“劲润”牙本质保护膜的牙本质粘结性能探讨

目的：探讨“劲润”牙本质保护膜（Hybrid Coat，HyC）的牙本质粘结性能。方法：选取A组（HyC）和其他3组不同类型的牙本质粘结剂：B组（G-Bond）、C组（MegaBond）和D组（single Bond），比较其对牛牙牙本质的剪切粘结强度，并用实体显微镜观察粘结界面断裂模式。各组试料数分别为n=10，结果通过Tukey-Kramer（P〈0．05）进行统计学分析。结果：B、C、D组均显示了较大的粘结强度，3组之间无统计学差异。A组（HyC）显示了较低的粘结强度，约10．08MPa，与其他3组之间存在显著性差异。断裂模式显示，A组（HyC）以界面破坏为主，而其他3组以凝集破坏和混合破坏为主。结论：本研究结果提示，“劲润”牙本质保护膜（HyC）的粘结强度弱于其他3组牙本质粘结剂。为了保证HyC长期稳定的防过敏效果及粘结性能，在今后的研究中有必要进一步探讨如何提高HyC的牙本质粘结性能。

Research of dentin bond strength of resin coating material-Hybrid Coat

Objective To evaluate the bond strength of resin coating material of Hybrid Coat （HyC） to dentin. Methods A group （HyC） and other three kinds of dentin adhesives,B group （G-Bond）,C group （Mega Bond） and D group （Single Bond） were selected and applied to bovine teeth according to manufacturers＇ instructions.The shear bond strength of each specimen was measured and analyzed with Tukey-Kramer Test （p〈0.05）.Stereomicroscope was used to observe the fracture modes. Results B,C and D groups showed higher bond strength,but there was not any significant difference among them.A group （HyC） showed the lowest strength of about 10.08 MPa,and there was significant difference between A and the other three groups. Stereomicroscope examination indicated that the adhesive failure wasthe most mode of fracture in A group and cohesive failure and mixed failure were the main mode of fracture in B,C and D groups. Conclusion The three kinds of dentin bond agents showed higher shear bond strength than HyC.It is necessary to enhance the bond strength of HyC to dentin in the following research to ensure the long-term effectiveness of dentin coating technique.