Análise do comportamento do coeficiente de desgaste nas diferentes camadas dos Dentes de Resina Acrílica

Abstract

The aim of this study was to analyze the wear behavior of the layers of artificial teeth corresponding to the enamel and dentine by means of micro-abrasive wear with "ballcratering". Upper central incisors of six artificial teeth commercial brands were used to confection of the test specimens (Premium, Magister, Vivodent PE, Biotone, Artiplus IPN e Trilux). The total number of samples was five to each commercial brand. To analyze the artificial teeth wear coefficient, the micro-abrasive wear testing was performed according to Distance sliding (S) and normal Force (N), under conditions of constant N. The wear craters were made without intermediate stops in order to obtain the evolution of craters diameter in accordance to in the experiment duration. The testing times were: 5; 8,33 and 11,66 minutes, the points to the testing execution were chosen randomly. Three repetitions were used for each testing condition. Craters were analyzed with optical microscopes and measurements were taken with the software ©Leica Microsytems. For all analyses data distribution normality and homogeneity were tested. "Analysis of Variance" (ANOVA) 2-factors and Tukey Test to multiple comparisons were calculated from the obtained values in t 3. The lowest and biggest values obtained of k were k=22,60.10 (Ar) and k=47,8.10 (Ma), respectively. In relation to brand factors (p=0.0012) and region (p=0.028) the differences were statistically significant, however regarding to brand x region (p=0.16) there was no significant difference. According to the results, it can be concluded that the behavior of the wear coefficient in all samples, enamel and dentin presented grooving abrasion. Also, it was possible to observe differences in wear behavior of brands of acrylic resin artificial teeth and its layers. The micro-abrasive wear with "ball-cratering" test is appropriate for the study of polymeric materials in Dentistry.