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Comparison of three midsagittal planes for threedimensional cone beam computed tomography head reorientation

Korean Journal of Orthodontics 2020년 50권 1호 p.3 ~ 12
이언화 ( Lee Eon-Hwa ) - Korea University Anam Hospital Department of Orthodontics

유형석 ( Yu Hyung-Seog ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
한상선 ( Han Sang-Sun ) - Yonsei University College of Dentistry Department of Oral and Maxillofacial Radiology
 ( Jung Hwi-Dong ) - Yonsei University College of Dentistry Department of Oral and Maxillofacial Surgery
황충주 ( Hwang Chung-Ju ) - Yonsei University College of Dentistry Department of Orthodontics

Abstract


Objective: This study compared three prominent midsagittal planes (MSPs) to identify the MSP that best approximates the true symmetrical MSP.

Methods: Forty-three patients (mean age, 23.0 ± 8.20 years) were grouped as follows: group 1 consisted of 10 patients with skeletal Class I and a menton (Me) deviation of < 2 mm; group 2, 11 patients with skeletal Class III and a Me deviation < 2 mm; group 3, nine patients with skeletal Class III and a Me deviation of 2 to less than 4 mm; and group 4, 13 patients with skeletal Class III and an Me deviation ≥ 4 mm. The candidate MSPs were established by three-dimensional (3D) cone beam computed tomography (CBCT) reorientation methods (RMs): (1) the MSP perpendicular to the Frankfort horizontal (FH) plane while passing through the crista galli and basion; (2) the MSP including the nasion, incisive foramen, and basion; (3) the MSP including the nasion, anterior nasal spine, and posterior nasal spine. The mean absolute distances (MADs) to the MSPs were calculated from the coordinates of 1,548 points on 129 CBCT images. The differences in the values of the 3D coordinates among RMs were compared.

Results: The MADs of the three RMs showed significant differences (p < 0.05). Most of the differences in values of the coordinates were not significant among RMs.

Conclusions: Although the differences in distance among the three MSPs were minor, the MSP perpendicular to the FH plane while passing through the crista galli and basion best approximated the true symmetrical MSP.

키워드

3-Dimensional diagnosis and treatment planning; Facial asymmetry; 3D cephalometrics; Landmark plotting
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