Deen Emily, Woods Michael G
Aust Orthod J. 2015 May;31(1):59-68.
The present study involved an assessment of the effects of the Herbst appliance used for Class II correction in subjects with different vertical facial patterns.
Pre- and post-treatment lateral cephalograms of 91 growing Class II patients were divided into three vertical facial groups on the basis of mandibular plane angulation. All received a Herbst appliance and dental and skeletal changes were assessed in relation to pretreatment incisal overbite, overjet and the stage of cervical maturity.
Herbst appliance treatment was accompanied by changes in the angulation of the upper and lower incisors, overjet reduction and an increase in mandibular length. In general, the rotational facial changes occurring during treatment were minimal, so that dolichofacial patterns remained long and brachyfacial patterns remained short.
Herbst appliance treatment can be expected to result in considerable Class II dental correction. It is unlikely, however, that its use will be associated with clinically significant forward rotation in dolichofacial subjects. Since dolichofacial patterns are likely to remain long-faced, even after considerable Class II dental correction, orthognathic surgery may still be a consideration if normal facial proportions, without excessive facial convexity and lip strain, are treatment aims.
本研究旨在评估Herbst矫治器对不同垂直面型的II类错颌患者进行矫治的效果。
根据下颌平面角，将91例生长发育期的II类错颌患者治疗前、后的头颅侧位片分为三个垂直面型组。所有患者均佩戴Herbst矫治器，并根据治疗前的切牙覆合、覆盖以及颈椎成熟度阶段评估牙齿和骨骼的变化。
Herbst矫治器治疗伴随着上下切牙角度的改变、覆盖减小以及下颌长度增加。总体而言，治疗过程中面部旋转变化极小，因此长面型患者仍保持长脸，短面型患者仍保持短脸。
Herbst矫治器治疗有望实现显著的II类错颌牙齿矫治。然而，对于长面型患者，使用该矫治器不太可能导致临床上显著的向前旋转。由于即使在进行大量II类错颌牙齿矫治后，长面型患者可能仍保持长脸，如果治疗目标是获得正常面部比例、无过度面部凸度和唇部紧张，则正颌手术可能仍是一个考虑因素。
