颧牙槽嵴区骨宽度及皮质骨厚度的CBCT测量分析

Bone Width and Cortical Bone Thickness of Infrazygomatic Crest Analysed with Cone Beam Computed Tomography

目的:应用锥形束CT(CBCT)测量成年人与青少年的颧牙槽嵴区域的骨宽度、皮质骨厚度及窦底高度,并评价2组的差异,为临床中颧牙槽嵴区微种植体的植入提供参考。方法:选取成年人个别正常志愿者和安氏Ⅰ类青少年患者各30例,获取其口腔颌面部CBCT扫描影像。测量颧牙槽嵴区域的骨宽度、皮质骨厚度及上颌窦底高度,并对测量数据进行统计学分析。结果:两实验组颧牙槽嵴区域均为第二前磨牙和第一磨牙之间的骨宽度最大,且每层的5个测量值均表现为随测量点向颅方移动骨宽度值逐渐减小。两实验组各层颧牙槽嵴区骨宽度与窦底高度成正相关关系。结论:成年人组各位置骨宽度平均值及皮质骨厚度平均值均较青少年组相应位置大。颧牙槽嵴区骨宽度随窦底高度增大而增大。2组样本上颌窦个体差异均非常大,植入微种植体前需拍摄CBCT以确定是否满足植入条件。

Objective：To measure the bone width,the cortical bone thickness,and the height of maxillary sinus floor of infrazygomatic crest in adults and adolescents,and to compare the specific differences between two groups by cone beam computed tomography（CBCT）.Methods：CBCT scans were taken in 30 individual normal occlusion adult volunteers and 30 adolescent ClassⅠ patients.Multiple measurements were performed at infrazygomatic crest.The data were analyzed statistically.Results：The maximum width of infrazygomatic crest in adults and adolescents all located at the interradicular space of the maxillary second premolar and first molar.Thereafter,the values decreased gradually from root tips to basis cranii in every slice.The height of the maxillary sinus floor and infrazygomatic crest width in every slice showed a positive correlation.Conclusion：The bone width and cortical bone thickness of infrazygomatic crest in adults are thicker than those in adolescents.The infrazygomatic crest width becomes thicker as the height of maxillary sinus floor increases.Individual differences exist in the height of maxillary sinus floor.CBCT is needed in this region before inserting micro-implant anchorage.