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  • Title: The shear bond strength of acetone and ethanol-based bonding agents to bleached teeth.
    Author: Montalvan E, Vaidyanathan TK, Shey Z, Janal MN, Caceda JH.
    Journal: Pediatr Dent; 2006; 28(6):531-6. PubMed ID: 17249435.
    Abstract:
    PURPOSE: The purpose of this in vitro study was to evaluate the: (1) shear bond strength (SBS) of acetone and ethanol-based bonding agents to composite resin 24 hours after being bleached with 35% hydrogen peroxide; and (2) interface morphology and mode of fracture (IMMF) between composite resin and enamel. METHODS: Forty extracted teeth were randomly assigned into 4 groups: (1) group 1: 35% H2O2 + acetone; (2) group 2: H2O2 + ethanol; (3) group 3: acetone; (4) group 4: ethanol. All teeth were acid etched, bonding agents were applied, and a composite resin stub was bonded and stored again in saline for 24 hours. SBS was determined, and scanning electron microscopy (SEM) was used for IMMF evaluation. RESULTS: SBS was significantly lower in bleached than unbleached teeth (P < .001), but SBS did not differ between the acetone-based or ethanol-based adhesives (P = .55) and bleaching did not interact with adhesive treatment (P = .39). IMMF analysis of the unbleached teeth showed a continuous interface between the resin and enamel. By contrast, bleached teeth showed sparse contact between the resin and enamel and the resin was poorly infiltrated into the enamel surface. CONCLUSION: Morphologic changes in human tooth enamel, 24 hours after bleaching, were associated with a reduction in the shear bond strength of adhesives.
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