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Year : 2017  |  Volume : 8  |  Issue : 3  |  Page : 451-458

Influence of bleaching regimen and time elapsed on microtensile bond strength of resin composite to enamel

1 Department of Restorative Dentistry, Gulhane Military Medical Academy, Ankara, Turkey
2 Department of Operative Dentistry, Faculty of Dentistry, Istanbul University, 34093 Capa-Istanbul, Turkey
3 Department of Restorative Dentistry, Faculty of Dentistry, University of Kocaeli, Kocaeli, Turkey

Correspondence Address:
Fulya Toksoy Topcu
Department of Restorative Dentistry, Faculty of Dentistry, Gülhane Military Medical, Etlik, Ankara
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ccd.ccd_234_17

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Objectives: The aim of this study was to evaluate the effects of time elapsed since bleaching and different bleaching regimens on the microtensile bond strength of resin composite to enamel. Methodology: Forty flattened buccal enamel surfaces were divided into four groups: An unbleached (control) group and three bleaching groups. Control group specimens were not subjected to a bleaching regimen (Group 1), while those in the bleaching groups were bleached as follows: opalescence 10% (Group 2), whiteness perfect 16% (Group 3), and whiteness hydrogen peroxide 35% (Group 4). Thereafter, the bleached specimens were divided into three subgroups (n = 4 teeth each) for restoration according to predetermined posttreatment time intervals (immediately, 1 week, and 2 weeks). Bonded specimens were then sectioned and subjected to μTBS testing. The data were analyzed using Kruskal–Wallis and Mann–Whitney U-tests at α = 0.05. Results: There was a significant difference in the μTBS of the resin composite to enamel in groups that were bonded immediately after bleaching and in the control group (P < 0.05). Compared to the control group, the μTBS in Groups 2, 3, and 4 decreased significantly 1-week postbleaching (P < 0.05). No significant difference in μTBS was observed between the bleached and unbleached groups 2 weeks after treatment (P > 0.05). Conclusions: Adhesive restorative procedures could not be performed immediately or after 1 week irrespective of the type or concentration of bleaching system used. Composite restorations on bleached enamel surfaces should be performed after an interval of at least 2 weeks.

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