FacebookTwitterDiggGoogle BookmarksRedditLinkedinRSS FeedPinterest
Pin It

Tooth Bleaching and Shear Bond Strength of Composite Resin

A recent study evaluated the influence of various time intervals after tooth bleaching with 35% hydrogen peroxide on the bond strength of resin-based com­posite re­storations. Bitten­court, et al published their findings in the March issue of the Jour­nal of the American Dental Associa­tion
This study in­volved 20 subjects; enamel and dentin blocks were randomly fixed onto the buccal surfaces of posterior maxillary teeth one week prior to bleaching the teeth with 35% hydrogen peroxide. After bleaching, one block of dentin or enamel was re­moved and prepared for bond strength tests according to these time intervals: no bleaching treatment (controls), immediately after bleaching, 7 days after bleach­ing, 14 days after bleaching, and 21 days after bleaching. The study found that there were significant differences be­tween the time intervals (P < .05); shear bond strength values of resin-based composite to enamel and dentin were lower immediately after the bleaching treatment. The authors concluded that 35% hydrogen peroxide reduces the bond strength to enamel and dentin. Clinically, the re­sults of this study suggest that clinicians should allow 7 days to elapse after completion of in-office bleaching with 35% hydrogen peroxide before plac­ing adhesive restorations.

 (Source: Jour­nal of the Amer­ican Dental Association, 2010, Volume 141, Number 3.)

Dentistry Today is The Nation's Leading Clinical News Magazine for Dentists. Here you can get the latest dental news from the whole world quickly.