Influence of different methods of cleaning custom bases on the shear bond strength of indirectly bonded brackets

Abstract Objective: To determine the influence on shear bond strength and bond failure location of four cleaning methods for orthodontic bracket custom bases. Design: In vitro laboratory study. Material and methods: Eighty bovine teeth were divided at random into four groups. The bracket custom bases were cleaned with different methods: group 1 with methyl methacrylate monomer, group 2 with acetone, group 3 with 50 μm aluminium oxide particles and group 4 with detergent. The brackets were indirectly bonded onto the teeth with the Sondhi Rapid-Set self-curing adhesive. The maximum required shear bond strength to debond the brackets was recorded. The bond failure location was evaluated using the Adhesive Remnant Index (ARI). One-way analysis of variance (ANOVA) analysis (P<0·05) was used to detect significant differences in the bond strength. Kaplan–Meier survival plots and log-rank test were done to compare the survival distribution between the groups. The Kruskal–Wallis test (P<0·05) was used to evaluate ...