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Evaluation of the apical adaptation performance of various root canal instruments

机译：评估各种根管器械的根尖适应性能

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Objective:The aim of this study was to evaluate the apical root canal adaptation performance of various root canal instruments.Materials and Methods:A total of 40 freshly extracted single-rooted mandibular incisors were used in this study. Coroner parts of all teeth were removed from cemento-enamel junction and root canal of each tooth was explored with a size 8 K-file until the tip of the file was just visible at the apex. Working lengths (WLs) were determined as 1 mm short of these measurements. ProTaper, K-file, profile and hedstroem files were inserted into the root canals of 10 teeth to the WL following the flaring of the coronal and middle thirds. Instruments were fixed in the root canals with acrylic resin. The apical 1 mm of each root tip was ground on wet sandpaper to expose the canal and the instrument at the WL and the apical region of each tooth was examined under stereomicroscope. The stereoscopic images of the teeth were digitized and analyzed with software in order to determine the differences between the areas of root canals and file tips. Result data were analyzed using the one-way analysis of variance test (P = 0.05).Results:There were no significant differences between apical file/root canal areas of the evaluated instruments (P > 0.05).Conclusions:None of the evaluated instruments performed a perfect adaptation with the apical root canal surface at the WL in mandibular incisors. Therefore, total removal of the debris from the apical canal surface may not be achieved when these filing instruments are used.
机译：目的：本研究旨在评估各种根管器械的根尖根管适应性能。材料与方法：本研究共使用40根新鲜提取的单根下颌切牙。从牙釉质牙釉质交界处取下所有牙齿的死因部位，并用8 K大小的锉刀探查每颗牙齿的根管，直到在根尖处可见锉刀的尖端。工作长度（WLs）被确定为比这些测量值短1毫米。将ProTaper，K锉刀，齿形和hestroem锉刀在冠状和中间三分之二张开后，插入到WL的10个牙齿的根管中。用丙烯酸树脂将器械固定在根管中。在湿砂纸上将每个根尖的1 mm尖磨碎，以暴露出根管，并在WL处对器械进行检查，并在立体显微镜下检查每个牙齿的根尖区域。对牙齿的立体图像进行数字化处理，并使用软件进行分析，以确定牙根管和锉刀尖端之间的差异。结果数据采用单因素方差分析进行分析（P = 0.05）。结果：被评估器械的根尖/根管区域之间无显着差异（P> 0.05）。结论：被评估器械均无对下颌切牙的WL根尖根管表面进行了完美的适应。因此，当使用这些锉器械时，可能无法从根管表面完全清除碎屑。

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