3种粘接剂在离体后牙纵折粘接修复中的微拉伸强度的比较

Comparison of three adhesives' microtensile bond strength in the recovery of vertical tooth fracture in vitro

目的:比较3种粘接剂3M Adper Easy One(3AEO)、Clearfil S3Bond(CSB)及Super-Bond C&B(SBCB)在后牙纵折模式中的粘接强度。方法:选用30颗新鲜拔除的人磨牙,随机分成3组(n=10)。用低速切割沿着牙长轴将离体牙切开,制备成统一的纵折模型。分别用3种粘接剂将3组牙齿的折裂面粘接起来。冷热循环500次后37℃蒸馏水中放置24 h。用低速切割机垂直于粘接面制备成1.0 mm×1.0 mm横截面积的柱状试件,测试其微拉伸强度,并观察断裂模式,进行统计学分析。结果:SBCB、3AEO及CSB的粘接强度(MPa)分别为22.75±5.18、18.57±4.98和16.93±4.70(P<0.05)。试件断裂模式以界面断裂为主,组间比较无差别(P>0.05)。结论:SBCB在纵折牙牙面的粘接上粘接强度高于3AEO和CSB。

Objective： To compare the bonding strength of 3M Adper Easy One （3AEO）, Clearfil S3 Bond （CSB） and Super-Bond C＆B （SBCB） in vertical tooth fracture mode. Methods： 30 freshly extracted human molars were randomly assigned to three groups （n = 10 ）. The teeth were cut along the long axis with low speed cutting machine and were prepared into a unified model of the vertical tooth fracture. The three adhesives were respectively used to adjoin the surface of the fractured teeth. The samples were subjected to thermal cycling for 500 cycles, stored in distilled water at 37℃ for 24 h. Then the pillar-like specimens with the bonding area of 1.0 mm × 1.0 mm were prepared. The microtensile bond strength was measured and the fracture mode was observed. Results ： The bond strength （MPa） of 3AEO, CSB and SBCB was 18.57 ±4.98, 16.93 ± 4.70 and 22.75 ± 5.18 respectively（ P 〈 0.05 ）. The fracture mode was mainly interficial failure in all groups（ P 〉 0.05 ）. Conclusion： The surface bonding of Super-Bond C＆B in tooth fracture is stronger than 3 M Adper Easy One and Clearfil S3 Bond.