Faculty of Dentistry, Assiut University, Assiut, Egypt.
Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
BMC Oral Health. 2022 May 31;22(1):214. doi: 10.1186/s12903-022-02245-8.
This in vitro study aims to compare rotary files (Fanta and Zuanba) with manual K files according to the amount of dentin removed and canal transportation in primary mandibular second molars by CBCT images.
This experimental study was conducted on 60 extracted human second primary molars. That were divided into three groups according to root canal preparation group "I" instrumented with manual K-files, group "II" instrumented with rotary Fanta files, and group "III" instrumented with rotary Zuanba files. After root canal preparation, teeth were scanned before and after mechanical preparation with CBCT scanner. Then the amount of dentin removed was determined at three levels, including the coronal, middle and apical levels. Data were statically analysed using the Kruskal-Wallis test.
No statistically significant difference in the amount of dentin removed were noted between the manual and the rotary groups at the coronal and apical RC levels (P = 0.420) and (P = 0.819) respectively but significant difference was noted at the middle third (P = 0.043). Regarding RC transportation, no significant difference was noted among the three groups with the exception of the apical RC level (P = 0.043).
Although no significant differences were noted between rotary and manual files, the rotary files showed better performance.
本体外研究旨在通过 CBCT 图像比较手动 K 锉和 Fanta、Zuanba 机用镍钛锉预备下颌第二乳磨牙根管时的根管预备后牙本质去除量和根管偏移。
本实验研究纳入 60 颗拔除的人第二乳磨牙，根据根管预备方法分为三组：“I”组手动 K 锉预备，“II”组 Fanta 机用镍钛锉预备，“III”组 Zuanba 机用镍钛锉预备。根管预备后，使用 CBCT 扫描机在机械预备前后对牙齿进行扫描。然后在三个水平（冠方、中间和根尖）确定牙本质去除量。使用 Kruskal-Wallis 检验对数据进行统计学分析。
在根管冠方和根尖预备水平（RC），手动组和旋转组在牙本质去除量方面无统计学差异（P=0.420）和（P=0.819），但在根管中间段有统计学差异（P=0.043）。关于 RC 偏移，除根尖 RC 水平外（P=0.043），三组间无统计学差异。
尽管手动和旋转锉之间没有显著差异，但旋转锉的表现更好。
