Influência do uso de um primer na microinfiltração em dentina desproteinizada
Primer influence on microleakage in deproteinized dentin
Torres, C.R.G.; Silva, A.P.
Rev. odontol. UNESP, vol.35, n1, p.7-13, 2006
Resumo
O objetivo deste estudo foi testar a hipótese de nulidade de que o uso de um primer num substrato dental condicionado e desproteinizado não teria influência na microinfiltração marginal. Para tal, 60 incisivos bovinos receberam preparos classe V na junção amelo-cementária e foram divididos em dois grupos. No Grupo C foi realizado condicionamento com ácido fosfórico a 35% por 15 segundos, enquanto, no Grupo H, após o condicionamento ácido idêntico ao do Grupo C, foi feita a aplicação de uma solução de NaOCl a 10% por 1 minuto. Cada grupo foi dividido em três subgrupos. No subgrupo PA, foram aplicados o primer e o adesivo do sistema Scotchbond Multipurpose (SBMP); no A foi aplicado apenas o adesivo do SBMP e no MB o adesivo para esmalte Magic Bond. As cavidades foram restauradas com dois incrementos com o compósito Z250. Os dentes foram imersos em água destilada a 37°C por 24 horas e submetidos a 500 ciclos térmicos (5 e 55°C). A microinfiltração foi avaliada quantitativamente pelo método do nitrato de prata seguido pela diafanização. Os dados foram submetidos à análise de variância a dois fatores e teste de Tukey (α = 5%). Foram observadas diferenças significativas apenas para o fator tipo de adesivo. As médias (± desvio padrão) observadas para cada tipo de adesivo foram: PA: 1,10 (± 0,54)a; A: 3,15 (± 1,50)b; MB: 3,74 (± 1,04)b. Os grupos acompanhados de letras iguais não apresentaram diferenças significantes. Concluiu-se que o uso do primer sobre o substrato dentinário desproteinizado melhorou o selamento marginal e que a desproteinização não teve influência sobre a microinfiltração marginal.
Palavras-chave
Infiltração dentária, dentina, hipoclorito de sódio, colágeno
Abstract
The aim of this study was to test the nullity hypothesis that the use of a primer in an acid etched and deproteinized dentin substratum would not have significant influence on microleakage. Sixty incisive bovine teeth received class V preparations at the cementoenamel junction and were assigned into two groups. In the group C the acid etching was performed with 35% phosphoric acid for 15 seconds, while in the group H, after being acid etched in the same way as the group C, an application of a 10% NaOCl solution was carried out for 1 min. Each group was divided into 3 subgroups. In the subgroup PA, the primer and the adhesive of the Scotchbond Multipurpose adhesive system (SBMP) were applied. In the subgroup B, only the adhesive of the SBMP was applied. In the subgroup MB, the enamel adhesive Magic Bond was applied. The cavities were restored with 2 increments of Z250 composite. The teeth were immersed in distilled water at 37°C for 24 hours and submitted to 500 thermal cycles (5 and 55°C). The microleakage was evaluated quantitatively by the silver nitrate method followed by clearing. The data were submitted to two-way ANOVA and Tukey’s test (α = 5%). Significant differences were only observed for the factor adhesive type. The mean (± standard deviation) observed for each adhesive type were: PA: 1.10 (± 0.54)a; A: 3.15(± 1.50)b; MB:3.74(± 1.04)b. The groups accompanied by the same letters do not present significant differences. We concluded that the use of the primer on the deproteinized dentin substratum improved the marginal sealing and that the deproteinization did not influence the marginal microleakage.
Keywords
Dental leakage, dentin, sodium hypochlorite, collagen
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