OBJECTIVE: To assess the plotting reproducibility of landmarks on 3-dimensional computed tomography (3D-CT) images through use of the 95% confidence ellipse in order to propose sufficiently stable coordinate systems for 3D-CT measurements. MATERIALS AND METHODS: Six dentists plotted 19 landmarks twice on 3D-CT images. Scatterplots and the 95% ellipses were produced 3-dimensionally, and the areas of the ellipses were calculated for evaluating the reproducibility of landmarks. RESULTS: The plotting reproducibility of each landmark showed characteristic features. Among five landmarks (the sella [S], nasion [N], basion [Ba], orbitale [Or], and true porion [Po]) that are frequently used as reference points on cephalograms, Ba showed the smallest areas for all three coordinate axes, indicating high reproducibility. The coronoid process (CP) and the tooth-related landmarks showed relatively high reproducibility. CONCLUSION: Sufficiently stable coordinate axes could be proposed for different treatments and studies.
OBJECTIVE: To assess the plotting reproducibility of landmarks on 3-dimensional computed tomography (3D-CT) images through use of the 95% confidence ellipse in order to propose sufficiently stable coordinate systems for 3D-CT measurements. MATERIALS AND METHODS: Six dentists plotted 19 landmarks twice on 3D-CT images. Scatterplots and the 95% ellipses were produced 3-dimensionally, and the areas of the ellipses were calculated for evaluating the reproducibility of landmarks. RESULTS: The plotting reproducibility of each landmark showed characteristic features. Among five landmarks (the sella [S], nasion [N], basion [Ba], orbitale [Or], and true porion [Po]) that are frequently used as reference points on cephalograms, Ba showed the smallest areas for all three coordinate axes, indicating high reproducibility. The coronoid process (CP) and the tooth-related landmarks showed relatively high reproducibility. CONCLUSION: Sufficiently stable coordinate axes could be proposed for different treatments and studies.
Authors: Olivier J C van Vlijmen; Frits A Rangel; Stefaan J Bergé; Ewald M Bronkhorst; Alfred G Becking; Anne Marie Kuijpers-Jagtman Journal: Clin Oral Investig Date: 2010-07-17 Impact factor: 3.573
Authors: Joorok Park; Sheldon Baumrind; Sean Curry; Sean K Carlson; Robert L Boyd; Heesoo Oh Journal: Angle Orthod Date: 2019-03-18 Impact factor: 2.079
Authors: R Olszewski; L Frison; N Schoenarts; R H Khonsari; G A Odri; F Zech; H Reychler Journal: Clin Oral Investig Date: 2016-12-21 Impact factor: 3.573