2단계 자가 산부식 접착제와 결합된 광중합과 화학중합 복합레진의 법랑질 접착

Abstract

This study was to compare the microshear bond strength (μSBS) of light- and chemical-cured composites to enamel coupled with four 2-step self-etch adhesives and also evaluate the incompatibility between 2-step self-etch adhesives and chemical-cured composite resin. Crown segments of extracted human molars were cut mesiodistally, and 1 mm thickness of specimen was made. They were assigned to four groups by adhesives used: SE group (Clearfil SE Bond), AdheSE group (AdheSE), Tyrian group (Tyrian SPE/One-Step Plus), and Contax group (Contax). Each adhesive was applied to cut enamel surface as per manufacturer's instruction. Light-cured (Filtek Z 250) or chemical-cured composite (Luxacore Smartmix Dual) was bonded to enamel of each specimen using Tygon tube. After storage in distilled water for 24 hours, the bonded specimens were subjected to μSBS testing with a crosshead speed of 1 mm/minute. The mean μSBS (n=20 for each group) was statistically compared using two-way ANOVA, Tukey HSD, and t test at the 0.01 probability level. Also the interface of enamel and composite was evaluated under FE-SEM. The results of this study were as follows; 1. The μSBS of SE Bond group to enamel was significantly higher than that of AdheSE group, Tyrian group, and Contax group in both light-cured and chemical-cured composite resin (p < 0.05). 2. There were not significantly different among AdheSE group, Tyrian group, and Contax group in both light-cured and chemical-cured composite resin. 3. The μSBS of light-cured composite resin was significantly higher than that of chemical-cured composite resin when same adhesive was applied to enamel (p < 0.01). 4. The interface of enamel and all 2-step self-etch adhesives showed close adaptation, and so the incompatibility of chemical-cured composite resin did not showed.