Clinical study of changes in dentofacial morphology in skeletal class III patients after pubertal growth by maxillary protraction

Objective To show cephalometrilally possible orthopadics of a maxillary protraction on dentofacial morphology in skeletal Class Ⅲ patients after the pubertal growth spurt period. Methods Twelve patients with anterior crossbite were treated with reverse headgear. Lateral cephalometric film taken at the beginning and the end of the treatment were analyzed. Results Overjet was over correted(3.90±0.40)mm(P0.001) with mean A point sagittal advancement of (1.80±0.37)mm(P0.05),while B point backward was (0.60±0.19)mm(P0.05).Wits was increased by(3.10±0.57)mm(P0.05),and ANB by (3.00±0.57)°(P0.05). 41% was found to be due to skeletal maxillary advancement while 59% due to tooth movement. Conclusion The maxillary protraction may be a good method to correct Angle Ⅲ malocclusion.