摘要
目的推介一种新的准确评价上下颌骨矢状向关系的头影测量方法:β角。方法β角由A点、B点、髁状突中点三个骨性标志点构成,测量值反应上下颌骨在矢状方向的不调;样本选取137名患者,按照3 项标准分三组,分别反应三种错类型,并计算均数和标准差。结果安氏Ⅰ类错β值为36.42°±3.33,安氏Ⅱ类错的β值为26.88°±6.81,安氏Ⅲ类错的β值为45.36°±3.68;各组β值在性别上没有显著性差异。结论β角能反应上下颌骨的矢状关系,β值在33°-39°之间为安氏Ⅰ类错畸形,安氏Ⅱ类错β角较锐,安氏Ⅲ类错患者的β角较钝。
Objective The purpose of this study was to establish a new cephalometric measurement, named the β angle, to assess the sagittal jaw relationship with accuracy and reproducibility. Methods β angle was composed of 3 skeletal landmarks-point A, point B, and the apparent axis of the condyle-to measure an angle that indicates the severity and the type of skeletal dysplasia in the sagittal dimension. 137 pretreatment cephalometric radiographs of patients were selected on the basis of 3 criteria that indicate three skeletal pattern, divided into three groups.the mean and the SD for the β angle were calculated. Results The results showed that a patient with a β angle between 33° and 39° can be considered to have a Class Ⅰ skeletal pattern. A more acute β angle indicates a Class Ⅱ skeletal pattern, and a more obtuse β angle indicates a Class Ⅲ skeletal pattern. Conclusions 1.The β angle was developed as a diagnostic aid to evaluate the sagittal jaw relationship more consistently.2. Subjects with a β angle between 33° and 39° have a class Ⅰ skeletal pattern; a β angle less than 33° indicates a Class Ⅱ skeletal pattern, and a β angle greater than 39° indicates a Class Ⅲ skeletal pattem.3.There is no statistically significant difference between mean Beta angle values of males and females.
出处
《口腔材料器械杂志》
2005年第3期131-133,136,共4页
Chinese Journal of Dental Materials and Devices
