牙本质表面不同处理方法对粘接剂与牙本质间剪切强度的影响

目的研究氧化锌丁香酚黏固剂和Gluma脱敏剂对牙本质与磷酸锌黏固剂、玻璃离子黏固剂和Super- BondC&B树脂粘接剂间剪切强度的影响，为临床上牙体制备后应用不同的保护方法及选用不同类型的粘接剂提供理论依据。方法90颗前磨牙在流水冲洗下去除颊面釉质暴露浅层牙本质。依次用粒度为320、400、600目的水砂纸磨平牙本质粘接面。牙根用自凝树脂包埋，牙冠暴露。包埋好的90颗牙齿随机分为3个大组，分别为：A组为对照组，牙本质表面不作任何处理；B组牙本质表面用氧化锌丁香酚黏固剂均匀涂抹一薄层；C组用Gluma脱敏剂均匀涂抹一薄层。测试两种处理剂处理牙本质表面后，3种粘接剂与牙本质间剪切强度的大小，进行统计分析及扫描电镜观察。结果应用两种处理剂后磷酸锌黏固剂与牙本质间剪切强度明显下降（P<0.05），C1组下降更明显；玻璃离子黏固剂和Super- Bond C&B树脂粘接剂与牙本质间剪切强度没有明显变化。结论两种处理剂均对磷酸锌黏固剂与牙本质间粘接强度有不利影响；对玻璃离子黏固剂和Super- Bond C&B树脂粘接剂与牙本质间粘接强度无不利影响。

Effect of different treatments of dentin surface on sheer bond strength between different bonding agents and dentin

OBJECTIVE: To evaluate the effect of Zinc oxide-eugenol cement and Gluma desensitizer on the sheer bond strength of three kinds of dentin bonding agents. The three dentin bonding agents were Zinc phosphate cement, Glass ionomer cement and Super-Bond C&B. To find the theory depending for the using of different protective methods and the selecting of different kinds of dentin bonding agents in prepared abutment teeth. METHODS: The buccal surfaces of ninety freshly extracted human premolars were flattened to expose an adequate area of lower dentin. Followed by wet-grinding on a series of silicon carbide paper from number 320, 400, 600 grit to produce the dentin bonding surface. The teeth roots were embedded in self-curing resin with the crown out of the resin. The embedded ninety teeth were divided randomly into three groups. The group A was control and the dentin surfaces were not treated. The group B was covered with a paste of Zinc oxide-eugenol cement. The group C was covered with Gluma desensitizer. Calculating the sheer strength between three bonding agents and dentin after the two treatments of dentin surface. The results were statistically assessed with SPSS software. Dentin surfaces were observed with scanning electron microscope (SEM). RESULTS: The sheer bond strengths of Zinc phosphate cement had significant decrease (P<0.05), especially the C1 group. The sheer bond strengths of Glass ionomer cement and Super-Bond C&B had no significant difference. CONCLUSION: Zinc oxide-eugenol cement and Gluma desensitizer could reduce the sheer bond strength of Zinc phosphate cement with dentin surface. Zinc oxide-eugenol cement and the Gluma desensitizer could not effect Glass ionomer cement and the Super-Bond C&B with dentin.