Estudo da infiltração marginal em restaurações de resinas compostas para dentes posteriores. Efeito do material, preparo cavitário e condicionamento do esmalte a nível cervical
Marginal leakage of posterior composite resin restoration. The effect of material, cavity design and enamel acid - etching in cervical margin
Araújo, R.M.; Silva Filho, F.P.M.; Mendes, A.J.D.
Rev. odontol. UNESP, vol.19, nÚnico, p.191-201, 1990
Resumo
Foi feito um estudo in vitro, da infiltração marginal a nível cervical de restaurações classe II com as resinas compostas posteriores quimicamente ativada - PIO e fotoativada-P30, em dois tipos de cavidades: convencional e adesiva. Foi verificado, também, o efeito dentinário Scotchbond em todos os grupos experimentais. A infiltração foi evidenciada por meio do corante Rodamina B após ciclagem térmica entre as temperaturas de 10ºC e 50ºC e analisada através de uma lupa Estereoscópica Zeiss (10x). Pelos resultados obtidos, houve infiltração marginal em os todos grupos de dentes estudados, com uma porcentagem menor para as cavidades adesivas, quando se utilizou o condicionamento ácido e a resina P30.
Palavras-chave
Infiltração marginal, resinas compostas posteriores, cavidades, condicionamento ácido
Abstract
The purpose of this "in vitro" study was to investigate the cervical marginal leakage in class II restorations with chemically cured resin (PIO) and light-cured resin (P30) in two types of cavities: conventional and adhesive. The effect of acid-etching in this area was also observed. Dentine adhesive Scotchbond was used in all experimental groups. Leakage was evidenced by Rodamina B dye penetration after thermocycling procedure between 10ºC and 50ºC temperature and analysed by using Zeiss Stereoscopic Magnifying Glass (10 X). According to the results obtained marginal leakage occurred in all experimental groups, with lower percentage for adhesives cavities when enamel acid-etching and light-cured resin P30 was used.
Keywords
Marginalleakage, posterior composite resin, cavity desing, acid etching
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