锥形束CT测量单侧后牙正锁髁突的体积和表面积

Condylar volume and surface area in adults with unilateral scissors-bite assessed by cone-beam computed tomography

背景:髁突是下颌骨的生长发育中心,不对称的咬合关系可能会导致其形态的变化。目的:通过锥形束CT测量单侧后牙正锁髁突体积和表面积,观察单侧后牙正锁对髁突形态的影响。方法:从重庆医科大学附属口腔正畸科就诊患者中选取29例成年单侧后牙正锁患者为实验组,同期从门诊检查者中选取32例成年正常咬合为对照组,所有对象均无经正畸治疗史。拍摄锥束CT,用Mimics10.0软件对髁突影像进行三维重建。结果与结论:实验组锁侧髁突表面积和体积均大于非锁侧(P<0.05),实验组体积和表面积的不对称性指数明显大于对照组(P<0.05)。结果证实,单侧后牙正锁患者双侧髁突对称性较差。

BACKGROUND：Condyle is the growth center of the mandibular,occlusal asymmetry can cause morphologic alterations in condylar.OBJECTIVE：To investigate condylar volume and surface area of patients with unilateral scissors-bite assessed by cone-beam computed tomography and to observe the effect of unilateral scissors-bite on the morphology of condylar.METHODS：Twenty-nine adults with unilateral scissors-bite were selected as experimental group from the Department of Orthodontics,Stomatology Hospital of Chongqing Medical University.Thirty-two adults with normal occlusion were selected as control group at the same time.All the objects had no orthodontic treatment history.The cone-beam computed tomography was taken before orthodontic treatment and the measurement of volume and surface area was taken by Mimics 10.0 software.RESULTS AND CONCLUSION：In the experimental group,the condylar volume and surface area on the noscissors-bite side were smaller than those on the scissors-bite side（P 0.05）.The condylar volume and surface asymmetry index of the experimental group were significantly bigger than those of the control group（P 0.05）.Subjects with unilateral scissors-bite have asymmetrical condyles.