目的：：评价聚乳酸( PLA)可吸收薄膜对可吸收螺纹桩与根管壁间的封闭性能。方法：选择36个完整离体上颌中切牙,常规根管治疗术后,随机取3个样本作为阴性对照( E组),其余33个样本随机分为A、B、C 3个实验组(n=10)和1个阳性对照组(D组,n=3),行桩道预备后,A组：采用可吸收薄膜固位封闭PLA可吸收螺纹桩；B组：采用双固化树脂粘结玻璃纤维桩；C组：采用玻璃离子粘结金属螺纹桩；D组：不行桩修复。各组处理后,样本牙浸泡于印度墨水72 h后纵向剖开,体视显微镜下观察和测量各剖面微渗漏情况,并进行统计分析。结果：D组微渗漏累及整个桩道； E组无微渗漏。 A、B、C组微渗漏( mm)分别为1.30±0.77、0.50±0.45、1.47±0.41,B 组与 A、C 组相比有统计学意义(P =0.002),A、C 组相比差异无统计学意义(P=0.246)。结论：PLA薄膜具有可吸收性且根管壁间的封闭性能与玻璃离子粘结剂相当。%AIM:To investigate the sealing capability of endodontically treated teeth restored with polylatic acid( PLA) absorbable post and membrane. METHODS:36 extracted maxillary central incisors were used. 3 incisors were untreated as the negative controls( group E) , 33 teeth were chemomechanically prepared and filled with gutta-percha and sealer. The teeth in group A ( n=10 ) were restored with PLA absorbable post and membrane, those in group B(n=10) with fiber post cemented by ResiLute, a kind of dual cure resin cement, in group C(n=10) with metal screw post cemented by glass ionomer cement (GIC). Then the teeth in group A, B and C were restred with post, 3 teeth without post in group D were used as the positive controls. All teeth were separately immersed in Indian ink for 72 h. Buccolingual sections were made through the vertical axis of the specimens and a stereomicroscope was used to evaluate the deepest length of dye penetration. The Kruskal-Wallis H nonparametric test was used to deter-mine intergroup difference. RESULTS:No micrdeakage was observed in group E and microleakage covered the whole post space in group D. A statistically significant difference of microleakage was observed among the three tested groups (P=0. 002). Group B had the lowest microleakage (0. 50+0. 45) mm, followed by Group A (1. 30+0. 77) mm and Group C (1. 47+0. 41) mm. But no significant difference was observed between Group A and Group C (P=0. 246). CONCLUSION:The sealing capability of PLA is comparable with that of glass ionomer cement.
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