颧弓解剖形态数字化测量的分析

Digital measurement of anatomical morphology of a zygomatic arch

目的:对正常突度颧骨颧弓人群和高突颧骨颧弓人群的颧弓骨解剖形态进行测量分析,为高颧骨颧弓降低术的改良提供依据。方法:2018年1月至2020年2月,收集天津市口腔医院就诊人群45例[男15例、女30例,年龄18~44(25.1±4.8)岁]CT资料,其中正常突度颧骨颧弓人群30例(A组)、高突颧骨颧弓人群15例(B组)。将CT数据以DICOM格式导入建模分析软件mimics 23.0,通过标准步骤获得左右侧颧骨颧弓体三维骨模型90例。对三维骨模型截骨分析,通过骨段数据测量结合形态观察获取颧弓解剖形态特征。对截骨位置数据用95%置信区间估计、对两组解剖形态数据进行独立样本t检验。结果:30例高颧骨弓样本中稳定区前缘位置位于关节结节点之前(15.49 mm,17.03 mm),稳定区后缘位置(膨大区前缘位置)位于关节结节点前(7.11 mm,8.24 mm),膨大区后缘位置位于关节结节点之前(3.17 mm,3.94 mm)。A组与B组相比,稳定区后缘位置项(t=2.41,P=0.018)、膨大区后缘位置项(t=2.58,P=0.012)、单侧面宽项(P<0.01)差异均有统计学意义。结论:颧弓骨上有一段骨形态稳定区及后方骨膨大区,正常突度颧骨颧弓人群与高突颧骨颧弓人群在单侧面宽及颧弓骨膨大区位置项上有差异。

Objective To analyze the anatomical morphology of the zygomatic arch for reduction malarplasty.Methods Computed tomography(CT)data were obtained from the electronic records of 45 patients in the Tianjin Stomatological Hospital from January 2018 to February 2020.Among them,there were 30 patients with normal protrusion of zygoma(group A)and 15 patients with prominent protrusion of zygoma(group B).The data were imported into modeling and analysis software(Mimics).Left and right three-dimensional(3D)zygoma models were created through standard procedures.In the 3D models,a vertical cut of the zygomatic arch was done,and anatomical morphological characteristics of the zygomatic arch were obtained through bone data measurement and morphological observation.Mean values with 95%confidence intervals(CI)were calculated for the positional data.Independent sample T-test was conducted on the positional data and anatomical morphology data of the zygomatic arch in the two groups.P<0.05 was considered as statistically significant.Results In group B,the anterior edge of the stabilization area was located in front of the articular tubercle point(15.12 mm,17.16 mm).The posterior edge of the stabilization area was located in front of the articular tubercle point(7.11 mm,8.24 mm).The posterior edge of the enlarged area was located in front of the articular tubercle point(3.17 mm,3.94 mm).There were significant differences between group A and group B in the posterior edge of the stabilization area(t=2.41,P=0.018),the posterior edge of the enlarged area(t=2.58,P=0.012),and the width of the unilateral face(P<0.01).Conclusions There exists a stabilization area of bone morphology and enlargement area in zygomatic arch.The anatomical morphology of the zygomatic arch is different in width of the unilateral face and location of the enlarged area between populations with normal protrusion and prominent protrusion of the zygoma.