Feng Fei, Cao Li-Qun, Zhang Qi
Department of Dentistry and Endodontics, School of Stomatology, Tongji University, Shanghai Engineering Research Center for Dental Tissue Regeneration and Restoration. Shanghai 200072, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2023 Jun;32(3):225-229.
To evaluate the shaping ability and microcrack formation of ProTaper Next (PTN) and XP-endo Shaper (XPS) systems in the mesial curved root canals of mandibular molars by using micro-CT scans.
Sixteen mandibular molars with two independent mesial root canals and curvature ranging from 25° to 35° were randomly divided into two groups. The preparation time was recorded. Pre-and-postoperative images were scanned by micro-CT. The following parameters were evaluated: canal transportation, centering ratio, changes in canal volume, canal/root width ratio and microcrack formation. SPSS 22.0 software package was used to analyze the data.
Significant difference (P＜0.05) was found for canal transportation at the section of 1, 3, 5, 7 mm from the apical foramen and centering ratio at the section of 1, 3, 7 mm from the apical foramen, where XPS files were superior. There was no significant difference for centering ratio at the section of 5 mm from the apical foramen(P＞0.05). XPS groups significantly consumed less time during the preparation(P＜0.05). There was no significant difference between the two groups for the increase amount of volume, and canal/root width ratio(P＞0.05). Both instruments did not induce new microcrack after preparation.
PTN and XPS can both shape curved canals effectively and safely. XPS showed better centering ability and reduced preparation time during preparation.
通过显微CT扫描评估ProTaper Next（PTN）和XP-endo Shaper（XPS）系统在下颌磨牙近中弯曲根管中的塑形能力和微裂纹形成情况。
将16颗具有两个独立近中根管且弯曲度在25°至35°之间的下颌磨牙随机分为两组。记录预备时间。术前和术后图像通过显微CT扫描。评估以下参数：根管偏移、定心率、根管容积变化、根管/牙根宽度比和微裂纹形成情况。使用SPSS 22.0软件包分析数据。
在距根尖孔1、3、5、7mm处的根管偏移以及距根尖孔1、3、7mm处的定心率方面存在显著差异（P＜0.05），XPS锉在这些方面更具优势。在距根尖孔5mm处的定心率无显著差异（P＞0.05）。XPS组在预备过程中显著耗时更少（P＜0.05）。两组在容积增加量和根管/牙根宽度比方面无显著差异（P＞0.05）。两种器械在预备后均未诱导出新的微裂纹。
PTN和XPS均可有效且安全地对弯曲根管进行塑形。XPS在预备过程中显示出更好的定心能力且缩短了预备时间。
