The genial tubercle: A prospective novel landmark for the diagnosis of mandibular asymmetry
이승엽, 최동순, 장인산, 송근수, 차봉근,
소속 상세정보
이승엽 ( Lee Seung-Youp ) - Gangneung-Wonju National University Department of Dentistry
최동순 ( Choi Dong-Soon ) - Gangneung-Wonju National University College of Dentistry Department of Orthodontics
장인산 ( Jang In-San ) - Gangneung-Wonju National University College of Dentistry Department of Orthodontics
송근수 ( Song Geun-Su ) - Gangneung-Wonju National University College of Dentistry Department of Orthodontics
차봉근 ( Cha Bong-Kuen ) - Gangneung-Wonju National University College of Dentistry Department of Orthodontics
KMID : 0361920170470010050
Abstract
Introduction: Identifying menton (Me) on posteroanterior cephalograms and three-dimensional (3D) cone-beam computed tomography (CBCT) images is difficult, because the midpoint of the symphyseal area is not identifiable after the mandibular symphysis fuses at an early age. The aim of this study was to evaluate the reliability of the identification of the genial tubercle (GT) in patients with mandibular asymmetry and to compare it with that of the traditional landmark, Me.
Methods: The samples comprised 20 CBCT images of adults with mandibular asymmetry. Two examiners performed the identifications and measurements. Me and GT were marked, and the anteroposterior, vertical, and transverse distances to the three reference planes were measured on 3D-reconstructed CBCT images. The intra- and inter-examiner reliability of landmark identification of Me and GT were assessed using the intraclass correlation coefficient (ICC) and Bland-Altman plots.
Results: The Me and GT landmarks showed excellent reliability (ICC ≥ 0.993) three-dimensionally. In the transverse evaluation, the ICC values of the GT (range, 0.997?0.999) tended to be slightly higher than those of Me (range, 0.993?0.996). In the Bland-Altman plots for the two separate assessments, Me showed a maximum error of 1.76 mm in the transverse direction, whereas the GT showed a maximum error of 0.96 mm in the 95% limit.
Conclusions: Our results suggest that both Me and GT are clinically reliable and equally useful landmarks for the evaluation of mandibular asymmetry on CBCT images.
키워드
Cone-beam computed tomography; Three-dimensional cephalometrics; Genial tubercle; Menton
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