Effect of 10% carbamide peroxide dental bleaching on microhardness of filled and unfilled sealant materials

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Data

2006-11-01

Autores

De Alexandre, Rodrigo Sversut
Sundfeld, Renato Herman [UNESP]
Briso, André Luiz Fraga [UNESP]
Bedran-Russo, Ana Karina B.
Valentino, Thiago Assunção
Sundefeld, Maria Lúcia Marçal Mazza [UNESP]

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Purpose: The purpose of this study was to quantitatively evaluate the effect of 10% carbamide peroxide on the microhardness of pit and fissure sealant materials. Methods: Fluroshield, Vitroseal Alfa, and one unfilled (Clinpro) sealants were placed in Teflon matrices (4 mm in diameter by 2 mm in height) and polymerized for 40 seconds. A total of 20 specimens were prepared for each material, in which half were assigned as the control group (stored in artificial saliva and no bleaching treatment). For the remaining half, Clarigel Gold bleaching agent (10% carbamide peroxide) was placed over the specimen surface for 4 hours/day during 4 weeks. When specimens were not under bleaching treatment, they were kept in artificial saliva. Afterwards, specimens were subjected to Knoop microhardness testing using a 25-g load for 5 seconds. Five measurements were made on the sealants' surfaces and then calculated in Knoop hardness values. The data were statistically analyzed by two-way analysis of variance and Tukey's tests with a 5% confidence level. Results: The results of this in vitro study showed that the application of a carbamide peroxide-based bleaching material significantly affected the microhardness values of filled sealant materials. The bleaching agent did not affect the microhardness of the unfilled sealant. CLINICAL SIGNIFICANCE: The results of this in vitro study suggest that the bleaching agents altered the surface hardness of filled sealant restorative materials. This could possibly lead to increased wear and surface roughness. © 2006, Copyright the authors.

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Palavras-chave

drug derivative, fissure sealant, oxidizing agent, peroxide, urea, urea peroxide, chemistry, dental care, drug combination, drug effect, hardness, Drug Combinations, Hardness, Oxidants, Peroxides, Pit and Fissure Sealants, Tooth Bleaching, Urea

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Journal of Esthetic and Restorative Dentistry, v. 18, n. 5, p. 273-278, 2006.