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Effect of nonvital bleaching with 10% carbamide peroxide on sealing ability of resin composite restorations
Author(s) -
Türkün M.,
Türkün L. Ş.
Publication year - 2004
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2004.00760.x
Subject(s) - carbamide peroxide , dentistry , resin composite , sodium ascorbate , composite number , adhesive , peroxide , materials science , chemistry , composite material , medicine , enamel paint , ascorbic acid , food science , organic chemistry , layer (electronics)
Aim To (i) determine the effect of nonvital bleaching with 10% carbamide peroxide on the sealing ability of resin composite restorations bonded with a self‐etching adhesive system; and (ii) compare the effects of antioxidant treatment and delayed restoration after bleaching on marginal seal. Methodology Forty‐eight noncarious maxillary incisors were divided into four groups ( n = 12) after conventional root canal treatment was completed. In group 1, access cavities were restored with a self‐etching adhesive system and resin composite. In the remaining three groups, 10% carbamide peroxide bleaching gel was placed into the access cavities for periods of 8 h per day for 1 week. They were then restored in the same manner as group 1. Group 2 consisted of specimens restored immediately after bleaching. Group 3 specimens were treated with the antioxidant, 10% sodium ascorbate, whereas group 4 specimens were immersed in artificial saliva for 1 week before restoration. Ten specimens in each group were then subjected to dye leakage; the remaining 2 specimens were examined in a SEM (Jeol/JSM 5200, Tokyo, Japan). The dye penetration was assessed with the standard scoring system. Statistical analysis was carried out using the Kruskal–Wallis and the Mann–Whitney tests. Results Groups 1, 3 and 4 exhibited similar leakage patterns and significantly less leakage than group 2 ( P < 0.0083). SEM examination of groups 1, 3 and 4 specimens demonstrated close adaptation of resin composite to cavity walls, whereas group 2 specimens did not. Conclusion Nonvital bleaching with 10% carbamide peroxide adversely affected the immediate sealing ability of resin composite restoration; both 10% sodium ascorbate treatment and a 1‐week delay in restoration following bleaching improved the reduced sealing ability of resin composite.