Botros Merna Mamdouh, ElBatouty Kariem Mostafa, Abdelrahman Tariq Yehia
Endodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
BMC Oral Health. 2025 Jul 16;25(1):1173. doi: 10.1186/s12903-025-06534-w.
Dental rotary instruments can be applied under multiple canal conditions. This study assessed the performance of two batches of NiTi dental rotary files-Mani Jizai (Jz) and Dentsply ProTaper Next (PTN)-by evaluating their cutting efficiency.
A total of 80 files (40 from each type), with 8x digital microscope magnification used for defect inspection, were tested half of which before and the other half after sterilization. The sample size was tested in extracted upper molars' distobuccal (DB) roots to assess cutting efficiency by volumetric changes showing removed dentin volume.
The Results indicated that the sterilized PTN files performed better at 5 mm, but no significant differences were noted at 10 mm between all file groups. At 15 mm, the performance of sterilized PTN files was inferior to that of non-sterilized Jz files.
Sterilization and heat treatment affect file cutting efficiency by volumetric changes, especially at the coronal and apical one-thirds.
牙科旋转器械可在多种根管条件下使用。本研究通过评估两种镍钛合金牙科旋转锉——马尼机在用（Jz）和登士柏ProTaper Next（PTN）的切割效率，来评价它们的性能。
总共80支锉（每种类型40支），在8倍数码显微镜放大倍数下用于缺陷检查，其中一半在灭菌前测试，另一半在灭菌后测试。样本在拔除的上颌磨牙远中颊根（DB）中进行测试，通过显示去除牙本质体积的体积变化来评估切割效率。
结果表明，灭菌后的PTN锉在5毫米处表现更好，但所有锉组在10毫米处未观察到显著差异。在15毫米处，灭菌后的PTN锉的性能不如未灭菌的Jz锉。
灭菌和热处理通过体积变化影响锉的切割效率，尤其是在冠部和根尖三分之一处。
