两种热塑牙胶与冷牙胶侧方加压充填离体下颌中切牙的效果

Effectiveness of filling ex vivo mandibular central incisor using bypassing root canal preparation with two kinds of warm gutter fillings and cold lateral condensation technique

背景:传统的侧方加压充填,在充填时因器械滞留易形成死角,充填致密性难以得到保证。热牙胶充填是利用牙胶在加热软化时能够顺应管壁的复杂形态,进入管腔的不规则间隙,达到较理想的充填效果。目的:比较BeeFill 2 in1热牙胶充填和Obtura Ⅱ热牙胶充填与冷牙胶侧方加压充填旁路根管的效果。方法:将离体下颌扁根管中切牙60颗随机分为3个组,每组20颗,用BeeFill 2 in1热牙胶充填和Obtura Ⅱ热牙胶充填与冷牙胶侧方加压充填根管,扫描电镜观察距根尖5mm处空隙占根管横截面积的百分比。结果与结论:在体外条件下,旁路Obtura Ⅱ热牙胶充填后空隙占根管横截面积的百分比与旁路冷牙胶侧方加压充填比较,差异有显著性意义(P=0.013),旁路BeeFill 2 in1充填后空隙占根管横截面积的百分比与旁路冷牙胶侧方加压充填比较,差异有显著性意义(P=0.014);BeeFill 2 in1充填效果好于旁路Obtura Ⅱ充填但差异无显著性意义(P=0.088)。结果提示用分离器械旁建立通路并进行根管预备和BeeFill 2 in1热牙胶充填,可达到严密封闭根管的目的。

BACKGROUND：The filling compactness can not be guaranteed due to apparatus retention in traditional lateral condensation.The warm gutter filling can achieve good results because of the easy changeable of gutta-percha in softening states.OBJECTIVE：To compare the warm gutta-percha fillings（ObturaⅡand BeeFill 2 in1 filling）and cold lateral compacted gutta-percha with the bypassing root canal preparation in the intracanal separated instrument of oval canal.METHODS：Firstly,the 60 oval root canals of flat mandibular central incisors were randomly divided into three groups,with 20 teeth in each group.After that,the root canal was filled with BeeFill 2 in1,ObturaⅡcondensation,and lateral condensation.The percentage of void at 5-mm to root tip versus cross section area was observed under a scanning electron microscope.RESULTS AND CONCLUSION：Under in vitro condition,the difference of percentage of void area versus root canal area between the Obtura Ⅱ condensation group and the lateral condensation group had significance（P=0.013）,and the similar difference could be found between the BeeFill 2 in1 condensation group and the lateral condensation group（P=0.014）,but the difference had no significance between the BeeFill 2 in1 condensation group and the Obtura Ⅱ condensation group（P=0.088）.The results revealed that the root canal can be sealed accurately when establish hypass root next to the separated instrument and filled with BeeFill 2 in1 warm gutter filling.