Uprighting the mandibular molars stimulates mandibular growth during treatment of class II malocclusion.
We hypothesized that uprighting of the mandibular molars creates a counter-clockwise rotation of the mandible and stimulates mandibular forward growth during the treatment of a Class II malocclusion. This investigation used 33 longitudinal lateral cephalometric radiographs of Class II, Division 1 female patients. All cases were treated with non-extraction. Treatment was started in early adolescence with .018 slot edgewise Alexander appliances. High-pull head-gear and Class II elastics were used. Seventeen cases that showed more than 5 degrees of uprighting of the mandibular first molars were selected as the uprighted group. Cases that showed less than 5 degrees of uprighting of the mandibular first molars were selected as the non-uprighted group. There was a significant correlation coefficient between the uprighted degree of the mandibular first molars and the degree of clockwise rotation of the mandibular plane to FH.
Miyajima
K
K
Department of Orthodontics, School of Dentistry, Aichi-Gakuin University, Ngoya, Japan.
Yoshimoto
J
J
Murata
S
S
Kanomi
R
R
D000293:Adolescent; D002508:Cephalometry; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008312:Malocclusion, Angle Class II / Q000473:pathology / Q000628:therapy*; D008334:Mandible / Q000254:growth & development* / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology*; D009666:Nose / Q000473:pathology; D009967:Orthodontic Appliances; D012399:Rotation; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods