원문정보
Effect of modeling liquid on the shear-bond strength of zirconia core - porcelain veneer
초록
영어
Purpose: This study is to evaluate the effect of modeling liquid on the shear-bond strength between zirconia core and veneering ceramic. Methods: Disk-shaped (diameter: 12.0㎜ ; height: 3.0㎜) zirconia were randomly divided into six groups according to the surface conditioning method and whether modeling liquid is used or not to be applied (N=60, n=10 per group): group 1 - control group with distilled water(ZD); group 2 - control group with modeling liquid(ZM); group 3 - airborne particle abrasion with 110-um Al2O3(AD)with distilled water; group 4 - airborne particle abrasion with 110- Al2O3 with modeling liquid(AM); group 5 - liner with distilled water(LD); group 6£≠liner with modeling liquid(LM). Contact angles were determined by the sessile drop method at room temperature using a contact angle measurement apparatus. The specimens were prepared using dentin veneering ceramics, veneered, 3 high and 2.8 in diameter, over the cores. The shear bond strength test was performed in a Shear bond test machine. Load was applied at a cross-head speed of 0.50㎜ /min until failure. The fractured zirconia surfaces were evaluated by using stereomicroscope ( x 30). Collected data were analyzed using SPSS(Statistical Package for Social Sciences) Win 12.0 statistics program. Results: ZD showed the highest contact angle(50.6 ± 5.4 ) and LD showed the lowest value(6.7 ± 1.3 ). Control groups and zirconia liner groups were significantly higher contact angle than liner groups(p<0.05). LD was the highest shear bond strength(43.9 ± 3.8 ) and ZD was the lowest shear bond strength(24.8 ± 4.9 ). Shear bond strengths of control groups and contact angle of liner groups were not significantly different((p>0.05). Liner groups presented adhesive failures. The others groups showed cohesive and adhesive failures. Conclusion: Modeling liquid groups showed lower contact angles and lower shear bond strength compared to those of distilled water groups.
목차
Ⅰ. 서론
Ⅱ. 연구 방법
1. 시편 제작
2. 접촉각 측정
3. 전단결합강도 측정
4. 파절양상 관철
5. 통계 분석
Ⅲ. 결과
Ⅳ. 고찰
Ⅴ. 결론
REFERENCES