Estudo in vitro do efeito do clareamento dental na resistência ao microdesgaste abrasivo do esmalte dentário bovino

Abstract

The study aimed to evaluate the abrasive microdesgaste bovine enamel submitted to bleaching. Methods: Samples were submitted to dental bleaching, and their resistance to microdesgaste evaluated by testing microabrasion (Calowear Tester). Bovine incisors in which ninety applied bleaching products in gel form, in enamel, in office bleaching techniques were used. Bleaching products used were: two of domestic origin - Lase Peroxide Sensy (LPS 35) and Lase Peroxide Sensy II (LPS 25); and two foreign origin - Opalescence Xtra Boost (OXB 38) and Opalescence Quick (Q 35) and the following protocols were followed for all bleaching products: 1 - no application (control); 2 - application following the manufacturer\'s guidelines (Application Normal- N); 3 - Applying for a longer time (Exaggerated Application-E). The application of the whitening gel by increasing the number of applications of the products, thus increasing the contact time of the product on the samples. Excessive application aimed to evaluate the effect of secondary bleaching, resistance to abrasive microdesgaste. The wear coefficient (Ks) is inversely proportional to the resistance microdesgaste. Results: Analysis of variance showed that the wear coefficients (Ks) groups showed normal distribution, which allowed the application of the Tukey test, which ranked groups with similar performance as the microdesgaste. The difference between groups was significant * (p = 0.021). The lowest Ks presented by the groups was for the control group (1.21 E-11). The Q 35 E, 25 E LPS, LPS 35 E, 35 N LPS, LPS 25 N, 38 E OXB, groups are equivalent to each other, and when compared to control. Groups OXB 38 N and 35 N OQ, showed no significant differences, but are not equivalent to the control. * (P <0.05). Conclusion: From these results, the technique of tooth whitening in office when performed according to the manufacturer\'s instructions, does not harm the bovine enamel in terms of resistance to abrasive microdesgaste.