Sidhu M S, Kharbanda O P, Sidhu S S
Department of Dental Surgery, All India Institute of Medical Sciences, New Delhi.
Br J Orthod. 1995 Feb;22(1):1-12. doi: 10.1179/bjo.22.1.1.
This study investigated treatment changes produced by the Herbst appliance in a sample of severe Class II division 1 cases, over a period of 8 months. The sample consisted of 16 girls, of whom eight were treated by the Herbst appliance, whilst eight served as controls. All cases were matched with respect to age, sex, skeletofacial morphology, and length of treatment/observation period. Twenty-two skeletal and 19 dental parameters were recorded on pre- and post-treatment cephalograms. The net treatment effect of Herbst therapy was evaluated, taking into account the growth that occurred in the control sample. The study revealed that during 8 months of Herbst therapy there was a significant increase in mandibular length, along with sagittal repositioning. The skeletal changes in the mandible were mainly responsible for overjet and molar relation correction. A slight, favourable forward rotation of the mandible was identified. Dentoalveolar features included flaring of lower incisors and distalization of upper molars. The appliance did not have any retrusive effect on the maxilla. The modified splint design differed from the original and was cemented rather than bonded.
本研究调查了Herbst矫治器在8个月期间对一组严重安氏II类1分类病例样本所产生的治疗变化。样本包括16名女孩，其中8名接受Herbst矫治器治疗，另外8名作为对照。所有病例在年龄、性别、骨骼面部形态以及治疗/观察期时长方面进行了匹配。在治疗前和治疗后的头颅侧位片上记录了22项骨骼参数和19项牙齿参数。考虑到对照样本中发生的生长情况，对Herbst治疗的净治疗效果进行了评估。研究表明，在8个月的Herbst治疗期间，下颌长度显著增加，同时伴有矢状向重新定位。下颌骨的骨骼变化是覆盖和磨牙关系矫正的主要原因。发现下颌骨有轻微的、有利的向前旋转。牙牙槽特征包括下切牙唇倾和上磨牙远中移动。该矫治器对上颌骨没有任何后缩作用。改良后的夹板设计与原设计不同，采用了粘结而非粘接的方式。
