Abstract: Abstract：Objective To analyze the relationship of two kinds of root canal filling method with the stress of root canal wall. Methods Cold gutta-percha lateral pressure method and warm gutta-percha vertical condensation method were used to fill the single root premolars. Use medical 3D image editing software to extract the gutta-percha morphology. Through a specific finite element analysis software， calculate the root canal wall stress and the stress position. And at 3，6 and 9 mm from the anatomical apix image analysis software was used to observe gutta-percha morphology and dentine cracks. Results Dentine cracks by cold gutta-percha lateral compression method were significantly more than those by warm gutta-percha vertical condensation method，and the stress of root canal wall was also higher than that of warm gutta-percha vertical condensation technique. Conclusion The root canal wall stress by cold gutta-percha lateral compression method is higher than that by warm gutta-percha vertical condensation method，and is likely to cause dentine cracks.

Key words: warm gutta-percha, three-dimensional finite element, stress analysis, root canal filling, dentine crack

摘要： 目的 分析冷牙胶侧向加压与热牙胶垂直加压法充填后根管壁应力及其与牙本质裂纹发生的关系 。方法 选取2011年4—6月于哈尔滨医科大学附属口腔医院口腔外科门诊因正畸需要或牙周病原因新鲜 拔除的人完整单根管离体牙40颗，采用冷牙胶侧向加压法、热牙胶垂直加压法分别对单根管前磨牙进行根 管充填。应用医学3D图像编辑处理软件提取根管充填后的牙胶形态，通过特定有限元分析软件计算根管壁 应力及其位置，并且分别在距离解剖根尖3、6和9 mm处通过图像分析软件观察牙胶形态和牙本质裂纹。结 果 冷牙胶侧向加压法的牙本质裂纹明显多于热牙胶垂直加压法，所产生的根管壁应力也高于热牙胶垂 直加压法。结论 冷牙胶侧向加压法的根管壁应力高于热牙胶垂直加压法，并且易造成牙本质裂纹。

关键词: 热牙胶, 三维有限元, 应力分析, 根管充填, 牙本质裂纹