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Effects of different ways of polymerization of an universal adhesive in shear bond strength to dentin
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Resumo(s)
Objectives: The aim of this in vitro study was to understand the influence of the curing mode of an universal adhesive system, applied according to etch-and-rinse (ER) and self-etch (SE) strategies, in the shear bond strength to dentin. Materials and methods: 20 healthy teeth were selected and sectioned in a way that originated 40 specimens. These were randomly distributed in 4 groups: SE independent- pre-curing of the adhesive used with a SE strategy; SE co-polymerization- co-polymerization of the composite and the adhesive used with a SE strategy; ER independent- pre-curing of the adhesive used with an ER strategy; ER co-polymerization- co-polymerization of the composite and the adhesive used with an ER strategy. After 24 h incubation period, the shear bond strength tests were performed. Normality and homogeneity of the data were evaluated by Shapiro-Wilk test and Levene test, respectively, and a one-way ANOVA was used. Results: Specimens from group SE independent yielded the higher shear bond strength values comparing to the values obtained with the specimens from the other groups (p<0,05). Shear bond strength values from specimens of Groups SE co-polymerization, ER independent and ER co-polymerization where not significantly different. The most common failure mode in specimens from group SE independent was mixed, while adhesive failure was prevalent among the other groups. Conclusion: The separate polymerization of the universal adhesive with a SE approach and first layer of composite lead to the best bond strength values to dentin.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2018
Palavras-chave
Materiais dentários Adesivos dentários Polimerização Teses de mestrado - 2018