Impact of light-curing time and aging on dentin bond strength of methacrylate- and silorane-based restorative systems

Brazilian Journal of Oral Sciences

Anderson Catelan¹  Giulliana Panfiglio Soares¹  Ana Karina Bedran-russo¹  Débora Alves Nunes Leite Lima¹  Giselle Maria Marchi¹  Flávio Henrique Baggio Aguiar¹ 

关键词: dental bonding;    composite resins;    methacrylates;    silorane resins;    polymerization;   

DOI  :  10.1590/1677-3225v13n3a10

来源: SciELO

【 摘 要 】

AIM: To evaluate the impact of different light-curing times on dentin microtensile bond strength of two restorative systems after 24 h and 6 months of water storage. METHODS: Standardized Class II preparations were performed in 56 freshly-extracted human molars (n = 7), restored with methacrylate- or silorane-based restorative systems, and light-cured using a light-emitting diode at 1390 mW/cm2 by the recommended manufacturers' time or double this time. After storage for 24 h at 37 oC, the teeth were sectioned to yield a series of 0.8-mm thick slices. Each slab was trimmed into an hourglass shape of approximately 0.64 mm2 area at the gingival dentin-resin interface. Specimens were tested using universal testing machine at crosshead speed of 0.5 mm/min until failure, after 24 h and 6 months of storage. Data were statistically analyzed by three-way ANOVA and Tukey's test (α = 0.05). RESULTS: The highest bond strength values were recorded for the groups restored with methacrylate system (p<0.001) as well as for extended light-curing time (p = 0.0034). There was no statistically significant difference between 24 h and 6 months storage on bond strength (p>0.05). CONCLUSIONS: Bond strength was influenced by the material and light-curing time, but the 6-month storage did not affect the bond strength of restorations.

【 授权许可】

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