不同骨面型下颌颊棚区骨量的特征分析

Characteristics Analysis of Bone Quantity of Mandibular Buccal Shelf with Different Skeletal Pattern

目的:通过锥形束计算机成像技术(Cone-beam computed tomography,CBCT)对不同骨面型下颌颊棚区骨量进行分析,初步探究影响颊棚区骨量的因素,为临床中安全植入微螺钉提供指导。方法:从患者影像资料库中选取符合纳入标准的正畸患者资料120例,根据矢状骨面型分为骨性Ⅰ类组,骨性Ⅱ类组,骨性Ⅲ类组;根据垂直骨面型分为高角组,均角组,低角组。测量颊棚区磨牙近远中根平面牙槽嵴顶下3 mm、6 mm、9 mm骨厚度与骨皮质厚度,将数据进行统计学分析。结果:(1)颊棚区骨量由近中向远中逐渐增大,由牙槽嵴顶向根尖方向逐渐增大(P<0.05);(2)不同矢状骨面型患者颊棚区骨厚度存在差异(P<0.05);(3)不同垂直骨面型患者颊棚区骨厚度存在差异(P<0.05);(4)颊棚区骨厚度与ANB角呈正相关,与下颌平面角呈负相关(P<0.05)。结论:不同骨面型下颌颊棚区骨量存在差异,颊棚区骨量受矢状骨面型和垂直骨面型等因素影响,在植入微螺钉前应拍摄CBCT评估颊棚区骨量。

Objective:To analyze the bone quantity of mandibular buccal shelf with different skeletal patterns,and to explore its influencing factors.Methods:A total of 120 orthodontic patients were selected from the patient image database,and they were divided into skeletal classⅠgroup,skeletal classⅡgroup,and skeletal classⅢgroup according to the sagittal skeletal patterns;and divided into hyperdivergent group,normodivergent group,and hypodivergent group according to vertical skeletal patterns.Bone thickness and cortical bone thickness of 3mm,6mm and 9mm below the alveolar crest in the mesial and distal root plane of molars in the buccal shelf area were measured and analyzed.Results:(1)The bone quantity of buccal shelf area gradually increased from meso-middle to distal,and from alveolar crest to apical direction(P<0.05).(2)There were differences in bone thickness of buccal shelf area between different sagittal skeletal patterns(P<0.05).(3)There were differences in bone thickness of buccal shelf area between different vertical skeletal patterns(P<0.05).(4)Bone thickness of buccal shelf area was positively correlated with ANB angle,and negatively correlated with mandibular plane angle(P<0.05).Conclusion:There are differences in the bone quantity of mandibular buccal shelf in different skeletal patterns,and the bone quantity of mandibular buccal shelf is affected by sagittal and vertical skeletal patterns,etc.CBCT should be taken to evaluate the bone quantity of mandibular buccal shelf before micro-screw implantation.