3종 상아질 접착제의 전단결합강도에 관한 연구

Abstract

The purpose of this study was to evaluate and compare the shear bond strength to dentin of three dentin adhesive systems. Thirty freshly extracted human teeth were mounted in acrylic molds and the facial surfaces were prepared to expose middle dentin, which polished to 800-grit. Teeth were randomly classified to three groups(n=10) according to the dentin bonding agent used. The materials used in this study was Scotch Bond Multi-Purpose(3M ESPE Co.); Group Ⅰ, Single Bond(3M ESPE Co.); Group Ⅱ and Adper Prompt L-Pop(3M ESPE Co.); Group Ⅲ). The dentin adhesive systems were applied according to the manufacturer's recommendations. All specimens were restored with the composite resin Z250(3M ESPE Co.) and stored in distilled water at 37℃ for 24 hours and thermocycled for 600 cycles between 5℃ and 55℃ with 30-s dwell times at the minimum and maximum temperatures. The shear bond strength were tested using universal testing machine(AGS 1000D, Shimadzu, Tokyo, Japan) at a cross head speed of 1 mm/min. The data was statistically analyzed by one-way ANOVA. The results obtained were as follows; 1. The mean and standard deviation of shear bond strengths for Group Ⅰ, Ⅱ, and Ⅲ were 30.3±5.8 MPa, 20.2±9.8 MPa, and 29.5±3.2 MPa. 2. The Group Ⅰ and Ⅲ showed significantly higher shear bond strength compared to Group Ⅱ (p＜0.05). No differences were found between the Group Ⅰ and Ⅲ. 3. Group Ⅲ showed the lowest standard deviation. In conclusion, in spite of a simplification of bonding procedures in the self-etching dentin bonding system, the Adper Prompt L -Pop(Group Ⅲ) showed higher shear bond strength to dentin like the three-step conventional bonding system, Scotch Bond Multi Purpose(Group Ⅰ). It could be used effectively in restorative dentistry.