Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea; Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea.
Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea.
Am J Orthod Dentofacial Orthop. 2020 Mar;157(3):348-356. doi: 10.1016/j.ajodo.2019.04.031.
The purpose of this study was to investigate the registration accuracy between intraoral-scanned crowns and cone-beam computed tomography (CBCT)-scanned crowns in various registration methods.
The samples consisted of 18 Korean adult patients, whose pretreatment intraoral scans and CBCT images were available. A 3-dimensional (3D) dental model was fabricated using a TRIOS intraoral scanner (3Shape, Copenhagen, Denmark) and the OrthoAnalyzer program (version 1.7.1.4; 3Shape). After the CBCT image was taken, 3D volume rendering was performed to fabricate a 3D dental model using InVivo5 software (version 5.1; Anatomage, San Jose, Calif). Registration of the 3D dental crowns made from intraoral- and CBCT-scanned images was performed with Rapidform 2006 software (Inus Technology, Seoul, Korea) by a single operator. According to registration methods, 3 groups were established: individual-arch-total-registration group, individual-arch-segment-registration group, and bimaxillary-arch-centric-occlusion-registration group (n = 18 per group). After the amounts of shell/shell deviation were obtained, the mixed model analysis of variance and Bonferroni correction were performed.
Although there was no significant difference in the registration accuracy between the individual-arch-total-registration group and individual-arch-segment-registration group, the bimaxillary-arch-centric-occlusion-registration group exhibited the lowest registration accuracy (maxillary and mandibular teeth, all 0.21 mm in the individual-arch-total-registration group; all 0.20 mm in the individual-arch-segment-registration group vs 0.26 mm and 0.25 mm in the bimaxillary-arch-centric-occlusion-registration group; P <0.001). Color-coded visualization charts exhibited that most red spots were localized on the occlusal surface of the posterior teeth in all 3 groups.
When considering the registration accuracy and convenience of the process, the individual-arch-total-registration method can be regarded as an efficient tool when integrating CBCT-scanned crown and intraoral-scanned crown.
本研究旨在探讨不同配准方法下口内扫描牙冠与锥形束 CT（CBCT）扫描牙冠的配准精度。
本研究纳入了 18 名韩国成年患者，这些患者均具有治疗前的口内扫描和 CBCT 图像。使用 TRIOS 口内扫描仪（3Shape，哥本哈根，丹麦）和 OrthoAnalyzer 程序（版本 1.7.1.4；3Shape）制作三维（3D）牙科模型。在获取 CBCT 图像后，使用 InVivo5 软件（版本 5.1；Anatomage，加利福尼亚州圣何塞）进行 3D 容积渲染以制作 3D 牙科模型。由一名操作人员使用 Rapidform 2006 软件（Inus Technology，首尔，韩国）对来自口内和 CBCT 扫描图像的 3D 牙冠进行配准。根据配准方法，将其分为 3 组：单弓全牙弓配准组、单弓分段配准组和双颌弓中心咬合配准组（每组 18 例）。获得壳层/壳层偏差量后，进行混合模型方差分析和 Bonferroni 校正。
尽管单弓全牙弓配准组和单弓分段配准组之间的配准精度没有显著差异，但双颌弓中心咬合配准组的配准精度最低（上颌和下颌牙齿，单弓全牙弓配准组均为 0.21mm；单弓分段配准组均为 0.20mm，而双颌弓中心咬合配准组为 0.26mm 和 0.25mm；P<0.001）。彩色可视化图表显示，在所有 3 组中，大多数红色斑点均定位于后牙的咬合面。
考虑到配准精度和过程的便利性，在整合 CBCT 扫描牙冠和口内扫描牙冠时，单弓全牙弓配准方法可以被视为一种有效的工具。
