Análise in vitro do esmalte dentário, após diferentes métodos de remoção de resina composta residual utilizada para a colagem de bráquetes ortodônticos, em microscopia eletrônica de varredura

Abstract

This study aimed to evaluate, in vitro, the enamel surface after different methods of removing residual resin after debonding of orthodontic brackets of metal. We used 25 human premolar, extracted for orthodontic indication, which had their root portions embedded in acrylic resin in rigid PVC matrix. In all specimens were bonded metallic orthodontic brackets (Edgewise - Morelli) with chemically cured orthodontic resin Super Bond (Ortho Source), according to the manufacturer's guidelines. The specimens were immersed in artificial saliva for 24 hours and then the brackets were removed. The specimens were randomly divided into five groups according to the method of removing residual resin. In group 1 the resin was removed with ultrasoun equipment (Altsonic) in group 2 with tungsten carbide bur (JET) in group 3 with aluminum oxide blaster (white Arkansas stone pear type) in group 4 with plier remover resin and in group 5 with sanding discs (TDV) in descending order of grain. After removing the residual resin specimens had their crowns sectioned with a carborundum disk in transverse and longitudinal, leaving only the buccal surface of the crown to be analyzed in scanning electron microscopy. The results were statistically analyzed by ANOVA and Tukey tests with significance level of 5%. The tungsten carbide bur and aluminum oxide blaster methods were less damaged enamel surfaces, with statistically significant results compared to other methods, leaving the enamel surface satisfactory after residual resin removal.