Document Type : مقاله‌های پژوهشی

Abstract

Introduction: After fixed orthodontic treatment, it is necessary to remove residual resin. Currently, no technique removes composite resin remnants without affecting the enamel surface. The aim of this study was to evaluate enamel surface roughness after removal of composite resin remnants with two different methods.
Materials & Methods: A total of 12 premolars were embedded in acrylic resin with their buccal surface out of the acrylic resin. The baseline roughness of the buccal surface enamel was evaluated by a profilometer and the three surface parameters (Rt, Rq and Ra) were recorded.  Composite resin was bonded on the mid-buccal enamel surface in two equal and distinct parts on the right (Tc) and left (Fg) sides. TC composite resin was removed with tungsten carbide bur in a low-speed handpiece and Fg composite resin was removed with fiberglass epoxy resin bur in a low-speed handpiece. The surface roughness was evaluated again and the three parameters were recorded. Data were analyzed with one-way ANOVA using SPSS 21 (α = 0.05).
Results: Analysis of parameters Ra (average roughness) and Rq (root mean square) indicated significant differences between Fg and  pre-bonding  surface with the least value (p value < 0.001); in addition, there were significant differences between Tc and pre-bonding surfaces with the highest value (p value < 0.001). In relation to Rt (maximum roughness depth), there were no significant differences between Fg and pre-bonding surfaces (p value > 0.05); however, the differences were significant in relation to Tc surface (p value < 0.001).
Conclusion: Fiberglass and tungsten carbide burs created less and more enamel surface roughness, respectively, compared to pre-bonding conditions.
Key words: Dental enamel, Epoxy resin, Tungsten carbide.