碘仿自固化磷酸钙根管糊剂封闭性的体外研究

目的:观察注射型碘仿自固化磷酸钙(CPC)根管糊剂在体外充填根管的封闭性能。方法:62颗离体单根管牙用K锉常规法预备至40#,其中58颗随机分为2个实验组,分别用注射型碘仿CPC糊剂和氧化锌丁香油碘仿糊剂作为根管封闭剂,牙胶尖侧压法充填根管。另外4颗作为对照组。根充材料凝固后,将牙的根尖部分浸泡于2%亚甲蓝染料中6d,沿牙体长轴纵向劈开,测量根管内壁染料渗漏长度。采用团体t检验进行统计学分析。结果:注射型碘仿CPC充填组平均渗漏8.400mm,氧化锌丁香油碘仿糊剂组平均渗漏5.300mm,2组的渗漏值有显著性差异(P<0.05)。结论:碘仿CPC的体外根管封闭性不及氧化锌丁香油碘仿糊剂。

In vitro evaluation of the sealing ability of an iodoform-calcium phosphorate cement root canal filler

PURPOSE: To evaluate the sealing ability of an injectable iodoform-calcium phosphate cement(CPC) root canal filler in vitro. METHODS: Sixty-two single-rooted human extracted teeth were selected and root canals were instrumented to 40# with K file .Fifty-eight teeth were randomly divided into two experimental groups. The root canals were filled by lateral condensation of gutta-purcha with iodoform-CPC or zinc-oxide-eugenol-iodoform paste used as sealer respectively. Other four teeth were used as control. When the sealer was solidified, the apical portion of tooth was soaked into 2% methylene blue for 6 days. After the tooth was longitudinally sectioned, the dye length was measured for apical microleakage.The data obtained were analysed with group t test. RESULTS: The average microleakage in iodoform-CPC group(8.400mm) was significantly larger than that in the control group(5.300mm), P=0.021. CONCLUSIONS: We conclude that iodoform-CPC does not provide a sealing ability as good as zinc-oxide-eugenol-iodoform paste in vitro.