A Study On The Dentoskeletal Changes With Cervical Pull

Objectives:Although a cervical pull headgear is applied generally in growing Class II patients, there are much controversies about restriction of maxillary growth, increase of mandibular plane angle, and changes of palatal plane and occlusal plane, extrusion of maxillary first molar. The purpose of this study is to investigate the effect of cervical pull headgear compare to high pull headgear . Methods:1. Cephalometric Comparisions before and after cervical pull headgear application, 2. Cephalometric comparision before and after high pull headgear application, Results:The finding of this study can be summarized as follows. 1. Maxillary protrusion was decreased, However it was not due to maxillary growth restriction but downward tipping of palatal plane. 2. Mandibular forward growth through maxillary expansion was observed, but it was not significant. 3. Palatal plane was tipped downward, but its inclination was not significantly different in high pull headgear group. 4. Mandibular plane angle was not increased through compensating condylar growth. 5. Total facial height and posterior facial height was increased, but facial height ratio showed no significant difference before and after treatment 6. Occlusal plane angle was decreased. 7. Maxillary first molar moved distally and extruded, and it showed significant changes. Conclusions:This study elucidated that the cervical pull headgear was effective in maxillary growth control without increase of mandibular plane angle. Therefore it is considered that cervical pull headgear can be applied effectively in class II malocclusion