Total amount: € 0,00
Online ISSN 1827-174X
Tornavoi D. C. 1, Agnelli J. A. M. 2, Lepri C. P. 3, Mazzetto M. O. 3, Botelho A. L. 3, Soares R. G. 3, Dos Reis A. C. 4
1 School of Dentistry, Ribeirão Preto, São Paulo, Brazil;
2 Department of Material Engineering, Universidade Federal de São Carlos Sorocaba, , São Paulo, Brazil;
3 Department of Restorative Dentistry, School of Dentistry, Ribeirão Preto, São Paulo, Brazil;
4 Department of Dental Materials and Prosthesis, School of Dentistry, Ribeirão Preto, São Paulo, Brazil
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.