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

Materials Research

Juliano Fernandes Sassi¹  Andrigo Dos Reis Batista¹  Juliane Cristina Ciccone-nogueira¹  Silmara Aparecida Milori Corona¹  Regina Guenka Palma-dibb¹ 

[1] ,University of São Paulo School of Dentistry Departament of Restorative DentistryRibeirão Preto SP ,Brazil

关键词: enamel;    dentin;    microleakage;    adhesion;    photopolymerization devices;   

DOI  :  10.1590/S1516-14392008000100013

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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