应用锥体束CT对少年期中切牙冠根角度的研究

目的:研究少年期上?下中切牙的冠根角度,并探讨与其相关的硬组织测量指标?方法:对42例符合纳入标准的错■畸形患者的锥体束CT(CBCT)进行评估,应用MIMICS 10.0软件使用2种方法测量168颗中切牙的冠根角度,并对42例患者进行CBCT三维和头颅侧位片二维头影测量,应用SPSS21.0统计软件对两种方法定义的上?下中切牙的冠根角度与8项常用的硬组织测量指标进行Spearman 相关性分析?结果:少年期,上中切牙crm角与8项硬组织测量项目间无显著相关性;上中切牙cr角与上中切牙唇倾度呈正相关,与SNA角呈负相关;下中切牙crm角和cr角均与ANB角和下中切牙唇倾度呈正相关?结论:头影测量中部分硬组织测量指标与少年期上下中切牙冠根角度有相关性,对临床具有参考价值?

Cone beam computed tomography applied for crown-root angle of central incisor in early youth

Objective:To investigate the crown-root an-gle of central incisor of early youth,and to analyze its correlation with cephalometric measurement of hard tissue. Methods:Forty-two malocclusion pations were enrolled to measure the crown-root angle of the 168 central incisors with MIMICS 10.0 software,and to measure three-dimensional and lateral cephalogram two-dimensional SPSS21.0 statistical software was used for the analysis of the correlationship between the crown-root angle and the results of cephalometric measurement. Results:In early youth,there is no significant correlation between the crm angle of the upper central incisor with the 8 cephalometric indexes. The cr angle of the upper central incisor is positively associated with the protrusion of upper central insicor,and is negatively correlated with SNA. The crm angle and the cr angle of the lower central incisor are positively associated with ANB and the protrusion of the lower central insicor. Conclusion:Some cephalometric indexes of hard tissue are related to the crown-root angle of central incisor of early youth,which has the clinical reference value.