Comparison of the condyle-fossa relationship between skeletal class III malocclusion patients with and without asymmetry: a retrospective three-dimensional cone-beam computed tomograpy study
Kim Hyoun-Oak, 이원, 국윤아, 김윤지,
소속 상세정보
( Kim Hyoun-Oak ) - Catholic University Graduate School of Clinical Dental Science Department of Orthodontics
이원 ( Lee Won ) - Catholic University Uijeongbu St. Mary’s Hospital Department of Oral and Maxillofacial Surgery
국윤아 ( Kook Yoon-Ah ) - Catholic University Graduate School of Clinical Dental Science Department of Orthodontics
김윤지 ( Kim Yoon-Ji ) - Catholic University Graduate School of Clinical Dental Science Department of Orthodontics
KMID : 0361920130430050209
Abstract
Objective: This study investigated whether temporomandibular joint (TMJ) condyle-fossa relationships are bilaterally symmetric in class III malocclusion patients with and without asymmetry and compared to those with normal occlusion. The hypothesis was a difference in condyle-fossa relationships exists in asymmetric patients.
Methods: Group 1 comprised 40 Korean normal occlusion subjects. Groups 2 and 3 comprised patients diagnosed with skeletal class III malocclusion, who were grouped according to the presence of mandibular asymmetry: Group 2 included symmetric mandibles, while group 3 included asymmetric mandibles. Pretreatment three-dimensional cone-beam computed tomography (3D CBCT) images were obtained. Right- and left-sided TMJ spaces in groups 1 and 2 or deviated and non-deviated sides in group 3 were evaluated, and the axial condylar angle was compared.
Results: The TMJ spaces demonstrated no significant bilateral differences in any group. Only group 3 had slightly narrower superior spaces (p < 0.001). The axial condylar angles between group 1 and 2 were not significant. However, group 3 showed a statistically significant bilateral difference (p < 0.001); toward the deviated side, the axial condylar angle was steeper.
Conclusions: Even in the asymmetric group, the TMJ spaces were similar between deviated and non-deviated sides, indicating a bilateral condyle-fossa relationship in patients with asymmetry that may be as symmetrical as that in patients with symmetry. However, the axial condylar angle had bilateral differences only in asymmetric groups. The mean TMJ space value and the bilateral difference may be used for evaluating condyle-fossa relationships with CBCT.
키워드
TMJ; Facial asymmetry; Class III diagnosis; Three-dimensional cone-beam computed tomography; Condyle-fossa relationship
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