Evaluation of Two Trephine Techniques for Removal of Fractured Rotary Nickel-titanium Instruments from Root Canals
Evaluation of Two Trephine Techniques for Removal of Fractured Rotary Nickel-titanium Instruments from Root Canals
复制标题
两种环锯技术从根管中取出断裂旋转镍钛器械的评价
DOI：
10.1016/j.joen.2016.09.001
复制
发表时间：
2017-01-01
影响因子：
4.2
通讯作者：
Haapasalo, Markus
中科院分区：
文献类型：
--
作者：
Yang, Qian;Shen, Ya;Haapasalo, Markus
简介：本体外研究的目的是评价在尝试使用微型计算机断层扫描成像去除骨折锉碎片时，使用超声尖端或环锯钻在下颌磨牙近中根管内使用2种环钻技术对根面牙本质的影响。方法：选择近中根管解剖结构相似的患牙21颗。在距离根管口顶部5 mm的每个近中颊根和近中舌根管中，10根锉刀尺寸25/.06的4 mm顶端段断裂。在日冕上准备了一个平台！然后使用超声波或新的环锯钻技术暴露1- 1.5 mm长的碎片。如果通过超声或环锯钻暴露无法取出断裂的手术工具，则使用微管器械连接并取出碎片。取出断裂器械前后进行Micro-CT扫描。用图像分析软件测量根管体积、直径和根分叉牙本质厚度。记录取出器械碎片所需的时间。结果采用配对t检验进行统计学分析。结果如下：环钻法对根管体积、直径和根分叉牙本质厚度的影响均小于超声法（P
Introduction: The aim of this in vitro study was to evaluate the effects on root dentin of 2 trephining techniques using an ultrasonic tip or a trepan bur in the mesial canals of mandibular molars during attempts to remove fractured file fragments using micro-computed tomographic imaging. Methods: Twenty-one teeth with a similar anatomic configuration in mesial (buccal and lingual) canals were selected. A 4-mm apical segment of 10 file size 25/.06 was fractured in each mesiobuccal and mesiolingual canal 5 mm apically from the canal orifice. A staging platform was prepared at the corona! aspect of the broken instrument followed by either ultrasonics or a new trepan bur technique to expose a 1- to 1.5-mm length of the fragment. If the broken instrument could not be removed by exposing it either by ultrasound or the trepan bur, a microtube device was used to attach to and withdraw the fragment. Micro-CT scanning was performed before and after removing the broken instrument. Canal volume, diameter, and furcal root dentin thickness were measured by using image analysis software. The time required for the removal of the instrument fragments was recorded. The result was statistically analyzed using the paired t test. Results: The trepan bur technique had significantly less impact on canal volume, diameter, and furcal root dentin thickness change than the ultrasonic technique (P