Treatment effects of occipitomental anchorage appliance of maxillary protraction combined with chincup traction in children with Class III malocclusion.
OBJECTIVE
Little information related to the treatment effects of the occipitomental anchorage (OMA) appliance of maxillary (Mx) protraction combined with chincup traction is available. The aim of this study was to investigate the treatment effects of the OMA orthopedic appliance on patients with Class III malocclusion.


METHODS
Pretreatment and post-treatment cephalometric records of 20 consecutively treated patients with Class III malocclusions were evaluated and compared with a matched sample of untreated Class III control subjects.


RESULTS
The OMA appliance is effective for correcting skeletal Class III malocclusion in growing children. The treatment effects of this orthopedic appliance were considered to be from both skeletal and dentoalveolar changes. The skeletal effects were mainly obtained by stimulating forward growth of the Mx complex with negligible rotation of the Mx plane and restraining forward advancement of the mandible (Mn) with backward and downward rotation of the Mn plane. The observed dentoalveolar effects were mostly due to the labial tipping movement of the Mx incisors.


CONCLUSIONS
Our results suggest that the OMA orthopedic appliance can correct the mesial jaw relationship and negative incisal over jet. This appliance is effective for correcting skeletal Class III malocclusion with both midface deficiency and Mn prognathism in growing children.
Lin
Hsiang-Chien
HC
Department of Orthodontics, Taipei Medical University Hospital and School of Dentistry, Taipei Medical University, Taipei, Taiwan.
Chang
Hong-Po
HP
Chang
Hsin-Fu
HF
D044466:Asian People; D002508:Cephalometry / Q000379:methods; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000473:pathology / Q000628:therapy*; D008437:Maxilla / Q000473:pathology; D052280:Orthodontic Anchorage Procedures; D016382:Orthodontic Appliance Design / Q000295:instrumentation*; D016896:Treatment Outcome