[The orthopedic treatment of skeletal class III malocclusion with maxillary protraction therapy]

Abstract

Objective: The aim of this study was to investigate the changes of skeletal anterior crossbite in early-stage after maxillary expansion and protraction therapy.

Methods: 40 chinese children with skeletal anterior crossbite were divided into two groups: the control group received no orthodontic treatment and the experimental group received maxillary expansion and protraction. The cephalometric analysis was used to evaluate the changes in both groups.

Results: In the experimental group, A point moved forward 3.5 mm (-1.75 mm in the control group). SNB, SNPg decreased and ANB, NP-PA increased. Protraction therapy to treat skeletal anterior crossbite in the middle and late stage of mixed dentition could influence craniofacial growth and development, such as accelerating forward growth of the maxilla, making mandible downward growth.

Conclusions: Protraction therapy can achieve successful result in treatment of skeletal anterior crossbite in middle and late mixed dentition.