Ticona-Flores Jesús Miguel, Gallardo-López Nuria Esther, Diéguez-Pérez Montserrat
Complutense University of Madrid, Madrid, Spain.
European University of Madrid, Madrid, Spain.
Eur Arch Paediatr Dent. 2025 Jul 11. doi: 10.1007/s40368-025-01075-w.
To determine the root canal taper of primary maxillary molars and the degree of compatibility of various rsotary systems concerning root anatomy.
This in vitro study collected donated first and second primary molars (1 M and 2 M) with mesio-buccal (MB), disto-buccal (DB) and palatal (P) roots canal without physiological resorption, type I according to Vertucci, and root length greater than 4 mm. The teeth were mounted in silicone blocks and scanned with tomographic equipment from which images were reconstructed and analysed with the 3D-Slicer® programme, allowing for the measurement of the diameters of the root canals and the calculation of their tapers. The tapers were compared with the characteristics of the rotary systems: Endogal®, Protaper universal®, Mtwo® and Protaper Next®. MANOVA and interclass correlation coefficient (ICC) tests were used for statistical analysis.
After the analysis of 130 root canals, a mean increase in taper in the buccal-palatal (BP) direction was observed in the 2 M (MB:16.7%; DB:16.23%; P:8.86%) and the 1 M (MB: 9.75%; DB: 11.30%; P: 2.26%). In the mesiodistal (MD) direction, the 1 M exhibited an average taper of MB:6.95%, DB:4.67%, P:12.74% and in the 2 M, an average taper of 4.67% for the MB canal; 6.60%; 20.14% for DB and P canals, respectively.
The rotary files that presented the best adaptation to the diameter and taper of the root canal were Endogal® and ProTaper Universal® systems.
确定上颌乳磨牙的根管锥度以及各种旋转系统与根管解剖结构的适配程度。
本体外研究收集了捐赠的第一和第二乳磨牙（1M和2M），其近中颊根（MB）、远中颊根（DB）和腭根（P）根管无生理性吸收，根据Vertucci分类为I型，且根长大于4mm。将牙齿固定在硅橡胶块中，用断层扫描设备进行扫描，重建图像并用3D-Slicer®程序进行分析，以测量根管直径并计算其锥度。将锥度与旋转系统的特性进行比较：Endogal®、通用型ProTaper®、Mtwo®和ProTaper Next®。采用多变量方差分析和组内相关系数（ICC）检验进行统计分析。
在分析了130个根管后，观察到2M（MB：16.7%；DB：16.23%；P：8.86%）和1M（MB：9.75%；DB：11.30%；P：2.26%）在颊腭（BP）方向的锥度平均增加。在近远中（MD）方向，1M的MB根管平均锥度为6.95%，DB为4.67%，P为12.74%；2M的MB根管平均锥度为4.67%，DB为6.60%，P为20.14%。
与根管直径和锥度适配性最佳的旋转锉是Endogal®和通用型ProTaper®系统。
