Cone-beam computed tomographic evaluation of the temporomandibular joint and dental characteristics of patients with Class II subdivision malocclusion and asymmetry

Mingna Huang; Yun Hu; Jinfeng Yu; Jicheng Sun; Ye Ming; Leilei Zheng

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자료유형: 학술저널

저자정보: Mingna Huang (Chongqing Medical University) Yun Hu (Chongqing Medical University) Jinfeng Yu (Chongqing Medical University) Jicheng Sun (Chongqing Medical University) Ye Ming (Chongqing Medical University) Leilei Zheng (Chongqing Medical University)

저널정보: 대한치과교정학회 대한치과교정학회지 대한치과교정학회지 제47권 제5호

발행연도: 2017.9

수록면: 277 - 288 (12page)

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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 position of 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.

#Cone-beam computed tomography #TMJ #Asymmetry #Class II subdivision

참고문헌 (29)

참고문헌 신청

Janson G, de Lima KJ, Woodside DG, Metaxas A, de Freitas MR, Henriques JF. Class II subdivision malocclusion types and evaluation of their asymmetries. Am J Orthod Dentofacial Orthop 2007;131:57-66. Azevedo AR, Janson G, Henriques JF, Freitas MR. Evaluation of asymmetries between subjects with Class II subdivision and apparent facial asymmetry and those with normal occlusion. Am J Orthod Dentofacial Orthop 2006;129:376-83. Janson GR, Metaxas A, Woodside DG, de Freitas MR, Pinzan A. Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions. Am J Orthod Dentofacial Orthop 2001;119:406-18. Meloti AF, Goncalves Rde C, Silva E, Martins LP, dos Santos-Pinto A. Lateral cephalometric diagnosis of asymmetry in Angle Class II subdivision compared to Class I and II. Dental Press J Orthod 2014;19:80-8. Sanders DA, Rigali PH, Neace WP, Uribe F, Nanda R. Skeletal and dental asymmetries in Class II subdivision malocclusions using cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2010;138:542.e1-20; discussion 542-3.

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