Enamel loss and superficial aspect during bonding and debonding of metallic brackets = Perda de esmalte e aspecto superficial durante colagem e descolagem de bráquetes metálicos

摘要: To evaluate the cumulative enamel loss during bonding and debonding procedures of orthodontic metallic brackets to analyze superficial roughness.  Forty-seven maxillary first premolars were obtained for quantitative qualitative analysis.  For analysis, forty weighed at each stage treatment equivalent thickness was measured. The amount tooth mass in divided by density value obtain corresponding volume lost. Subsequently, these volumes a circular area with diameter 7 mm, thus obtaining loss. They assessed under following conditions: as sound enamel, after acid conditioning, removal residual resin composite, final polishing high or low-speed, without water refrigeration. A rugosimeter used graphic registration roughness before conditioning. data analyzed Quantikov software Shapiro Wilk’s Wilcoxon statistical tests roughness. one-way ANOVA followed Bonferroni Post-Hoc loss.  scanning electron microscopy (SEM) surfaces performed on seven premolars, one step. Acid conditioning significantly increased surface (p<0.01). Based dental evaluation, statistically significant all stages However, when 4 different methods compared, no differences registered regarding mineralized structure (p=0.72). SEM analysis revealed that tungsten-carbide bur refrigeration low-speed rubber points caused less damage enamel. greatest due losses relative abrasion composite protocols similar. Finally, none restored their original aspects brackets.