Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study
Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study
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DOI：
10.1111/iej.12516
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发表时间：
2016-08-01
影响因子：
5
通讯作者：
Bjorndal, L.
中科院分区：
文献类型：
--
作者：
Buchgreitz, J.;Buchgreitz, M.;Bjorndal, L.
AimTo评估离体，准备程序的准确性计划与髓腔闭塞（PCO）的牙齿使用导轨概念的基础上锥束计算机断层扫描（CBCT）扫描合并与光学表面scan.MethodologyA共48颗牙齿安装在丙烯酸块。模拟根尖根管的残余物，制作根尖预备体，作为钻削路径的目标。对测试块进行表面扫描，并与CBCT扫描融合，制作导轨。通过导轨内的金属套筒创建钻头进入牙本质的路径。由两名检查员测量所执行钻孔路径的中心与心尖目标之间的距离。根据钻的半径（0.6mm）和X线片上刚好可见的根管半径（0.1mm）定义最大距离为0.7mm。结果钻孔路径与靶点的平均距离均小于0.7mm，拒绝零假设H-0 =0.7（CI 95%：0.31;0.49，P
AimTo evaluate exvivo, the accuracy of a preparation procedure planned for teeth with pulp canal obliteration (PCO) using a guide rail concept based on a cone-beam computed tomography (CBCT) scan merged with an optical surface scan.MethodologyA total of 48 teeth were mounted in acrylic blocks. An apical canal preparation was created to simulate remnants of an apical root canal that acted as the target for a drill path. The test blocks were surface scanned, and merged with a CBCT scan, and a guide rail was made. A pathway for the bur was created through a metal sleeve within the guide rail into dentine. The distance was measured between the centres of the performed drill path and the apical target by two examiners. A maximum distance of 0.7mm was defined based on the radius of the bur (0.6mm) and the radius of a root canal just visible on a radiograph (0.1mm). The t-test was used for evaluation, and intra- and inter-examiner reproducibility was expressed by intraclass correlation coefficients.ResultsThe mean distance between the drill path and the target was significantly lower than 0.7mm, and null hypothesis H-0: =0.7 was rejected (CI 95%: 0.31;0.49, P