Effect of mouthguard bleaching on enamel surface
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A Ben-Amar1, R Liberman, C Gorfil
1Department of Operative Dentistry, The Maurice and Gabriela Goldschleger, School of Dental Medicine, Tel Aviv University, Israel.
Purpose:
To evaluate in vitro the effect of 10% carbamide peroxide in a mouthguard on the shear bond strength of resin composite to bleached enamel surfaces and morphological changes in these surfaces.
Materials And Methods:
Thirty anterior extracted were divided into a control and a test group. Plastic trays were made for each tooth and the test group treated with Opalescence bleaching gel and incubated at 37 degrees C humid environment for 8 hours. The bleaching agent was washed and the trays replaced with water-soaked cotton wool for another 16 hours in the incubator. This procedure was repeated every day for 21 days. The control group was just treated with the water-soaked cotton wool. Selected teeth from both groups were evaluated with the SEM and 72 hours after the bleaching treatment, Scotchbond 2/Silux Plus rings were bonded to the enamel surfaces in both groups and sher bond strength testing performed.
Results:
Bleaching created some enamel porosity and significant reduction in the resin composite shear bond strength.