Jansen Jesper, Dubois Leander, Schreurs Ruud, Gooris Peter J J, Maal Thomas J J, Beenen Ludo F, Becking Alfred G
PhD Student, Department of Oral and Maxillofacial Surgery, Orbital Unit and 3D Lab, Academic Medical Centre of Amsterdam, Academic Centre for Dentistry Amsterdam, University of Amsterdam, Amsterdam, The Netherlands.
Staff Member, Department of Oral and Maxillofacial Surgery, Orbital Unit and 3D Lab, Academic Medical Centre of Amsterdam, Academic Centre for Dentistry Amsterdam, University of Amsterdam, Amsterdam, The Netherlands.
J Oral Maxillofac Surg. 2018 Feb;76(2):380-387. doi: 10.1016/j.joms.2017.09.018. Epub 2017 Oct 9.
Mirroring has been used as a diagnostic tool in orbital wall fractures for many years, but limited research is available proving the assumed symmetry of orbits. The purpose of this study was to evaluate volume and contour differences between orbital cavities in healthy humans.
In this cross-sectional study, the left and right orbital cavities of a consecutive sample of patients' computed tomograms were measured. Inclusion criteria were patients with no sign of orbital or sinus pathology or fracture. Outcome variables were differences in volume and contour. Descriptive statistics and Student paired t test were used for data analysis of orbital volume and distance maps were used for analysis of orbital contour.
The sample was composed of 100 patients with a mean age of 57; 50% were men. The total mean orbital volume was 27.53 ± 3.11 mL. Mean difference between cavities was 0.44 ± 0.31 mL or 1.59% (standard deviation [SD], 1.10%). The orbital contour showed high similarity, with an absolute mean left-versus-right difference of 0.82 mm (SD, 0.23 mm).
The authors hypothesize that the measured differences between right and left orbital volumes and contours are clinically minor. In consequence, the use of mirroring tools as part of preoperative planning in orbital reconstruction is legitimate with the aim of simulating the pre-traumatized anatomy.
多年来，镜像技术一直被用作眼眶壁骨折的诊断工具，但证明眼眶假定对称性的研究有限。本研究的目的是评估健康人眼眶腔之间的体积和轮廓差异。
在这项横断面研究中，对连续样本患者的计算机断层扫描图像的左右眼眶腔进行测量。纳入标准为无眼眶或鼻窦病变或骨折迹象的患者。结果变量为体积和轮廓的差异。描述性统计和学生配对t检验用于眼眶体积的数据分析，距离图用于眼眶轮廓的分析。
样本由100名平均年龄为57岁的患者组成；50%为男性。眼眶总体积平均为27.53±3.11mL。腔隙之间的平均差异为0.44±0.31mL或1.59%（标准差[SD]，1.10%）。眼眶轮廓显示出高度相似性，左右绝对平均差异为0.82mm（SD，0.23mm）。
作者推测，左右眼眶体积和轮廓的测量差异在临床上较小。因此，将镜像工具作为眼眶重建术前规划的一部分，以模拟受伤前的解剖结构是合理的。
