Cervical vertebrae morphology in skeletal class Ⅱ and class Ⅰ malocclusion patients / 中国组织工程研究

ABSTRACT

BACKGROUND:The incidence rate of cervical abnormalities of the patients with skeletal class Ⅱ and normal occlusion has been studied abroad, but the researches on the incidence of cervical abnormalities in different malocclusion patients is rare at home. OBJECTIVE:To observe the imaging of patients with cervical abnormalities and to statistics the incidence of cervical abnormalities in different malocclusion patients through analyzing the lateral cephalogram of different malocclusion patients. METHODS:Skeletal class Ⅱ group was consisted of 93 patients, 41 male (aged 18-40 years) and 52 female (aged 22-35 years), with the A point-nasion-B point angle>5°. Class Ⅰ group was consisted of 45 patients, 31 female (aged 20-36 years) and 14 male (aged 17-38 years), with the 1°patients were taken to analyze and statistic the incidence of sub-categories of cervical abnormalities. The incidence of sub-categories of cervical abnormalities and the lateral cephalogram were measured with Logistic regression analysis. RESULTS AND CONCLUSION:Cervical abnormalities could be divided into two categoriesposterior arch developmental defects and integration, and the posterior arch developmental defects could be divided into two subclasses of spondyloschisis and hypoplasia, while the integration could be divided into two subclasses of occipitocervical fusion and interbody fusion. In the skeletal class Ⅱ group, the cervical fusion was accounted for 49%and the posterior arch developmental defect was accounted for 4%. In the skeletal class Ⅰ group, the cervical fusion was accounted for 15%and the posterior arch developmental defect was accounted for 46%, and there was significant difference in cervical fusion between two groups. The incidence rate of cervical fusion was closely related with the A point-nasion-B point angle and the A point-nasion-pogonion angle, while there was no relationship between posterior arch developmental defect and the measurements. The results indicate that cervical fusion may related with the cranial facial sagittal development, while the skul facial development wil not influence the posterior arch developmental defect.