상아질 표면의 거칠기가 자가부식 접착제의 결합강도에 미치는 효과

Abstract

The purpose of this study was to compare the microshear bond strength of a self-etching primer adhesive to dentin prepared with different diamond points, carbide burs and SiC papers, and also to determine which SiC paper yield similar strength to that of dentinal surface prepared with points or burs. Fifty-six human molar were sectioned to expose the occlusal dentinal surfaces of crowns with Isomet Low Speed Saw and slabs of 1.2 mm thick were made. Dentinal surfaces were removed with three diamond points, two carbide burs, and three SiC papers. They were divided into one of eight equal groups (n=7); Group 1: standard diamond point(TF-12), Group 2: fine diamond point (TF-12F), Group 3: extrafine diamond point (TF-12EF), Group 4: plain-cut carbide bur (no. 245), Group 5: cross-cut carbide bur (no. 557), Group 6 : P 120-grade SiC paper, Group 7: P 220-grade SiC paper, Group 8: P 800-grade SiC paper. Clearfil SE Bond was applied on dentinal surface as a instruction of manufacturer and Clearfil AP-X was placed on dentinal suface using Tygon tubes. After storage in distilled water for 24 hours, the bonded specimens were subjected to μSBS testing with a crosshead speed of 1mm/min. The mean μSBS (n=20 for each group) was statistically compared using one-way ANOVA and Tukey HSD test. The results of this study were as follows; 1.The ranking of μSBS to the dentinal surfaces prepared with different burs was Group 3, 4, 5, 2, and 1 from the highest and the lowest. 2.The μSBS of Group 1 was the lowest among groups and it was significantly lower than that of Group 3, 4, 5, 7 and 8 ( p < 0.05). 3.The μSBS of Group 8 was the highest among groups and it was not significantly different to that of Group 3 ( p > 0.05). 4.The μSBS to the dentinal surfaces prepared with P 220-grade SiC paper was similar to that of prepared with fine diamond point or carbide burs. In conclusion, the use of extrafine diamond point is recommended for improved bonding of Clearfil SE Bond to dentin. Also the use of P 220-grade SiC paper in vitro will be yield the results closer to dentinal surface prepared with fine diamond point or carbide burs in vivo.