Prospective study of dentoskeletal changes in Class II division malocclusion treatment with twin force bite corrector.
OBJECTIVE
To evaluate the dentoskeletal changes of Class II malocclusion treatment with the Twin Force Bite Corrector (TFBC).


METHODS
The sample comprised 86 lateral cephalograms obtained from 43 subjects with Class II division 1 malocclusion; the subjects were divided into two groups. The experimental group comprised 23 patients with a mean initial age of 12.11 years who were treated with the TFBC for a mean period of 2.19 years. The control group included 40 lateral cephalograms from 20 Class II nontreated patients, with an initial mean age of 12.55 years and a mean observation period of 2.19 years. The lateral cephalograms were evaluated before and after orthodontic treatment in group 1 and in the beginning and end of the observation period in group 2. t-Tests were used to compare the initial and final cephalometric characteristics of the groups as well as the amount of change.


RESULTS
The experimental group presented greater maxillary growth restriction and mandibular retrusion than the control group, as well as greater maxillomandibular relationship improvement and greater labial tipping of the mandibular incisors. The results also showed a greater decrease in overbite and overjet in the experimental group, and there were no statistically significant differences in the craniofacial growth pattern between groups.


CONCLUSIONS
The TFBC promotes restriction of anterior maxillary displacement without significant changes in mandibular length and position and improvement of maxillomandibular relationship without changes in facial growth and significant buccal tipping of mandibular incisors. Class II correction with the TFBC occurred primarily as a result of dentoalveolar changes.
Orthodontic Graduate Student, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil. carloshenrique@ortodontista.com.br
Carlos Henrique
CH
Guimarães
José Fernando Castanha
JF
Henriques
Guilherme
G
Janson
Marcio Rodrigues
MR
de Almeida
Janine
J
Araki
Rodrigo Hermont
RH
Cançado
Renata
R
Castro
Ravindra
R
Nanda
D000293:Adolescent; D002508:Cephalometry; D002648:Child; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008445:Maxillofacial Development; D016382:Orthodontic Appliance Design; D017289:Orthodontic Appliances, Functional; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D016896:Treatment Outcome