不同根管充填方法的封闭能力比较

目的：比较冷侧压和垂直加热加压根管充填方法及根管封闭剂的封闭能力。方法：60颗单根管离体前牙、前磨牙,用TF锉冠向下法根管预备至#.06/25。随机分为4组,每组15颗牙。A组：牙胶尖＋AH Plus冷侧压充填,B组：牙胶尖＋冷侧压充填,C组：牙胶尖＋AH Plus＋BeeFill热牙胶注射充填,D组：牙胶尖＋BeeFill热牙胶注射充填。用2%亚甲基蓝染料7d后颊舌向纵切后,用根管显微镜放大20倍并测量染料渗透,采用Kruskal-Wal-lis检验和Mann-Whitney U检验。结果：各实验组间染料渗漏有显著性差异（P〈0.05）,A组和C组之间染料渗漏无显著性差异。无根管封闭剂组染料渗漏明显多于有根管封闭剂组。结论：热垂直加压充填和冷侧压充填技术在根尖渗漏方面无统计学差异,根管封闭剂的使用对减少根管的微渗漏、提高根管封闭性能具有重要意义。

Comparison of Apical Sealing Ability of Cold Lateral Compaction and Warm Vertiacal Compaction Techniques in Vitro

Objective： To compare the apical sealing ability of roots filled with cold lateral compaction and warm vertical compaction with and without root canal sealer using a dye leakage method.Methods： Sixty extracted single rooted teeth were prepared with Twisted Files NiTi rotary instruments to size 0.06/25.The teeth were then randomly divided into 4 experimental groups（n=15）： group A： Gutta-percha ＋ AH-Plus sealer（Cold lateral compaction）,group B： Gutta-percha（Cold lateral compaction）,group C： Gutta-percha ＋ AH-Plus sealer（Warm vertical compaction）,group D： Gutta-percha（Warm vertical compaction）.The samples were immersed in 2% methylene blue dye solution for 7 days and split longitudinally and the length of dye penetration was measured on digital images obtained under microscope at ×20 magnification.The significant difference was analyzed by Kruskal-Wallis test and Mann-Whitney U test.Results： There was a significant difference in the dye leakage among four groups（P0.05） and no significant difference in the dye leakage between group A and group C.Dye leakage was significantly more in groups without root canal sealer.Conclusion： There is no significant difference in the leakage between warm vertical compaction and cold lateral compaction technique when used with root canal sealer and gutta-percha cones matching the size and taper of canal preparation and also that root canal sealer is essential for decreasing the leakage.