Summary
Bleaching procedures can interfere on adhesive bonding of methacrylate-based restorative materials. After introduction of silorane-based composites, little information is available about this interaction. The objective is evaluate the influence of bleaching on enamel shear bond strength of silorane-based restorative system. Forty sound incisive bovine teeth were randomly divided into 04 groups (n= 10), being: G1 (control) – not bleached + Clearfil SE Bond (CSEB)/Filtek Z250 (Z250), G2 (control) – not bleached + Silorane Adhesive (SA)/Filtek P90 (P90), G3 – bleached + CSEB/Z250; G4 – bleached + SA/P90. The teeth were sectioned, had crowns included in a PVC rings, and the enamel surfaces gridded and polished with silicon carbide abrasive papers. G1 and G2 were stored in artificial saliva (37 ºC), daily renewed, for a period of 04 days. G3 and G4 were exposed to 02 sessions of 38% hydrogen peroxide (38HP), with 03 applications of 15 min in each session. Composite resin cylinders were built up on the enamel surfaces. Bonding procedures were performed according the manufacturer’s instructions. After storage in distilled water for 24 h (37 ºC), the samples were submitted to shear bond test. Data were analyzed by two-way ANOVA and t (LSD) tests (5%). Intra group comparison showed significant difference for Z250 after bleaching, but not for P90. Shear strength was significant lower for P90, despite bleaching procedures. In conclusion, 38HP bleaching had no influence on the enamel bond strength of P90, even though presenting lower bond strength than Z250.
KEY WORDS: tooth bleaching, composite resins, shear strength.
How to cite this article
MONTEIRO, T. L.; CARNEIRO, N. C. M.; NOGUEIRA, B. C. L.; BRAGA, E. M. F.; SOUZA JÚNIOR, M. H. S. & LORETTO, S. C. Influence of tooth bleaching on the bonding strength of silorane-based restorative system. Int. J. Odontostomat., 9(3):497-504, 2015.
