背景:牙面畸形是一种常见的疾病,会影响很大一部分人群,导致功能和美学缺陷。正颌手术,比如LeFortI截骨术,是为了纠正这些异常。然而,这些手术对鼻轮廓变化的影响尚不清楚.此外,前鼻脊柱(ANS)复位在3-5mm范围的上颌前移手术中的作用尚待确定。这项研究旨在研究在III类骨骼患者中,LeFortI截骨术上颌前移范围为3-5mm后,ANS复位对软组织轮廓变化的影响。假设是,在接受LeFortI截骨术并有和没有ANS复位的患者之间,鼻唇沟角度和上唇长度的变化不会有显着差异。
方法:本研究设计为随机对照试验。将从德黑兰的Bu-Ali和Farahikhtegan医院的颌面诊所招募26名患有颌面部异常的III类骨骼患者,伊朗。符合纳入标准的患者将被随机分为两组:一组将接受LeFortI截骨术并减少ANS,另一组将在不减少ANS的情况下进行LeFortI截骨术。软组织改变了,特别是鼻唇沟角度和上唇长度,对两组进行评价和比较。
结论:通过正颌手术实现面部和谐需要仔细计划和考虑对周围软组织的影响。主要目标是预测和计划对鼻唇区域的影响。LeFortI截骨术是一种用于矫正牙面畸形的常见手术,特别是在III类患者中。在此手术中上颌前移会导致鼻尖位置的变化,宽度,和旋转,可能是由于前鼻棘和软组织解剖的重新定位。在这项研究中,使用头颅X光片评估非生长的III类患者的软组织变化。对于3-5mm的上颌前移,将研究减少鼻前脊柱(ANS)对鼻轮廓变化的影响。将评估客观测量和患者报告的结果,以了解正颌手术的美学结果。这些发现将为基于预期的鼻轮廓变化的治疗决策和替代方案提供有价值的指导。
背景:该项目已在伊朗临床试验注册中心注册(标识符编号:IRCT20210928052625N1,网站:https://www.irct.ir/trial/59171)和开放科学框架(OSF)(注册https://doi.org/10.17605/OSF。IO/X3HD4)。2021-06-09。
BACKGROUND: Dentofacial malformation is a common condition that affects a significant portion of the population, resulting in functional and aesthetic defects. Orthognathic surgeries, such as LeFort I osteotomy, are performed to correct these abnormalities. However, the impact of these surgeries on nasal profile changes remains unclear. Additionally, the role of anterior nasal spine (ANS) reduction in maxillary advancement surgeries of 3-5 mm range is yet to be determined. This
study aims to investigate the effect of ANS reduction on soft tissue profile changes following LeFort I osteotomy with a maxillary advancement range of 3-5 mm in class III skeletal patients. The hypothesis is that the changes in nasolabial angle and upper lip length will not significantly differ between patients who undergo LeFort I osteotomy with and without ANS reduction.
METHODS: This
study is designed as a randomized controlled
trial. A total of 26 class III skeletal patients with maxillofacial abnormalities will be recruited from the maxillofacial clinic of Bu-Ali and Farahikhtegan Hospitals in Tehran, Iran. Patients meeting the inclusion criteria will be randomly assigned to two groups: one group will undergo LeFort I osteotomy with ANS reduction, and the other group will undergo LeFort I osteotomy without ANS reduction. The soft tissue profile changes, specifically the nasolabial angle and upper lip length, will be evaluated and compared between the two groups.
CONCLUSIONS: Achieving facial harmony through orthognathic surgery requires careful planning and consideration of the impact on surrounding soft tissue. The primary objective is to predict and plan for the effects on the nasolabial region. LeFort I osteotomy is a common procedure used to correct dentofacial deformities, particularly in class III patients. Maxillary advancement during this surgery can lead to changes in nasal tip position, width, and rotation, potentially due to repositioning of the anterior nasal spine and soft tissue dissection. In this
study, soft tissue changes will be assessed in non-growing class III patients using cephalometric radiographs. The impact of reducing the anterior nasal spine (ANS) on nasal profile changes will be investigated for maxillary advancements of 3-5 mm. Objective measurements and patient-reported outcomes will be evaluated to gain insights into the aesthetic outcomes of orthognathic surgery. The findings will provide valuable guidance for treatment decisions and alternative options based on expected nasal profile changes.
BACKGROUND: This project was registered at The Iranian Registry of Clinical Trials (Identifier No. IRCT20210928052625N1, Website: https://www.irct.ir/
trial/59171 ) and Open Science Framework (OSF) (Registration https://doi.org/10.17605/OSF.IO/X3HD4 ). 2021-06-09.