Cone-beam computed tomographic evaluation of the temporomandibular joint and dental characteristics of patients with Class II subdivision malocclusion and asymmetry
Huang Ming Na, Hu Yun, Yu Jin Feng, Sun Ji Cheng, Ming Ye, Zheng Lei Lei,
소속 상세정보
( Huang Ming Na ) - Chongqing Medical University Affiliated Stomatology Hospital
( Hu Yun ) - Chongqing Medical University Affiliated Stomatology Hospital
( Yu Jin Feng ) - Chongqing Medical University Affiliated Stomatology Hospital
( Sun Ji Cheng ) - Chongqing Medical University Affiliated Stomatology Hospital
( Ming Ye ) - Chongqing Medical University Affiliated Stomatology Hospital
( Zheng Lei Lei ) - Chongqing Medical University Affiliated Stomatology Hospital
KMID : 0361920170470050277
Abstract
Objective: Treating Class II subdivision malocclusion with asymmetry has been a challenge for orthodontists because of the complicated characteristics of asymmetry. This study aimed to explore the characteristics of dental and skeletal asymmetry in Class II subdivision malocclusion, and to assess the relationship between the condyle-glenoid fossa and first molar.
Methods: Conebeam computed tomographic images of 32 patients with Class II subdivision malocclusion were three-dimensionally reconstructed using the Mimics software. Forty-five anatomic landmarks on the reconstructed structures were selected and 27 linear and angular measurements were performed. Paired-samples t -tests were used to compare the average differences between the Class I and Class II sides; Pearson correlation coefficient (r) was used for analyzing the linear association.
Results: The faciolingual crown angulation of the mandibular first molar (p < 0.05), sagittal position of the maxillary and mandibular first molars (p < 0.01), condylar head height (p < 0.01), condylar process height (p < 0.05), and angle of the posterior wall of the articular tubercle and coronal positionof the glenoid fossa (p < 0.01) were significantly different between the two sides. The morphology and position of the condyle-glenoid fossa significantly correlated with the three-dimensional changes in the first molar.
Conclusions: Asymmetry in the sagittal position of the maxillary and mandibular first molars between the two sides and significant lingual inclination of the mandibular first molar on the Class II side were the dental characteristics of Class II subdivision malocclusion. Condylar morphology and glenoid fossa position asymmetries were the major components of skeletal asymmetry and were well correlated with the three-dimensional position of the first molar.
키워드
Cone-beam computed tomography; TMJ; Asymmetry; Class II subdivision
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