Selvakumar Haridoss, Kavitha Swaminathan, Thomas Eapen, Anadhan Vasanthakumari, Vijayakumar Rajendran
Reader, Department of Pedodontics, Sri Ramachandra University , Chennai, Tamil Nadu, India .
Professor, Department of Paedodontia, Dr. Sunny Medical Centre , UAE .
J Clin Diagn Res. 2016 Jan;10(1):ZC05-8. doi: 10.7860/JCDR/2016/14183.7028. Epub 2016 Jan 1.
The intention of root canal preparation is to reduce infected content and create a root canal shape allowing for a well condensed root filling. Therefore, it is not necessary to remove excessive dentine for successful root canal preparation and concern must be taken not to over instrument as perforations can occur in the thin dentinal walls of primary molars.
This study was done to evaluate the time preparation, the risk of lateral perforation and dentine removal of the stainless steel K file and K3 rotary instrumentation in primary teeth.
Seventy-five primary molars were selected and divided into three groups. Using spiral computed tomography the teeth were scanned before instrumentation. Teeth were prepared using a stainless steel K file for manual technique. All the canals were prepared up to file size 35. In K3 rotary files (.02 taper) instrumentation was done up to 35 size file. In K3 rotary files (.04 taper) the instrumentation was done up to 25 size file and simultaneously the instrumentation time was recorded. The instrumented teeth were once again scanned and the images were compared with the images of the uninstrumented canals.
Data was statistically analysed using Kruskal Wallis One-way ANOVA, Mann-Whitney U-Test and Pearson's Chi-square Test.
K3 rotary files (.02 taper) removed a significantly less amount of dentine, required less instrumentation time than a stainless steel K file.
K3 files (.02 taper) generated less dentine removal than the stainless steel K file and K3 files (.04 taper). K3 rotary files (.02 taper) were more effective for root canal instrumentation in primary teeth.
根管预备的目的是减少感染物质，并形成一种能使根管充填致密的根管形态。因此，对于成功的根管预备而言，没有必要去除过多的牙本质，并且必须注意避免过度器械操作，因为在乳牙薄壁牙本质中可能会发生穿孔。
本研究旨在评估不锈钢K锉和K3旋转器械在乳牙根管预备中的预备时间、侧穿风险及牙本质去除情况。
选取75颗乳牙并分为三组。在器械操作前，使用螺旋计算机断层扫描对牙齿进行扫描。采用不锈钢K锉进行手动技术预备牙齿。所有根管均预备至35号锉。对于K3旋转锉（0.02锥度），器械操作至35号锉。对于K3旋转锉（0.04锥度），器械操作至25号锉，并同时记录器械操作时间。对已进行器械操作的牙齿再次进行扫描，并将图像与未进行器械操作的根管图像进行比较。
使用Kruskal Wallis单向方差分析、Mann-Whitney U检验和Pearson卡方检验对数据进行统计分析。
K3旋转锉（0.02锥度）去除的牙本质量显著少于不锈钢K锉，所需的器械操作时间也更少。
K3锉（0.02锥度）比不锈钢K锉和K3锉（0.04锥度）去除的牙本质更少。K3旋转锉（0.02锥度）在乳牙根管器械操作中更有效。
