关键词: Herbst矫治器, 头帽牵引, 安氏Ⅱ类错, 下颌逐步前伸

Abstract:

Objective　Skeletal and dental changes during treatment and six months post-treatment with the headgear-Herbst appliance were evaluated quantitatively.Methods　The sample comprised of 22 treated patients and 31 controls. Lateral cephalo- grams were obtained at start, after 6 months and end of active treatment, and after 6 months of retention.Results　The restraint effect on the maxilla was significant in both initial and late phases, the enhanced growth of the mandible was significant during the initial phase only, while there was effect of reduced increase in lower facial height during the late phase only. During retention pe- riod the jaw base relationshipwas maintained and the effect on the lower facial heightwas reinforced.Conclusion　The Headgear Herbst was effective orthopedic devise.

Key words: Herbst appliance, headgear, ClassⅡmalocclusion, step-by-step advancement of the mandible