Background: Dental resin composites undergo chemical and mechanical degradation. Thus, the orthodontist should evaluate aged composite restoration surfaces to select the appropriate protocol to successfully bond orthodontics accessories.Objective: This study evaluated the shear bond strength (o) of metal (M) and ceramic (C) brackets bonded to aged resin-based composite restorations (ACR) after different surface treatments. Methods: ACR specimens (N=160) were fabricated and divided into 8 experimental groups (n=20) as follows: Mo (control)- M bonded to ACR; MA- M bonded to ACR after acid etching using 38% phosphoric acid for 20 s (A); MB- M bonded to ACR after surface roughing using a twelve-bladed bur (B); MBA- M bonded to ACR after B and A; Co (control)- C bonded to ACR; CA- C bonded to ACR after A; CB- C bonded to ACR after B; CBA- C bonded to ACR after B and A. All specimens were stored for 24h before a testing. Data were statistically analyzed using one-way ANOVA and Tukey post-hoc (a=0.05). Fracture surfaces were examined to determine the failure mode.
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