Naini Farhad B, Cobourne Martyn T, McDonald Fraser, Wertheim David
Kingston and St George's Hospitals and Medical School, Blackshaw Road, London, SW17 0QT UK.
King's College London Dental Institute, London, UK.
J Maxillofac Oral Surg. 2016 Dec;15(4):469-477. doi: 10.1007/s12663-015-0872-4. Epub 2015 Dec 11.
The submental-cervical angle may alter as a result of mandibular orthognathic surgery and/or the ageing process and is therefore an important facial aesthetic parameter for comparative diagnosis and treatment planning. The purpose of this study was to undertake a quantitative evaluation of the influence of the submental-cervical angle on perceived attractiveness and threshold values of desire for surgery.
The submental-cervical angle of an idealized profile silhouette image was altered incrementally between 90° and 130°. The images were rated on a seven-point Likert scale by pre-treatment orthognathic patients (n = 75), laypeople (n = 75), and clinicians (n = 35).
A submental-cervical angle of 90°-105° was deemed acceptable. Angles up to 120° were deemed slightly unattractive by the lay and clinician groups, but very unattractive by the patient group. By 125°-130° all groups perceived the angle as very unattractive. The threshold value of desire for surgery was 110° for patients, 115° for lay people and 125° for clinicians. Patients appear to be more critical than lay and clinician groups.
These ranges of normal variability of the submental-cervical angle and threshold values of desire for surgery, in terms of observer acceptance, should be considered by clinicians in planning mandibular orthognathic surgery and aesthetic surgical procedures of the submental-cervical region.
颏颈角可能会因下颌正颌手术和/或衰老过程而改变，因此是用于对比诊断和治疗规划的重要面部美学参数。本研究的目的是对颏颈角对感知吸引力和手术期望阈值的影响进行定量评估。
将理想化侧面轮廓图像的颏颈角在90°至130°之间逐步改变。由正颌手术治疗前的患者（n = 75）、普通人群（n = 75）和临床医生（n = 35）根据七点李克特量表对图像进行评分。
90°至105°的颏颈角被认为是可接受的。普通人群组和临床医生组认为120°及以下的角度略有不美观，但患者组认为非常不美观。到125°至130°时，所有组都认为该角度非常不美观。患者的手术期望阈值为110°，普通人群为115°，临床医生为125°。患者似乎比普通人群组和临床医生组更挑剔。
临床医生在规划下颌正颌手术和颏颈区域的美容手术时，应考虑这些颏颈角正常变异范围以及根据观察者接受程度得出的手术期望阈值。
