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[Hard tissue changes in class III patients treated with maxillary protraction and rapid palatal expansion]
1Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
Objective:
To investigate the hard tissue changes of class III patients treated with maxillary protraction and rapid palatal expansion.
Methods:
Twenty-three patients were included. All patients were treated with united method. The changes of hard tissue were compared.
Results:
Hard tissue grew forward and downward in natural state. After the treatment, the significant increase of S-A, Pt-A, PNS-A was found in maxilla, and the increment of PNS-A, Pt-A was larger than that of S-A. Pg and Me dislocated backward. Wits increased by 4.5 mm.
Conclusions:
By applying maxillary protraction and rapid palatal expansion on Class III patients in the early permanent dentition, anterior displacement and increase in post-anterior dimension of maxilla were found. Mandible always rotated and slightly backward.