插销式桩冠在低龈距后牙残根冠修复中的应用

Application of bolt-like post crown system in restoration of molar residual root and crown with low occlusogingival distance

目的:探讨插销式桩冠在低龈距后牙残根冠修复中的应用和操作程序。方法:对25例32个低龈距后牙残根冠进行桩冠修复,取其较直根管作为主桩制作桩冠,分叉较大的根管制作插销,插入冠部预留的孔道辅助固位。结果:随访1～5a,失访3例,其余29例修复体均未出现松动和根折等现象,边缘密合、咬合关系和邻接关系良好。结论:用插销式桩冠修复低龈距后牙残根冠,固位强、抗力好,可最大限度恢复患牙的功能和美观。

PURPOSE：To evaluate the clinical effects of bolt-like post crown system in restoration of molar residual root and crown with low occlusogingival distance and large root bifurcation angle.METHODS：Thirty two molar residual roots and crowns from 25 patients with low occlusogingival distance （〈4 mm） and large root bifurcation angle were involved in this study.First, the root canals were prepared according to their natural directions following the standard procedures.Accurate impressions were taken with silicone.The core crown and the post which would inserted the straight root canal were founded together,and the blot-like post which would inserted the root canal with bigger bifurcat were founded alone.Finally, the two parts were cemented together in patient after try-in with RelyXTM Unicem cement.RESULTS：Except 3 patients who were lost during the follow up period, the remaining 22 patients （29 restorations） were followed up for 1 to 5 years.No prosthetic loosening or root fracture was observed during the follow-up period.All the fixed restorations were found with good marginal fitness, well masticatory function and favorable proximal contact relationship.CONCLUSIONS：Bolt-like post crown system is an ideal method for restoration of molar residual root and crown with low occlusogingival distance and large root bifurcation angle.This approach has positive effect on the retention, function and aesthetic outcome of the fixed restorations of molar residual root and crown with low occlusogingival distance.