Effect of the vertical holding appliance combined with PASS correction technique on the change of jaw plane angle and chin morphology in children with maxillary protrusion

ObjectiveTo investigate the effects of vertical holding appliance(VHA) combined with physiological anchorage spee's wire system correction technique on the change of jaw plane angle and chin morphology in children with maxillary protrusion.

MethodsSeventy-six children with maxillary protrusion were divided into the VHA group and non-VHA group according to the random number table method.Two groups were treated with PASS correction, and the VAH group was additionally treated with vertical holding appliance.

ResultsThe VHA anchorage significantly improved the lip protuberance of the upper central incisor(P < 0.01).The holding appliance combined with VHA had better control on the vertical growth of teeth after orthodontic treatment(P < 0.05 to P < 0.01), could make the patient's mandible rotate from the front to the top counter clockwise to make mandible rotate forward, and the difference of which between before and after treatment was statistically signfiicant(P < 0.05 to P < 0.01).

ConclusionsFor the treatment of pediatric maxillary protrusion, especially for the more difficult cases of correction, and it is often necessary to use a variety of treatment measures to strengthen the anchorage.It is particularly important to have a simple and efficient way to enhance the anchorage(such as vertical holding appliance), which can improve the therapeutic effect, and make the patients satisfied.