[动态导航评估不同深度环钻钻针的定位精度]
[ evaluation of positioning accuracy of trephine bur at different depths by dynamic navigation].
作者信息
Liu S M, Zhao Y J, Wang X Y, Wang Z H
机构信息
Department of Conservative Dentistry and Endodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing 100081, China.
Center for Digital Dentistry, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing 100081, China.
出版信息
Beijing Da Xue Xue Bao Yi Xue Ban. 2022 Feb 18;54(1):146-152. doi: 10.19723/j.issn.1671-167X.2022.01.023.
OBJECTIVE
To evaluate the accuracy of trephine bur drilling at different depths guided by dynamic navigation system in 3D printing model.
METHODS
A model at the depth of 5 mm, 10 mm, and 15 mm from the outer surface of which hemispherical cavities was reserved and the 3D printing technology was used to make the standardized model with Veroclear resin. The cone beam CT (CBCT) was taken and the data were imported into the dynamic navigation software (DCARER, China) to establish navigation path programming. Under the guidance of dynamic navigation, a trephine bur with a diameter of 4.5 mm was used to complete the access operation. At each depth, 10 approaches were completed. The postoperative model CBCT was taken. The approach trajectory under navigation was reconstructed and compared with the designed path. The two-dimensional distance deviation, depth deviation, three-dimensional distance deviation, and angle deviation between the actually prepared path and the designed path were calculated.
RESULTS
At the depth of 5 mm, the two-dimensional distance deviation between the end position of the prepared path and the designed path was (0.37±0.06) mm, the depth deviation was (0.06±0.05) mm, the three-dimensional distance deviation was (0.38±0.07) mm, and the angle deviation was 2.46°±0.54°; At the depth of 10 mm, the four deviations between the end position of prepared path and the designed path were (0.44±0.05) mm, (0.16±0.06) mm, (0.47±0.05) mm, and 2.45°±1.21°, respectively; At the depth of 15 mm, the four deviations were (0.52±0.14) mm, (0.16±0.07) mm, (0.55±0.15) mm, and 3.25°±1.22°, respectively. With the increase of entry depth, the three-dimensional and depth accuracy of dynamic navigation system decreased ( < 0.01), and the positioning angle deviation had no relation with the entry depth (>0.01).
CONCLUSION
Dynamic navigation technology can achieve high positioning accuracy in the depth range of 15 mm, but its deviation increases with the increase of entry depth.
目的
评估在3D打印模型中，动态导航系统引导下不同深度环钻钻孔的准确性。
方法
制作一个距外表面深度分别为5mm、10mm和15mm的模型，模型上预留半球形腔，采用3D打印技术用Veroclear树脂制作标准化模型。进行锥形束CT（CBCT）扫描，将数据导入动态导航软件（DCARER，中国）以建立导航路径规划。在动态导航引导下，使用直径4.5mm的环钻完成入路操作。每个深度完成10次入路。术后进行模型CBCT扫描。重建导航下的入路轨迹并与设计路径进行比较。计算实际制备路径与设计路径之间的二维距离偏差、深度偏差、三维距离偏差和角度偏差。
结果
在5mm深度时，制备路径终点位置与设计路径的二维距离偏差为（0.37±0.06）mm，深度偏差为（0.06±0.05）mm,三维距离偏差为（0.38±0.07）mm，角度偏差为2.46°±0.54°；在10mm深度时，制备路径终点位置与设计路径的上述四个偏差分别为（0.44±0.05）mm、（0.16±0.06）mm、（0.47±0.05）mm和2.45°±1.21°；在15mm深度时，上述四个偏差分别为（0.52±0.14）mm、（0.16±0.07）mm、（0.55±0.15）mm和3.25°±1.22°。随着入路深度增加，动态导航系统的三维和深度准确性下降（<0.01），定位角度偏差与入路深度无关（>0.01）。
结论
动态导航技术在15mm深度范围内可实现较高的定位准确性，但其偏差随入路深度增加而增大。
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