Effect of Tooth Bleaching on Bond Strength of Enamel-Dentin Cavities Restored With Silorane- and Dimethacrylate-based Materials

Author(s)

Lima, A. F. ; Sasaki, R. T. ; Araujo, L. S. ; Gaglianone, L. A. ; Freitas, M. S. ^[1] ; Aguiar, F. H. B. ; Marchi, G. M.

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dent Mat Div, Sao Paulo - Brazil

• Document type: Journal article
• Source: Operative Dentistry; v. 36, n. 4, p. 390-396, JUL-AUG 2011.
• Web of Science Citations: 5

Abstract

The aim of this study was to evaluate the influence of tooth bleaching on the push-out bond strength of a composite resin based on dimethacrylates and silorane to cavities that involve both enamel and dentin. A total of 80 bovine incisors were sectioned on the buccal surface to obtain specimens (10 x 10 mm) presenting enamel and dentin (1-mm thick each substrate). The specimens were randomly distributed into eight groups (n=10), according to the bleaching protocol (1 none; 2-10% carbamide peroxide {[}CP] for 21 days, six hours each day; 3 three applications of 35% hydrogen peroxide {[}HP] in 15-minute sessions, one session every seven days for three weeks; 4 10% CP for 18 days, six hours each day + three applications of 35% HP in 15-minute sessions, one session every seven days for three weeks) and the restorative system applied (Adper Single Bond 2 + Filtek Supreme; Filtek Silorane adhesive and composite resin). After treatment, cavities were made (1.2-mm diameter on dentin; 1.5-mm diameter on enamel) with a diamond bur. At 24 hours after restoration, a push-out bond strength test was performed at a crosshead speed of 0.5 mm/min. The bleaching treatments did not significantly affect the bond strengths of either restorative system to enamel-dentin. Regardless of the bleaching treatment, the dimethacrylate-based resin system exhibited significantly higher bond strengths to enamel-dentin than did the silorane-based system. (AU)

• FAPESP's process: 09/08992-7 - Effect of direct and trans-dentinal application of low level laser on odontoblast cells exposed to bleaching agents
• Grantee: Adriano Fonseca de Lima
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/03661-2 - Effect of different volatilization times and temperatures of solvents on degree of conversion and mechanical properties of dentin bonding systems
• Grantee: Larissa Sgarbosa de Araújo Matuda
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 09/03763-0 - Influence of different curing light sources, depth of cure and storage in mechanical properties of different adhesive systems.
• Grantee: Lívia Aguilera Gaglianone
• Support Opportunities: Scholarships in Brazil - Master