Influence of bleaching and antioxidant agent on microtensile bond strength of resin based composite to enamel

Publication date: January 2014 Source:The Saudi Journal for Dental Research, Volume 5, Issue 1 Author(s): Fahim Ahmed Vohra , Kamsiah Kasah The purpose of this investigation was to determine the effect of bleaching agent (10% carbamide peroxide) and antioxidant (10% sodium ascorbate) on the microtensile bond strength (μTBS) of resin based composite to enamel. Sixteen extracted human molar teeth were divided into three bleaching groups of 10% carbamide peroxide and an unbleached control group. The specimens in group 1 were bonded immediately after bleaching; group 2 were treated with antioxidant; group 3 were immersed for 3h in distilled water, whereas the unbleached specimens in group 4 had no treatment (control) before bonding. The enamel was etched using 36% phosphoric acid, and was bonded to light polymerized resin composite. The tooth and resin composite assembly was sectioned to produce specimen of 1.0mm2 cross-section. Specimens were subjected to microtensile testing and fractographic analysis using scanning electron microscopy. The data was analyzed using one-way analysis of variance and Tukey–Kramer multiple comparisons test (P =0.05). The specimen bonded immediately after bleaching revealed significantly lower μTBS (22.33±8.46) compared to those of the control group (30.77±8.01). The bleached specimen treated with antioxidant had μTBS (31.27±6.92) similar to the control group. The majority of failures were at the adhesive interface, however the control ...
Source: The Saudi Journal for Dental Research - Category: Dentistry Source Type: research