Influence of light-curing unit systems on shear bond strength and marginal microleakage of composite resin restorations

Author(s)

Juliano Fernandes Sassi ^[1] ; Andrigo dos Reis Batista ^[2] ; Juliane Cristina Ciccone-Nogueira ^[3] ; Silmara Aparecida Milori Corona ^[4] ; Regina Guenka Palma-Dibb ^[5]

Affiliation

^[1] University of São Paulo. School of Dentistry. Departament of Restorative Dentistry - Brasil

^[2] University of São Paulo. School of Dentistry. Departament of Restorative Dentistry - Brasil

^[3] University of São Paulo. School of Dentistry. Departament of Restorative Dentistry - Brasil

^[4] University of São Paulo. School of Dentistry. Departament of Restorative Dentistry - Brasil

^[5] University of São Paulo. School of Dentistry. Departament of Restorative Dentistry - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 11, n. 1, p. 69-73, 2008-03-00.

Abstract

The aim of the present study was to evaluate the influence of different photopolymerization (halogen, halogen soft-start and LED) systems on shear bond strength (SBS) and marginal microleakage of composite resin restorations. Forty Class V cavities (enamel and dentin margins) were prepared for microleakage assessment, and 160 enamel and dentin fragments were prepared for the SBS test, and divided into 4 groups. Kruskal-Wallis and Wilcoxon tests showed statistically significant difference in microleakage between the margins (p < 0.01) with incisal margins presenting the lowest values. Among the groups, it was observed that, only at the cervical margin, halogen soft-start photo polymerization presented statistically significant higher microleakage values. For SBS test, ANOVA showed no statistical difference (p > 0.05) neither between substrates nor among groups. It was concluded that Soft-Start technique with high intensity end-light influenced negatively the cervical marginal sealing, but the light-curing systems did not influence adhesion. (AU)