Evaluation of the shear bond strength of two composites bonded to conditioned surface with self-etching primer

Aim: The aim of this study was to evaluate the shear bond strength and the Adhesive Remnant Index (ARI) between the composites Eagle Bond and Orthobond bonded to an enamel surface conditioned with Transbond Plus Self-Etching Primer. Methods: Seventy-five bovine permanent mandibular incisors, divided into five groups (n=15) were used. In Groups 1, 2 and 4, the bonds were performed with Transbond XT, Orthobond and Eagle Bond respectively, in accordance with the manufacturers’ recommendations. In Groups 3 and 4, before bonding with Orthobond and Eagle Bond, respectively, the tooth surface was conditioned with the acid primer Transbond Plus Self-Etching Primer. After bonding the shear test was performed of all samples at a speed of 0.5 mm per minute in an Instron mechanical test machine. Results: The results (MPa) showed that there were no statistically significant differences among Groups 1, 2, 3 and 5 (p>0.05). However, these groups were statistically superior to Group 4 (p<0.05). The ARI (Adhesive Remnant Index) results showed a higher number of fractures at the bracket/composite interface in Groups 1, 2, 3 and 5. Abstract