Nekkanti Hemeswari, Enuganti Sridevi, Avula Jogendra Ss, Kakarla Pranitha, Siva S K, Gavarraju Deepthi N
Department of Pediatric and Preventive Dentistry, Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India.
Int J Clin Pediatr Dent. 2024 Feb;17(2):130-135. doi: 10.5005/jp-journals-10005-2760.
To determine the influence of biomechanical preparation on various parameters of root canal curvature.
A total of 72 tooth roots with moderate (10-25°) and severe canal curvature (26-75°) were selected and embedded in autopolymerizing acrylic resin for which cone-beam computed tomography (CBCT) image analysis was performed. Schneider angle, canal access angle (CAA), and the radius of curvature were determined preoperatively using auto-computer-aided design (CAD) 2021 software. Protaper gold rotary nickel-titanium (Ni-Ti) files were used to prepare the root canals. All angular and linear values were measured in auto-CAD and compared using postoperative CBCT pictures. The difference in pre- and postoperative values was assessed using paired samples -test and independent samples -test.
There was a statistically significant difference between the Schneider angle ( = 0.002), ( < 0.001), CAA ( < 0.001), ( = 0.001), and radius of curvature ( = 0.01), ( = 0.001) pre- and postoperatively in both moderate and severe canal curvature groups, respectively. This difference was greater in the severe curvature group (-value = 0.027) than in the group exhibiting moderate curvature. Among the parameters tested, Schneider angle has shown maximum difference pre- and post before and after mathematical processing (BMP) compared to other parameters.
This approach is a new and objective way of measuring root canal geometric changes. The current findings suggest that the Schneider angle, CAA, and the radius of curvature can be used as parameters to evaluate the changes in canal geometry following biomechanical preparation.
Nekkanti H, Enuganti S, Avula JSS, Assessment of Biomechanical Preparation Influence on Various Root Canal Curvatures. Int J Clin Pediatr Dent 2024;17(2):130-135.
确定生物力学预备对根管弯曲度各项参数的影响。
共选取72颗具有中度（10 - 25°）和重度根管弯曲（26 - 75°）的牙根，将其包埋于自凝丙烯酸树脂中，并进行锥束计算机断层扫描（CBCT）图像分析。术前使用自动计算机辅助设计（CAD）2021软件确定施奈德角、根管入口角（CAA）和弯曲半径。使用Protaper Gold旋转镍钛（Ni-Ti）锉对根管进行预备。所有角度和线性值均在自动CAD中测量，并使用术后CBCT图像进行比较。术前和术后值的差异采用配对样本t检验和独立样本t检验进行评估。
在中度和重度根管弯曲组中，术前和术后的施奈德角（P = 0.002）、（P < 0.001）、CAA（P < 0.001）、（P = 0.001）以及弯曲半径（P = 0.01）、（P = 0.001）均存在统计学显著差异。重度弯曲组的这种差异（P值 = 0.027）大于中度弯曲组。在测试的参数中，与其他参数相比，施奈德角在数学处理（BMP）前后显示出最大差异。
该方法是测量根管几何变化的一种新的客观方法。目前的研究结果表明，施奈德角、CAA和弯曲半径可作为评估生物力学预备后根管几何形状变化的参数。
Nekkanti H, Enuganti S, Avula JSS, 生物力学预备对各种根管弯曲度影响的评估。《国际临床儿科牙科学杂志》2024；17(2):130 - 135。
