자가부식 프라이머 접착제의 적용방식이 법랑질의 결합강도에 미치는 영향

Abstract

The purpose of this study was to evaluate the bonding effect to passive or active application of Primer and coat times of Bond when a self-etching primer adhesive (Clearfil SE Bond) was applied to enamel surface. Crowns of sixteen human molars were bisected mesiodistally by high speed diamond point. Using Isomet Low Speed Saw, buccal and lingual enamels of crowns were partially exposed and slabs of 1.2 mm thick were made. Enamel surfaces were polished with P-120 grade silicone carbide papers. They were divided into one of four equal groups (n=8) according to passive or active application of Primer and coat times of Bond to enamel surface; Group 1: passive application of Primer and 1 coat of Bond, Group 2: active application of Primer and 1 coat of Bond, Group 3: : passive application of Primer and 2 coats of Bond, Group 4: active application of Primer and 2 coats of Bond. Clearfil AP-X was bonded to enamel suface of each group using Tygon tubes. After storage in distilled water for 24 hours, the bonded specimens were subjected to microshear bond strength (uSBS) testing with a crosshead speed of 1mm/min. The mean uSBS (n=20 for each group) was statistically compared using two-way ANOVA and independent t-test. The results of this study were as follows; 1. The uSBS of Group 1 was the lowest among groups and the uSBS of Group 4 was the highest. 2. There was not statistically significant interaction between enamel uSBS by application method of Primer and coat time of Bond (p > 0.05). 3. There was not statistically significant difference between enamel uSBS by passive and active application of Primer (p > 0.05). 4. There was statistically significant difference between enamel uSBS by one- and two-coat of Bond ( p < 0.05). Within the limitation of this study, enamel uSBS of Clearfil SE Bond was increased by increased coat times of Bond rather than passive or active application of Primer.