Avaliou-se clinicamente o efeito do jato de bicarbonato de sódio sob pressão, empregado na profilaxia da superfície de esmalte sadio de dentes permanentes jovens. Trabalhou-se com réplicas positivas, o que permitiu a análise antes e após a realização de tal procedimento. Foram feitas sessenta moldagens da superfície vestibular de incisivos centrais superiores, as quais sofreram um preparo para a análise quantitativa da rugosidade das superfícies de esmalte. A análise quantitativa foi efetuada utilizando-se o programa para computador Diracom-3, que mensura as sombras e penumbras das imagens dos espécimes. Estabeleceram-se três grupos experimentais com vinte crianças que nunca haviam sido submetidas à profilaxia com Profident, as quais foram moldadas em três momentos. Antes do procedimento ou controle (Grupo 1); imediatamente após (Grupo 2); e um mês após o tratamento (Grupo 3). A análise quantitativa dos dados mostrou não haver diferença estatisticamente significante entre os grupos analisados.
The purpose of this study was to evaluate in vitro the effectiveness of the dentin bonding system All Bond 2 associated with Resinomer (Bisco), and of Vitrebond (3M) glass ionomer cement fresh-mixed, both used in the bonded amalgam technique, to prevent short-term microleakage in class II cavities restored with Dispersalloy (Dentsply), an admixed alloy. The control group utilized the Copalite (Cooley & Cooley) varnish. Forty five sound human extracted premolars were used. Class II cavity preparations were made on the mesial and distal surfaces of non-carious teeth, with the gingival margins wall established 1mm under the cementum enamel junction. The specimens were divided randomly into three groups with thirty cavities in each group. The teeth were stored in distilled water for 24 hours and were thermocyled through 500 cycles in distilled water between 5°C and 55°C with a dwell time of 15 seconds. The apices and roots of the teeth were sealed. They were placed in a 37°C bath of 0.5% basic fuchsin dye for 24 hours. The teeth were washed in tap water for 24 hours and cut. The microleakage scores per restoration were averaged and three values of various test groups were subjected to the Kruskal-Wallis and Dunn test at a significance level of p < 0.05. The All Bond 2/Resinomer showed significantly less microleakage at gingival margins than the Vitrebond and Copalite lined to amalgam restorations. The Vitrebond fresh mixed, lined to amalgam restorations, showed significantly less microleakage than the Copalite lined to amalgam restorations.
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