Abstract：
the aim of this paper, is to propose a new reference line: the Frontozygomatic-Infraorbital Line (FZ-IOL). This reference line can guide the surgical team planning mandibular angle harmonization, based on the patient\'s skeletal proportion. The Frontozygomatic-Infraorbital Line has been adopted for symmetrization surgery, masculinization surgery, and in unsatisfactory results of previous orthognathic surgery. From March 2021 to December 2022, 3 patients were treated for severe facial asymmetry affecting mainly the lower third of the face. All cases were planned with the reference FZ-IOL. Patients were treated in the same center, at the Orthognathic Surgery Department of the Instituto Portugues da Face, Lisbon, Portugal. The Frontozygomatic-Infraorbital Line is designed virtually using software to reconstruct a 3D image from a digital imaging and communications in medicine (DICOM) file obtained from a cone beam computer tomography (CBCT). , connecting the two orbital rims. Then, a vertical line, the frontozygomatic line perpendicular to the IOL and passing through the outmost lateral portion of the frontozygomatic suture is drawn. The proposed line demonstrated how establishing appropriate reference lines is crucial for the success of the surgery. The selection of reference lines should be based on the patient\'s anatomy, the symmetrization process\'s complexity, and the surgery\'s desired outcome. The Frontozygomatic-Infraorbital Line represents an adequate reference line for managing mandibular angle lateral projection, improving lower third of the face symmetrization.
摘要：
本文的研究目的,提出了一条新的参考线：前zu线-眶下线（FZ-IOL）。该参考线可以指导手术团队规划下颌角的协调，根据病人的骨骼比例。额骨-眶下线已用于对称化手术，男性化手术,和以前的正颌手术效果不理想。从2021年3月到2022年12月，3名患者接受了严重的面部不对称治疗，主要影响面部的下三分之一。所有病例均采用参考FZ-IOL计划。患者在同一中心接受治疗，在PortuguesdaFace研究所的正颌外科，里斯本,葡萄牙。Frontozygoma-Infraoral线的设计实际上是使用软件从锥形束计算机断层摄影（CBCT）获得的数字成像和医学通信（DICOM）文件重建3D图像。,连接两个轨道边缘。然后，垂直线,绘制垂直于IOL并穿过额骨缝合线的最外侧部分的额骨线。提议的线展示了如何建立适当的参考线对于手术的成功至关重要。参考线的选择应基于患者的解剖结构，对称化过程的复杂性，和手术的预期结果。额骨-眶下线代表了管理下颌角侧向投影的适当参考线，改善下三分之一的面部对称。
