heat-polymerized resin Vipi Cril (P=0.001). After aging, the 3 materials showed similar performance when compared among them. The Vipi Cril was the only one affected by AAA and showed lower hardness values after this procedure (Pp=0.003).

Conclusion:

It may be concluded that accelerated artificial aging influenced surface hardness of heat-polymerized acrylic resin Vipi Cril.

Keywords:

surface hardness acrylic resins dental materials accelerated aging

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