三种根管封闭材料根尖封闭能力的远期评价

摘要

Objective To evaluate the sealing ability of there kinds of material.Methods 122 single rooted human anterior teeth were prepared and randomly divided into there experimental groups(n=20).Group A was filled with lat-eral compaction gutta-purcha+ zinc oxide-eugenol paste.Group B was filled with lateral compaction gutta-purcha+AH-Plus.Group C was filled with GuttaFlow obturation system+cone.20 teeth of each group were immersed in India ink,then demineral-ized,dehydrated and cleared after filled,The other 20 teeth of each group were stored for six months in a constant temperature box then repeat the above operation .Linear dye penetration was determined with vernier cali-per under magnifier of 8X.Results The apical leakage of group A0 ,B0 ,C0 was(0.89±0.41)mm,(0.69±0.30)mm, (0.67±0.25)mm,The apical leakage of group A6 ,B6 ,C6 was (2.97 ±0.92)mm,(0.67 ±0.28)mm,(0.57 ±0.24) mm.Statistical analysis of different group of A0 ,B0 ,C0 is no difference between group A0 ,B0 ,C0 of dye penetration length(F=2.76,P >0.05),Statistical analysis of different group of A6 ,B6 ,C6 is significant difference between three groups(P < 0.05).there was significant difference in dye penetration length A0 group and A6 group,there was no difference in dye penetration length either B0 group and B6 group(t=0.26,P >0.05)or C0 group and C6 group(t=1.2, P >0.05).Conclusion The sealing ability of GuttaFlow obturation system and AH-Plus is not significant,but are bet-ter than Zinc Oxide paste.%目的：评价三种根管封闭材料的根管封闭性能。方法选取航天中心医院口腔科门诊拔除的122颗离体前牙用 Protaper 镍钛锉预备后随机分为3个组，每组40颗，分别用氧化锌糊剂（A 组）、AH-Plus 根管充填剂（B 组）、GuttaFlow 常温流动牙胶（C 组）三种根管封闭材料加牙胶尖进行根管充填，余下两颗作为对照。每组20颗在充填即刻根充后用炭黑墨水染色、脱矿、脱水、制成透明牙，另20颗充填后在恒温箱中保存六个月后制作。在8x 放大镜下用游标卡尺测量染液渗入根管的长度。结果 A、B、C 组根充后即刻（记为 A0、B0、C0）染料渗入长度分别为（0．89±0.41）mm、（0．69±0．30）mm、（0．67±0．25）mm，A、B、C 组根充6个月后（记为 A6、B6、C6）染料渗入长度分别为（2．97±0．92）mm、（0．67±0．28）mm、（0．57±0．24）mm。同期不同组间统计分析表明：A0、B0、C0三组染料渗入长度无差异（F＝2.76，P ＞0．05），A6、B6、C6三组有显著性差异（P ＜0．05）。同组六个月前后比较统计分析表明：A0组和 A6组染料渗入长度有显著性差异（t＝9．2，P ＜0．05），B0组和 B6组染料渗入长度无显著性差异（t＝0．26，P ＞0．05），C0组和 C6组渗入长度无显著性差异（t＝1．2，P ＞0．05）。结论 GuttaFlow 常温流动牙胶和 AH-Plus 根管充填剂封闭性能差别不显著，但均优于氧化锌糊剂。