Dentofacial effects of bone-anchored maxillary protraction: a controlled study of consecutively treated Class III patients.
BACKGROUND
In this cephalometric investigation, we analyzed the treatment effects of bone-anchored maxillary protraction (BAMP) with miniplates in the maxilla and mandible connected by Class III elastics in patients with Class III malocclusion.


METHODS
The treated sample consisted of 21 Class III patients consecutively treated with the BAMP protocol before the pubertal growth spurt (mean age, 11.10 ± 1.8 years) and reevaluated after BAMP therapy, about 1 year later. The treated group was compared with a matched control group of 18 untreated Class III subjects. Significant differences between the treated and control groups were assessed with independent-sample t tests (P <0.05).


RESULTS
Sagittal measurements of the maxilla showed highly significant improvements during active treatment (about 4 mm more than the untreated controls), with significant protraction effects at orbitale and pterygomaxillare. Significant improvements of overjet and molar relationship were recorded, as well as in the mandibular skeletal measures at Point B and pogonion. Vertical skeletal changes and modifications in incisor inclination were negligible, except for a significant proclination of the mandibular incisors in the treated group. Significant soft-tissue changes reflected the underlying skeletal modifications.


CONCLUSIONS
Compared with growth of the untreated Class III subjects, the BAMP protocol induced an average increment on skeletal and soft-tissue advancement of maxillary structures of about 4 mm, and favorable mandibular changes exceeded 2 mm.
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA. hugo.declerck@skynet.be
Hugo
H
De Clerck
Lucia
L
Cevidanes
Tiziano
T
Baccetti
D001860:Bone Plates; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods; D002648:Child; D002680:Chin / Q000473:pathology; D005145:Face; D005147:Facial Bones / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D008046:Lip / Q000473:pathology; D008297:Male; D008313:Malocclusion, Angle Class III / Q000628:therapy*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology*; D008445:Maxillofacial Development / Q000502:physiology; D008963:Molar / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D009915:Orbit / Q000473:pathology; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation / Q000379:methods*; D011446:Prospective Studies; D013100:Sphenoid Bone / Q000473:pathology; D014716:Vertical Dimension