锥形束CT测量不同上颌第二磨牙萌出阶段的青少年颧牙槽嵴区骨厚度  

An evaluation of infrazygomatic crest bone thickness in adolescents at different eruption stages of the maxillary second molar detected by cone beam CT

作　　者：潘颖丹 郑章龙 毕玮 PAN Ying-dan;ZHENG Zhang-long;BI Wei(Department of Stomatology,Zhongshan Hospital(Xiamen Branch),Fudan University,Xiamen 361015,Fujian Province,China;Department of Stomatology,Zhongshan Hospital,Fudan University,Shanghai 200032,China)

机构地区：[1]复旦大学附属中山医院厦门医院口腔科,厦门361015 [2]复旦大学附属中山医院口腔科,上海200032

出　　处：《复旦学报（医学版）》2024年第4期580-587,共8页Fudan University Journal of Medical Sciences

基　　金：福建省自然科学基金面上项目(2022J011424)。

摘　　要：目的探究不同上颌第二磨牙萌出阶段的青少年颧牙槽嵴区(infrazygomatic crest,IZC)骨厚度分布规律与差异,为微种植支抗植入提供参考。方法回顾性分析110名正常颌青少年颌面部锥形束CT影像资料,根据上颌第二磨牙萌出阶段由早至晚分为S1(44例)、S2(30例)、S3(36例)3组。将过左侧上颌第一磨牙近中颊尖的水平横断面定义为水平基准面(horizontal base plane,HB)。选取左侧上颌第一磨牙近中颊根与远中颊根两个冠状截面,分别在HB上方13(HB13)、15(HB15)、17(HB17)mm高度,呈龈向60°角测量颊侧牙槽骨骨厚度。分别比较近、远中根与不同高度下的骨厚度,并比较3组在各植入路径的骨厚度差异。使用色彩映射图展示3组骨厚度分布。结果3组骨厚度测量结果在HB13与HB15高度上均表现为远中颊根骨厚度大于近中颊根。随着高度的增加,骨厚度逐渐减小(P<0.05)。组间分析显示骨厚度在HB13与HB15高度上表现为S1>S2>S3。骨厚度最大值在S1组的远中颊根HB13高度上(5.20 mm),最小值在S2组远中颊根HB17高度上(1.90 mm)。结论3组青少年的IZC骨厚度均表现为在上颌第一磨牙远中颊根的HB13高度处最大,随着高度增加,骨厚度减少。上颌第二磨牙处于的萌出阶段越晚,IZC骨厚度越少,微种植支抗植入难度增加。Objective To explore the distribution and difference of bone thickness in the infrazygomatic crest(IZC)in adolescents at different eruption stages of the maxillary second molar and provide guidance for placement of orthodontic IZC miniscrew.Methods Cone beam CT scans of 110 adolescents with normal occlusion were assessed.According to the eruption stage of the maxillary second molar,the subjects were divided into 3 groups of S1(44 cases),S2(30 cases),and S3(36 cases).The horizontal base plane(HB)in this study was defined as a horizontal axial section with the mesiobuccal cusps of the left maxillary first molar on.Two coronal slices of interest were selected which passing through the apex of mesiobuccal(MB)and distobuccal(DB)roots of the left maxillary first molar respectively.In both of the two coronal slices,the buccal bone thickness was measured at 13(HB13),15(HB15),17(HB17)mm above the HB plane at a gingival inclination of 60°.The measurement differences of bone thickness between MB and DB,and among different heights were evaluated,and the differences among S1,S2,and S3 groups in each simulated paths were compared.Distributions of measurements were reported as colormaps.Results The IZC bone thickness of DB was thicker than MB at HB13 and HB15 in the 3 groups.The higher the insertion height,the smaller the bone thickness(P<0.05).Bone thickness decreased from S1 to S2 to S3 at HB13 and HB15.The maximum bone thickness(5.20 mm)was observed at HB13 in DB,and the minimum bone thicness(1.90 mm)was observed at HB17 in DB.Conclusion The thickest bone in IZC of the three groups located at HB13 in DB of the maxillary first molar,and the bone thickness decreases with the increase of the insertion height.The later the eruption stage of the maxillary second molar,the less bone thickness in the IZC region and the operation difficulty might increase.

关 键 词：锥形束CT 颧牙槽嵴区(IZC) 上颌第二磨牙 萌出阶段 骨厚度 

分 类 号：R783.5[医药卫生—口腔医学]