INTRODUCTION: Does the new adhesive-coated APC Flash-Free bracket from the 3M Unitek((R)) group simplify the bonding protocol without compromising precision? OBJECTIVES: The aim of this study was to compare the morphology of the adhesive joint between the classic APC PLUS adhesive-coated brackets and APC Flash-Free brackets. MATERIALS AND METHODS: In vitro bonding of esthetic brackets in the CLARITY ADVANCED range was performed to compare the morphology of the excess flash between APC PLUS and APC Flash-Free brackets. RESULTS: No statistically significant difference was found concerning the morphology of the excess flash between APC PLUS and APC Flash-Free brackets. A statistically significant difference was found regarding the thickness of the adhesive between the two types of bracket. The adhesive used for the APC Flash-Free brackets was significantly thicker than for the APC PLUS brackets (P=0.0001). Adhesive thickness was also more homogeneous on the APC Flash-Free brackets (P=0.001 for the relative difference). CONCLUSION: The adhesive is thicker but adhesive homogeneity is greater with APC Flash-Free brackets than with APC PLUS brackets.
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