법랑질 삭제방향에 따른 각종 접착제의 미세전단 결합강도

Abstract

This study compared the microshear bond strength (μSBS) to end and side of enamel rod of four adhesives including two total etch adhesives and two self-etch adhesives. Crown segments of extracted human molars were cut mesiodistally and 1 mm thickness of specimen was made. The outer buccal and lingual surface were used as specimens cutting the end of enamel prism, and inner slabs used as specimens cutting the side of enamel prism. Each surface was ground with 600 grit silicone carbide paper. They were assigned to four groups by used adhesives: Group 1 (All-Bond 2), Group 2 (Single Bond), Group 3 (Tyrian SPE/One-Step Plus). Group 4 (Adper Prompt L-Pop). Each adhesive was applied to enamel surface as per manufacturer's instruction, and three composite cylinders were adhered 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 one-way ANOVA, Tukey and t test. The results of this study were as follows; 1. The μSBS of Group 2 (16.50 ± 2.31 MPa) and Group 4 (15.83 ± 2.33 MPa) to the end of enamel prism was significantly higher than that of Group 1 (11.93 ± 2.25 MPa) and Group 3 (11.97 ± 2.05 MPa) (p ＜ 0.05). 2. The μSBS of Group 2 (13.43 ± 2.93 MPa) to the side of enamel prism was significantly higher than that of Group 1 (8.64 ± 1.53 MPa), Group 3 (9.69 ± 1.80 MPa), and Group 4 (10.56 ± 1.75 MPa) (p ＜ 0.05). 3. The mean μSBS to the end of enamel rod was significantly higher than that to the side of enamel rod in all group (p ＜ 0.05).