Mai Hang-Nga, Han Jung-Suk, Kim Hyeong-Seob, Park Young-Seok, Park Ji-Man, Lee Du-Hyeong
Institute for Translational Research in Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea.
J Prosthodont Res. 2023 Jan 6;67(1):138-143. doi: 10.2186/jpr.JPR_D_21_00344. Epub 2022 May 14.
This study aimed to investigate the accuracy of automatic tooth finish line registration compared to manual registration with regard to various finish line configurations and dental computer-aided design (CAD) software.
Finish line registrations were performed on 15 digital tooth models with different finish line configurations (edge roundness radius = 0 mm, 0.2 mm, and 0.4 mm; edge angle = 30°, 60°, 90°, 120°, and 150°) using automatic and manual methods for designing virtual copings (N = 150). The discrepancies between the registered finish line extracted from the copings and the actual finish line segmented from the digitized tooth model were measured. Three-way analysis of variance (ANOVA) and post-hoc analyses with Bonferroni correction (α = 0.05) were used to analyze the results.
The finish line configurations, registration methods, and CAD software interacted with the accuracy of the registered finish line (p = 0.001). The automatic finish line registration method exhibited larger error values than the manual method, especially at high finish line edge roundness and obtuse edge angles for both EXOCAD and R2CAD software (p < 0.001). The difference in dental CAD software affected the registration accuracy in the automatic method (p < 0.001), but not in the manual method (p = 0.676).
Finish line registration errors may occur when the automatic registration method is applied to the indistinct edge of tooth preparation. The accuracy of the automatic finish line registration could differ according to the CAD software program.
本研究旨在探讨在各种边缘线配置和牙科计算机辅助设计（CAD）软件条件下，自动牙齿边缘线配准相对于手动配准的准确性。
使用自动和手动方法为15个具有不同边缘线配置（边缘圆角半径 = 0毫米、0.2毫米和0.4毫米；边缘角度 = 30°、60°、90°、120°和150°）的数字牙齿模型设计虚拟全冠（N = 150），进行边缘线配准。测量从全冠中提取的配准边缘线与从数字化牙齿模型中分割出的实际边缘线之间的差异。采用三因素方差分析（ANOVA）和经Bonferroni校正（α = 0.05）的事后分析来分析结果。
边缘线配置、配准方法和CAD软件与配准边缘线的准确性存在交互作用（p = 0.001）。自动边缘线配准方法比手动方法表现出更大的误差值，尤其是对于EXOCAD和R2CAD软件，在高边缘线边缘圆角和钝角边缘角度时（p < 0.001）。牙科CAD软件的差异影响自动方法的配准准确性（p < 0.001），但不影响手动方法（p = 0.676）。
当自动配准方法应用于牙齿预备不清晰的边缘时，可能会出现边缘线配准误差。自动边缘线配准的准确性可能因CAD软件程序而异。
