树脂黏结剂对纤维桩剪切黏结强度的研究

Research of shear bonding strength of fiber posts bonding with resin cements

目的比较两种树脂黏结系统对纤维桩的黏结强度,分析纤维桩在牙根不同部位的黏结力大小。方法选用10颗离体上頜中切牙并与釉牙骨质界冠方上1 mm处截冠,常规根管治疗后随机分两组,根管预备后分别用One-step和Panavia F两种黏结系统将石英纤维桩黏固于根管内,通过推出实验分别测试两种树脂黏结系统在牙根不同部位的黏结强度,并进行统计学分析和比较。结果One-step和Panavia F黏结系统的黏结强度分别为(10.466±0.939)MPa和(9.480±0.876)MPa,两者比较差异显著(P<0.05);One-step和Panavia F黏结系统根颈部和根尖部的总体黏结强度分别为(10.747±0.662)MPa和(9.200±0.632)Mpa,两者比较差异显著(P<0.05)。结论全酸蚀黏结系统对纤维桩的黏结强度大于自酸蚀黏结系统;树脂黏结剂在根颈部对纤维桩的黏结强度大于根尖部。

Objective To compare the bonding strength of fiber posts cemented to root canals with two different resin cements and to analyse the strength in different position of the root canal. Methods Ten teeth were collected and the crown portion of each tooth was removed by cutting with a diamond blade under copious water cooling 1 mm upwards the cementum enamel junction. After the root canal therapy, they were randomly divided into 2 groups （ n = 5）. One group were bonded to root canals with One-step and the other with Panavia F after the root canal preparation. Then the push out test was conducted to assess the push out shear bond strength of the specimen. The data were compared and analysed. Results The mean push out shear bonding strength of the groups cementd with One-step and Panavia was （ 10. 466 ± 0. 939） MPa and （9. 480 ±0.876） Mpa, respectively. There were significant differences between them （P 〈 0.05）. And the mean push out shear bonding strength of the coronal level group and the apex level group was （10. 747 ± 0. 662 ）MPa and （9. 200 ± 0. 632 ） Mpa, respectively. There also exited significant differences between them （P 〈 0.05）. Conclusion The total-etching adhesive system may gain higher bonding strength than self-etching adhesive system, and the resin cements may gain higher bonding strength in the coronal portion of the teeth than in the apex portion.