Abstract：
BACKGROUND: Apically extruded debris can be affected by some features of the file systems such as kinematics or metallurgic properties.
OBJECTIVE: This in vitro study aimed to evaluate the effect of movement kinematics (reciprocation or rotation) and heat-treated alloys (C.Wire) on the amount of debris extrusion.
METHODS: Seventy-two mesiobuccal root canals were assigned into three experimental groups related to the single-file system used (n = 24): two rotational; One Shape (Conventional Ni-Ti), One Curve (C.Wire), and one reciprocating; and One Reci (C.Wire). The file systems were used according to the advisable speed and torque according to the manufacturers\' suggestion. The weight of debris was calculated by subtracting the preweights from postweights of Eppendorf tubes. Kruskall-Wallis and Mann-Whitney U tests were used to analyze the data (P = 0.05).
RESULTS: One Shape produced the greatest amount of extruded debris compared with One Curve (P < 0.001) and One Reci (P < 0.001), respectively. No statistical difference was found between One Curve and One Reci concerning amount of apical debris extrusion (P = 0.489).
CONCLUSIONS: Metallurgical properties of files may affect apical debris extrusion. Alloy type is an important factor in the amount of debris extrusion. File kinematics does not affect apical debris extrusion.
OBJECTIVE: This in vitro study aimed to evaluate the effect of movement kinematics (reciprocation or rotation) and heat-treated alloys (C.Wire) on the amount of debris extrusion.
METHODS: Seventy-two mesiobuccal root canals were assigned into three experimental groups related to the single-file system used (n = 24): two rotational; One Shape (Conventional Ni-Ti), One Curve (C.Wire), and one reciprocating; and One Reci (C.Wire). The file systems were used according to the advisable speed and torque according to the manufacturers\' suggestion. The weight of debris was calculated by subtracting the preweights from postweights of Eppendorf tubes. Kruskall-Wallis and Mann-Whitney U tests were used to analyze the data (P = 0.05).
RESULTS: One Shape produced the greatest amount of extruded debris compared with One Curve (P < 0.001) and One Reci (P < 0.001), respectively. No statistical difference was found between One Curve and One Reci concerning amount of apical debris extrusion (P = 0.489).
CONCLUSIONS: Metallurgical properties of files may affect apical debris extrusion. Alloy type is an important factor in the amount of debris extrusion. File kinematics does not affect apical debris extrusion.
摘要：
背景:顶部挤出的碎片可能受到文件系统的一些特征(例如运动学或冶金性质)的影响。
目的：这项体外研究旨在评估运动运动学（往复运动或旋转）和热处理合金（C.线)上的碎片挤出量。
方法：将72个近颊根管分为与所使用的单文件系统相关的三个实验组（n=24）：两个旋转；一个形状（常规Ni-Ti），一条曲线(C.Wire),和一个往复式；和一个Reci(C.电线）。根据制造商的建议，根据适当的速度和扭矩使用文件系统。通过从Eppendorf管的后重量中减去前重量来计算碎片的重量。使用Kruskall-Wallis和Mann-WhitneyU检验对数据进行分析(P=0.05)。
结果：与OneCurve（P<0.001）和OneReci（P<0.001）相比，OneShape产生了最大量的挤出碎片，分别。在根尖碎片挤出量方面，OneCurve和OneReci之间无统计学差异（P=0.489）。
结论：牙线的冶金特性可能会影响根尖碎片的挤出。合金类型是影响碎片挤压量的重要因素。文件运动学不影响根尖碎片挤出。
目的：这项体外研究旨在评估运动运动学（往复运动或旋转）和热处理合金（C.线)上的碎片挤出量。
方法：将72个近颊根管分为与所使用的单文件系统相关的三个实验组（n=24）：两个旋转；一个形状（常规Ni-Ti），一条曲线(C.Wire),和一个往复式；和一个Reci(C.电线）。根据制造商的建议，根据适当的速度和扭矩使用文件系统。通过从Eppendorf管的后重量中减去前重量来计算碎片的重量。使用Kruskall-Wallis和Mann-WhitneyU检验对数据进行分析(P=0.05)。
结果：与OneCurve（P<0.001）和OneReci（P<0.001）相比，OneShape产生了最大量的挤出碎片，分别。在根尖碎片挤出量方面，OneCurve和OneReci之间无统计学差异（P=0.489）。
结论：牙线的冶金特性可能会影响根尖碎片的挤出。合金类型是影响碎片挤压量的重要因素。文件运动学不影响根尖碎片挤出。
