A comparison between 2D and 3D cephalometry on CBCT scans of human skulls

作者：van Vlijmen O J C; Maal T; Berge S J; Bronkhorst E M; Katsaros C; Kuijpers Jagtman A M^*

来源：International Journal of Oral and Maxillofacial Surgery, 2010, 39(2): 156-160.

DOI：10.1016/j.ijom.2009.11.017

• cephalometry
• 3D-imaging
• X-ray computed tomography
• reproducibility
• orthodontics
• maxillofacial

The purpose of this study was to evaluate whether measurements oil conventional cephalometric radiographs are comparable with 3D measurements on 3D models of human skulls, derived from cone beam CT (CBCT) data. A CBCT scan and a conventional cephalometric radiograph were made of 40 dry skulls. Standard cephalometric software was used to identify landmarks oil both the 2D images and the 3D models. The same operator identified 17 landmarks oil the cephalometric radio graphs and on the 3D models. All images and 3D models were traced five times with a time-interval of I week and the mean value of repeated measurements was used for further statistical analysis. Distances and angles were calculated. Intra-observer reliability was good for all measurements. The reproducibility of the measurements oil the conventional cephalometric radiographs was higher compared with the reproducibility of measurements oil the 3D models. For a few measurements a clinically relevant difference between measurements on conventional cephalometric radiographs and 3D models was found. Measurements oil conventional cephalometric radiographs can differ significantly from measurements oil 3D models of the same skull. The authors recommend that 3D tracings for longitudinal research are not used in cases were there are only 2D records from the past.

• 出版日期2010-2