Comparison between dental and basal arch forms in normal occlusion and Class III malocclusions utilizing cone-beam computed tomography
석경은, 박재현, Bayome Mohamed, 남영옥, Sameshima Glenn T., 국윤아,
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석경은 ( Suk Kyung-Eun ) - Catholic University Seoul St. Mary’s Hospital Department of Orthodontics
박재현 ( Park Jae-Hyun ) - A.T. Still University Arizona School of Dentistry & Oral Health
( Bayome Mohamed ) - Catholic University College of Medicine Department of Dentistry
남영옥 ( Nam Young-Ok ) - Wonkwang Health Science University Department of Dental Hygiene
( Sameshima Glenn T. ) - University of Southern California School of Dentistry Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University Seoul St. Mary’s Hospital Department of Orthodontics
KMID : 0361920130430010015
Abstract
Objective: The purpose of this study was to investigate the relationship between the mandibular dental and basal arch forms in subjects with normal occlusion and compare them with those of Class III malocclusion using cone-beam computed tomography (CBCT). Methods: CBCT images of 32 normal occlusion (19 males, 13 females; 24.3 years) and 33 Class III malocclusion subjects (20 males, 13 females, 22.2 years) were selected. Facial axis and root center points were identified from the left to right mandibular first molars. Distances between the facial axis and root center points for each tooth were calculated, and 4 linear and 2 ratio variables were measured and calculated for each arch form. The variables were compared between groups by independent t-test. Pearson correlation coefficient was applied to assess the relationships between dental and basal variables within each group. Results: The mandibular dental and basal intercanine widths were significantly greater in the Class III group than in normal occlusion subjects (p < 0.05). The dental and basal intercanine widths as well as the dental and basal intermolar widths were strongly correlated in normal occlusion and moderately correlated in Class III malocclusion. Conclusions: The dental arch form demon strated a strong positive correlation with the basal arch form in the normal occlusion group and moderate correlation in the Class III malocclusion group. These results might be helpful for clinicians to have a better understanding of the importance of basal arch form in the alveolar bone.
키워드
Dental arch form; Basal arch form; Normal occlusion; Class III malocclusion; Cone-beam computed tomography
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