Posttreatment Maxillomandibular changes in male with treated Class II division 1 malocclusion and normal occlusion: a comparative evaluation

Júlio de Araújo GURGEL, Renato Rodrigues de ALMEIDA, Arnaldo PINZAN

The purpose of this investigation was to determine the effects of orthodontic treatment on individuals with Class II, division 1 malocclusion, at the end and 2-year post treatment. Lateral cephalograms were available for 44 males at the age range of 12 years and 10 months to 18 years and 10 months. From the broad sample, 19 individuals completed the experimental group and were treated with conventional edgewise-orthodontic appliances and four first premolar extractions. This Class II group was compared to 25 normal individuals matched for age and Sex. Pretreatment, post-treatment and 3 years post-treatment cephalograms of each one individual were superimposed by means of Björk structural method, which permitted the transference of horizontal –X and vertical –Y Cartesian coordinates. The variables were analyzed with the two way analysis of variace and with the Tukey-Kramer test. Results demonstrated that the difference between the two groups, in the pre-treatment phase, consisted of the mandibular distal positioning of the Class II, division 1 malocclusion. At the posttreatment period, there was a discrete skeletal effect, primarily in the maxilla. At the 3 years post-treatment there was skeletal growth increments, although smaller than previously. Dispite smaller, the control group presented significant larger vertical displacements of the apical bases than the experimental group. Nevertheless lower than in anterior phase.

Keywords: Class II, division 1 malocclusion. Cephalometrics. Orthodontics.

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