比较2种根管充填糊剂对根尖封闭性的作用

目的用染料渗透法测量根管微渗漏的程度，比较2种根管充填糊剂在根管充填后不同时间进行桩腔预备后对根尖部的封闭能力。方法选取90颗成人的上颌中切牙，逐步后退法预备根管，侧向加压技术充填根管，充填剂分别用Cortisomol糊剂（A组）和氧化锌丁香油糊剂（B组），每组45颗上颌中切牙。根据根管充填后桩腔预备时间将A组上颌中切牙随机分为A1组、A2组和A3组，每组15颗，A1组为根管充填后即刻进行桩腔预备，A2组为根管充填后2周进行桩腔预备，A3组为根管充填后4周进行桩腔预备。根据根管充填后桩腔预备时问将B组上颌中切牙随机分为B1组、B2组和B3组，每组15颗，B1组为即刻进行桩腔预备，B2组为根管充填后2周进行桩腔预备，B3组为根管充填后4周进行桩腔预备。进行桩腔预备后用染料渗透法评价各组根尖渗透能力。结果Cortisomot组（A组）与氧化锌丁香油组（B组）在根管充填后相同时间进行桩腔预备后，根尖微渗漏的差异具有统计学意义（P〈0．01）。A组在根管充填后即刻、2周、4周时进行桩腔预备，其根尖微渗漏的差异具有统计学意义（P〈0．01）。B组在根管充填后即刻、2周、4周时进行桩腔预备，其根尖微渗漏的差异无统计学意义（P〉0．05）。结论Cortisomol根管充填糊剂的封闭作用效果比氧化锌丁香油糊剂好。

Comparison on the effects of apical sealing by two kinds of root canal filling materials

Objective To compare the apical sealing effects of two kinds of root canal filling materials at different space-preparation time with dye penetration method. Methods 90 adults upper incisals were randomly divided into two groups which were 45 teeth, and prepared with back step method and obturated with lateral condensation method with Cortisomo(lA) and zinc-oxide-eugenol cemen(tB) as the root canal sealant. Then according to the post-space-preparation time, group A was randomly divided into 3 groups, which ...