摘要
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 Resi Lute,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 determine 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.
出处
《牙体牙髓牙周病学杂志》
CAS
2015年第10期610-614,共5页
Chinese Journal of Conservative Dentistry
基金
中华口腔医学会口腔健康促进与口腔医学发展西部行临床科研基金项目(CSA-W2012-01)
