Liu Si-Min, Peng Li, Zhao Yi-Jiao, Han Bing, Wang Xiao-Yan, Wang Zu-Hua
Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China.
Fourth Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China.
Head Face Med. 2025 Apr 14;21(1):27. doi: 10.1186/s13005-025-00506-9.
The operation accuracy of dynamic navigation is affected by deviation tolerance settings. This in vitro study was aimed to assess the influence of distance and angle deviation tolerances (DDT and ADT) on positioning accuracy in endodontic surgery using dynamic navigation.
Standardized models were designed and three-dimensional (3D) printed. The drilling depth was 15 mm, where hemispherical cavities were reserved. According to the DDTs and ADTs, they were divided into five groups (n = 10), and the tolerances of distance/angle deviation were set at 0.3 mm/5°, 0.6 mm/3°, 0.6 mm/5°, 0.6 mm/7°, and 0.9 mm/5°. During navigation guidance, the operation was completed from the model surface to the cavity, the trajectory of the approach was fitted and compared with the design path, and the operational accuracy was calculated and analyzed using one-way ANOVA.
When the ADT was 5°, the positioning two-dimensional (2D) distance deviation of the DDT 0.3 mm group and the 0.6 mm group were 0.52 ± 0.14 mm and 0.50 ± 0.07 mm, respectively, smaller than 0.73 ± 0.17 mm of the 0.9 mm group (P <.01). The positioning 3D distance deviation of the 0.3 mm group and the 0.6 mm group were 0.55 ± 0.15 mm and 0.53 ± 0.07 mm, respectively, smaller than 0.74 ± 0.17 mm of the 0.9 mm group (P <.01). When the DDT was set as 0.6 mm, the positioning angle deviation of the ADT 3° group and the 5° group were 2.21 ± 0.42° and 2.60 ± 0.59°, respectively, smaller than 4.72 ± 0.64° of the 7° group (P <.01).
A 0.6 mm DDT and 5° ADT can reduce the positioning deviation of dynamic navigation and obtain better operability. The deviation tolerance of 0.6 mm/5° is suggested for application of dynamic navigation in endodontic surgery. It might improve the operation efficiency and ensure positioning accuracy.
动态导航的操作精度受偏差容限设置的影响。本体外研究旨在评估距离和角度偏差容限（DDT和ADT）对使用动态导航进行牙髓手术时定位精度的影响。
设计标准化模型并进行三维（3D）打印。钻孔深度为15mm，预留半球形腔。根据DDT和ADT将其分为五组（n = 10），距离/角度偏差容限分别设置为0.3mm/5°、0.6mm/3°、0.6mm/5°、0.6mm/7°和0.9mm/5°。在导航引导下，从模型表面向腔室完成操作，拟合进针轨迹并与设计路径进行比较，采用单因素方差分析计算并分析操作精度。
当ADT为5°时，DDT 0.3mm组和0.6mm组的定位二维（2D）距离偏差分别为0.52±0.14mm和0.50±0.07mm，小于0.9mm组的0.73±0.17mm（P＜.01）。0.3mm组和0.6mm组的定位三维（3D）距离偏差分别为0.55±0.15mm和0.53±0.07mm，小于0.9mm组的0.74±0.17mm（P＜.01）。当DDT设置为0.6mm时，ADT 3°组和5°组的定位角度偏差分别为2.21±0.42°和2.60±0.59°，小于7°组的4.72±0.64°（P＜.01）。
0.6mm的DDT和5°的ADT可减少动态导航的定位偏差并获得更好的可操作性。建议在牙髓手术中应用动态导航时采用0.6mm/5°的偏差容限。这可能提高操作效率并确保定位精度。
