Revista de Odontologia da UNESP
http://revodontolunesp.com.br/article/588017a97f8c9d0a098b483a
Revista de Odontologia da UNESP
Original Article

Shear Bond Strength of Total-Etch and Self-Etching Adhesive Systems to Bovine Dentin

Avaliação da resistência adesiva de um sistema decondicionamento total e um sistema autocondicionante à dentina bovina

Borges, A.B.; Marsílio, A.L.; Rodrigues, J.R.

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Abstract

O objetivo deste estudo foi comparar a efetividade da união de dois sistemas adesivos: um de condicionamento total Scotchbond Multi-Uso Plus (3M/Espe, St. Paul, MN, USA) e outro autocondicionante Etch & Prime 3.0 (Degussa AG, Hanau, Germany) à dentina bovina antes e após a termociclagem. Incisivos bovinos foram embutidos em resina acrílica e suas superfícies vestibulares foram desgastadas até a exposição da dentina. Os espécimes foram divididos em dois grupos, nos quais aplicaram-se os sistemas adesivos e, posteriormente, a resina composta Z100 (3M/Espe, St. Paul, MN, USA) por meio de uma matriz de teflon. Esses grupos foram subdivididos em dois subgrupos (A e B). O subgrupo A foi submetido ao teste de cisalhamento após 24 horas e o subgrupo B recebeu a ciclagem térmica (500 ciclos entre 5°C e 55°C), para depois ser submetido ao teste de cisalhamento. O ensaio mecânico foi realizado em máquina Instron Universal à velocidade de 0,5 mm/min e as interfaces adesivas rompidas foram analisadas em estereomicroscópio. O teste estatístico ANOVA com dois fatores (α = 0,05) revelou que os valores de resistência adesiva não apresentaram diferença estatisticamente significante e que a termociclagem não influenciou a resistência adesiva proporcionada pelos materiais testados. Os grupos Scotchbond Multi-Uso Plus apresentaram predominância de falhas adesivas e os grupos Etch & Prime 3.0 apresentaram maior quantidade de fraturas mistas.

Keywords

Adesivos dentinários, resistência adesiva, termociclagem

Resumo

The aim of this study was to investigate the shear bond strength of two adhesive systems: a total-etch technique Scotchbond Multi-Purpose Plus (3M/Espe, St. Paul, MN, USA) and a self-etching technique Etch & Prime 3.0 (Degussa AG, Hanau, Germany) to bovine dentin, before and after thermo cycling. Bovine incisors were embedded in self-cured resin and labial dentin surfaces were ground with sequential abrasive sand papers. The specimens were divided into two groups to receive the adhesive systems and a composite resin cylinder (Z100 - 3M/Espe, St. Paul, MN, USA) was bonded to the dentinal surface. Each group was subdivided into two subgroups (A and B). The subgroup A was shear tested after 24 hours and the subgroup B was subjected to 500 thermal cycles, between 5°C and 55°C and, then, shear tested. The bond strength was performed on a Universal Instron machine, with a speed of 0.5 mm/min. The failure mode was classified in adhesive, cohesive and mixed. The 2-way ANOVA test (α = 0.05) revealed that there were no significant differences between the bond strength of the two adhesive systems, and that the thermal cycling did not significantly influence the shear bond strength proportioned by the two adhesive systems tested. The Scotchbond Multi-Purpose Plus groups showed predominantly adhesive failures and the Etch & Prime 3.0 groups showed predominantly mixed fractures.

Palavras-chave

Adesivos dentinários, resistência adesiva, termociclagem

References



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