Endodontic Department, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Private Practice, Tabriz, Iran.
Clin Exp Dent Res. 2022 Dec;8(6):1421-1425. doi: 10.1002/cre2.660. Epub 2022 Sep 2.
Root canal preparation can lead to cracks on the roots by creating stresses on the root canal walls, which decreases the fracture resistance of the tooth. The present study compared the fracture resistance of the teeth prepared by the ProTaper Universal (PTU), ProTaper Next (PTN), and ProTaper Gold (PTG) rotary file systems.
Fifty-six single-canal premolar teeth were sectioned 14 mm from the root apex. The roots were standardized based on the buccolingual and mesiodistal diameter and randomly assigned to three experimental (n = 14) and one control group (n = 14). The teeth in three experimental groups were instrumented with PTU, PTN, and PTG rotary files. The roots in the control group were not instrumented. A vertical force was applied to each root in a universal testing machine until the root fractured. The data were statistically analyzed by one-way analysis of variance.
There was no significant difference in the fracture resistance of the teeth between the control, PTU, PTN, and PTG groups (p = .115).
Root canal preparation with ProTaper files manufactured with conventional NiTi (PTU) and heat-treated alloys (PTN and PTG) did not affect the fracture resistance of teeth.
通过在根管壁上产生应力来制备根管会导致根裂，从而降低牙齿的抗折能力。本研究比较了 ProTaper Universal（PTU）、ProTaper Next（PTN）和 ProTaper Gold（PTG）旋转锉系统预备后的牙齿的抗折能力。
将 56 颗单根管前磨牙从根尖 14mm 处截断。根据颊舌径和近远中径对牙根进行标准化，并将其随机分为三组实验组（n=14）和一组对照组（n=14）。三组实验组的牙齿分别用 PTU、PTN 和 PTG 旋转锉进行根管预备。对照组的牙齿不进行根管预备。在万能试验机上对每个牙根施加垂直力，直到牙根折断。采用单因素方差分析对数据进行统计学分析。
对照组、PTU 组、PTN 组和 PTG 组牙齿的抗折力无显著性差异（p=0.115）。
用传统镍钛（PTU）和热处理合金（PTN 和 PTG）制造的 ProTaper 锉预备根管不会影响牙齿的抗折能力。
