A number of “high power” in-office bleaching products have recently been re-introduced into the market. The usage of such strong oxidizing agents has raised questions as to the possible adverse effects on tooth structure and restorative materials. Objectives: the objective of this study is to evaluate the effects of 35% carbamide peroxide (Opalescence QuickTM) and 35% hydrogen peroxide (Opalescence XtraTM) on the surface finish of four tooth-colored restorative materials (Spectrum TPH, Dyract AP, Reactmer and Fuji II LC). Methods: twenty-seven matrix-finished specimens of each material were fabricated, stored in distilled water at 37ºC for 7 days and randomly divided into three groups. Specimens in Group 1 were stored in distilled water at 37ºC (control). Group 2 and 3 specimens were treated with 35% carbamide peroxide and 35% hydrogen peroxide respectively. A total of three 30-minutes bleaching sessions were carried at one-week intervals. Storage medium during the hiatus period was distilled water at 37ºC. Surface roughness measurements were carried out using profilometry after each bleaching session. Data was analyzed using ANOVA/Scheffe's test at a 0.05 significance level. Results: no significant difference in surface roughness was observed between the bleached and control groups for all materials. Conclusions: In-office bleaching products are not detrimental to the surface finish of composites, compomers, giomers and resin-modified glass ionomer cements.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the IADR/AADR/CADR 80th General Session (March 6-9, 2002)

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