目的 比较4种粘接方法在不同根管深度内对纤维桩粘接强度的影响.方法 选取28颗离体上颌单根管前牙,常规根管治疗和桩道预备后根据粘接方法随机分为四组.Ⅰ:全酸蚀组(LuxaBond+LuxaCore);Ⅱ:自酸蚀组(iBond+ LuxaCore);Ⅲ:自粘接组(RelyXUnicem);Ⅳ:酸蚀加自粘接组(32%磷酸+RelyXUnicem)对纤维桩进行粘接,之后将粘接有纤维桩的牙切割成1mm厚度的薄片,记录根段部位,将薄片分为根管冠部、中部和尖部三个亚组,进行推出测试后记录薄片推出力值和薄片破坏方式.结果 Ⅰ组和Ⅳ组分别和Ⅱ组、Ⅲ组粘接强度有显著差异(P<0.05),Ⅰ组和Ⅳ组间粘接强度差别无统计学意义(P>0.05);根管冠部粘接强度显著高于尖部(P<0.05).结论 全酸蚀粘接系统粘接强度高于自粘接和自酸蚀系统;自粘接系统加用酸蚀技术可以显著提高纤维桩在根管内的粘接强度;纤维桩在根管内的粘接强度根管冠部大于尖部.%Objective To evaluate the effects of four different bonding procedures on the push-out test of fiber-reinforced composite posts. Methods Twenty-eight extracted teeth were endodontically treated, dowel space prepared, and divided into four groups. Each group was treated with different bonding procedures: Group Ⅰ with three-step total etch system (LuxaBond/LuxaCore), Group Ⅱ with self-etch system (iBond/LuxaCore), GroupⅢself-adhesive system (RelyX Unicem), GroupⅣ etching + self-adhesive system (32％phosphoric etching/RelyX Unicem). After dowel cementation, six thin-sliced specimens were made and a push-out test was performed.Results The test showed that bonding procedures had significant impacts on the bond strength (P < 0.05). Group I had the hightest bond strength compared with Group Ⅱ and Group Ⅲ. For the variable “root region", the coronal resulted in statistically significant difference with middle and apical region (P＜O. O5). Conclusions Three-step adhesive total etch system was the best way to cement fiber posts compared with serf-etch and serf-adhesive system. Etehant material influenced the bond strength of a prefabricated dowel in the canal. Coronal root region comparatively had the highest bond strength.
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