摘要
目的
比较三种不同树脂粘固剂对桩腔预备后的根管牙本质粘结强度的差异,探讨依地酸(EDTA)冲洗桩腔对粘结强度的影响。
方法
选用60个根尖发育完全的上颌前牙,用根管糊剂(AH-Plus)和牙胶尖进行根充,置37℃的恒温水浴中2周,在釉牙骨质界冠方约2mm处截冠,桩腔预备后包埋,随机分成3组,每组20个,分别用三种不同的树脂粘固剂(Ⅰ.自粘结通用树脂粘固剂(self-adhesive universal resin cement)RelyX Unicem,Ⅱ.固化复合树脂粘固剂(dual-cured composite resin cement)Panavia F,Ⅲ.牙本质树脂粘固剂(dental adhesive resin cement)super Bond B&C)粘固整个桩腔。每组分a,b两个亚组,各10个,a组在粘固前用14%EDTA冲洗1min,b组用去离子水冲洗1min。粘固后的牙根用慢速连续切成厚约1mm的试件并将其按照根的冠,中,尖1/3分三组,测试其粘结强度。然后对其各部分的粘结强度用统计学方法分别进行比较。
结果
经相同冲洗液处理,分别比较三种粘固剂在各部位的粘结强度,其差异均无统计学意义;第Ⅰ组和第Ⅱ组经14%EDTA处理后,在冠、中、尖三个部位的粘结强度比较均高于去离子水处理组(P＜0.05),第Ⅲ组内(即Ⅲa与Ⅲb),各部位粘结强度无显著性差异;用相同粘固剂和同种冲洗液处理方式后,第Ⅰ组和第Ⅲ组冠1/3的粘结强度均高于尖1/3(P＜0.05),而第Ⅱ组冠1/3与尖1/3的粘结强度比较无统计学差异。
结论
三种不同粘固剂的粘结强度无显著性差异;14%EDTA冲洗桩腔可增加自酸蚀粘固剂Panavia F和自粘结粘固剂RelyX Unicem的粘结强度。
Objective
To evaluate the bond strength of three different luting cements and 14%EDTA irrigants on dentin bond strength after post space preparation.
Methods
Sixty extracted sound maxillary central incisors were endodontically treated and cut transversely 2 mm coronal to the cemento-enamel junction.After post space preparation, the teeth were assigned to three groups with 20 teeth each.The teeth of three groups were cemented with 3M ESPE RelyⅩUnicem(GroupⅠ),Panavia F(GroupⅡ) and Super Bond B&C(GroupⅢ) respectively.The teeth of each group were then divided into two subgroups,one was treated with 14%EDTA for 1 min and the other with deionized water.After filled with respective luting cements,each root was serially sectioned into 6 slices of 1mm thick for or push-out tests.The bond strength of coronal, middle and apical thirds was measured separately.SPSS 16.0 Kruskal-Wallis H test and Mann-Whitney U test were used for statistical analyses.
Result
In each third of root canal,no significant difference of bond strength was found among the three different luting cement systems with the same irrigants.In the groupⅠandⅡ,the subgroup of 14%EDTA had significantly higher bond strength when compared to the subgroup of deionized water at each third(P＜0.05).The push-out bond strength in coronal third of root canal was significantly higher than that in apical third in groupⅠandⅢ.No significant difference of bond strength was found among the three thirds in groupⅡ.
Conclusion
There was no significant difference of bond strength of three different luting cement systems for clinical application.Irrigation with 14%EDTA after post space preparation can significantly improve the bond strength of the self-etching and the self-adhesion luting systems.The root regions have influence on the bond strength of luting cements.
引文
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