Angle Orthod. 2022 Nov 1;92(6):722-727. doi: 10.2319/021122-128.1.
To determine the accuracy of three-dimensional (3D) printed models fabricated from cone-beam computed tomography (CBCT) scans of human mandibular dry skulls in comparison with models derived from intraoral scanner (IOS) data.
Six human mandibular dry skulls were scanned by IOS and CBCT. Digital models (DMs) constructed from the IOS and CBCT data were fabricated physically using a 3D printer. The width and thickness of individual teeth and intercanine and molar widths were measured using a digital caliper. The accuracy of the DMs was compared between IOS and CBCT. Paired t-tests were used for intergroup comparisons.
All intraclass correlation coefficient values for the three measurements (mesial-distal, buccal-lingual, width) exceeded 0.9. For the mandibular teeth, there were significant discrepancies in model accuracy between the IOS (average discrepancies of 0.18 ± 0.08 mm and 0.16 ± 0.12 mm for width and thickness, respectively) and CBCT (0.28 ± 0.07 mm for width, 0.37 ± 0.2 mm for thickness; P < .01). Intercanine (P = .38) and molar widths (P = .41) showed no significant difference between groups.
There was a statistically significant difference in the accuracy of DMs obtained from CBCT and IOS; however, this did not seem to result in any important clinical difference. CBCT could be routinely used as an orthodontic diagnostic tool and for appliance construction.
比较从锥形束 CT（CBCT）扫描的人类下颌干颅骨与从口内扫描仪（IOS）数据得出的模型，确定由这些数据制成的三维（3D）打印模型的准确性。
6 个人类下颌干颅骨通过 IOS 和 CBCT 进行扫描。使用 3D 打印机物理构建来自 IOS 和 CBCT 数据的数字模型（DM）。使用数字卡尺测量单个牙齿的宽度和厚度以及牙间和磨牙宽度。比较 IOS 和 CBCT 之间 DM 的准确性。使用配对 t 检验进行组间比较。
三种测量值（近远中、颊舌、宽度）的所有组内相关系数值均大于 0.9。对于下颌牙齿，IOS（宽度的平均差异为 0.18 ± 0.08mm 和 0.16 ± 0.12mm，厚度）和 CBCT（宽度为 0.28 ± 0.07mm，厚度为 0.37 ± 0.2mm；P <.01）之间模型准确性存在显著差异。牙间（P =.38）和磨牙宽度（P =.41）组间无显著差异。
CBCT 和 IOS 获得的 DM 的准确性存在统计学显著差异；然而，这似乎并没有导致任何重要的临床差异。CBCT 可常规用于正畸诊断工具和矫正器的制作。
