锥束CT测量安氏Ⅰ类错牙合人群下颌髁突的体积和表面积

Condyle volume and surface area in young Chinese people with Angle's class Ⅰ malocclusion:A cone-beam CT study

背景:髁突是下颌骨的生长中心,髁突的体积大小对下颌骨的形态有着密切的关系,同时各种关节疾病都会导致髁突形态的变化。目的:通过锥束CT测量年轻安氏Ⅰ类错牙合人群髁突体积和表面积,为中国人髁突体积和表面积提供正常参考值。方法:从重庆医科大学附属口腔医院正畸科就诊患者中选取年龄在18～28岁之间的年轻安氏Ⅰ类错牙合患者70例,男34例,女36例。所取患者脸型左右对称,"↓"开口型,开口度正常,无关节弹响,疼痛等症状。所有患者接受锥束CT检查,通过Mimics10.0对CT片髁突进行三维重建,计算髁突的体积,表面积以及形态指数(体积和表面积之比)。结果与结论:男性髁突体积和表面积均显著大于女性(P<0.01)。左右髁突体积和表面积差异无显著性意义(P>0.05)。左右两侧髁突形态指数和男女髁突形态学指数差异无显著性意义。结果提示脸型对称,无关节症状的安氏Ⅰ类错牙合人群左右髁突基本对称。

BACKGROUND：Condyle is the growth center of the mandible,and the size of the condyle is closely associated with the mandibular shape;while a variety of joint diseases can lead to changes in condylar shape.OBJECTIVE：To measure the condyle volume and surface area in young Chinese people with Angle＇s class Ⅰ malocclusion by cone-beam CT （CBCT）,and to provide a quantitative standards for volumetric and surface measurements of the mandibular condyle in Chinese population.METHODS：Seventy young patients with Angle＇s class Ⅰ malocclusion were chosen from the Affiliated Hospital of Stomatology,Chongqing Medical University （age range：18-28 years;34 males and 36 females）.Inclusive criteria were as follows：patients with symmetrical faces,＂↓＂ open type,opening was normal,no joint snapping,pain and other symptoms.All patients received CBCT examination,the CT slice used through the Mimics 10.0 for three-dimensional reconstruction of the condyle to measure the condyle volume,surface area and shape index （ratio of volume and surface area）.RESULTS AND CONCLUSION：The condyle volume and surface area in male patients were greater significantly than those in female patients （P〈0.01）.There were no difference between the left and right condyle in the volume and surface area （P〉0.05）.The shape index had no difference between male and female patients as well as between the left and right condyle.It is found that patients with symmetrical faces and no joint symptoms of malocclusion Angle＇s class Ⅰmalocclusion have symmetrical condyle.