Comparison of 2 types of treatment of skeletal Class II malocclusions: a 5-year post-retention analysis|
de Lourdes Sá de Lira, Ana; Souza, Margareth Maria Gomes; Bolognese, Ana Maria & Nojima, Matilde
Aim: To compare 2 types of treatment for Class II malocclusion assessing mandibular behavior in
subjects submitted to full orthodontic treatment with standard edgewise appliance and cervical
headgear (Kloehn appliance) and those who used cervical headgear in the first period and with
full orthodontic appliance in the second period. Methods: The sample consisted of 80 children
treated with either cervical headgear combined with full fixed appliances (n=40, group 1), or with
cervical headgear at first (n=40, group 2). In both groups, lateral cephalometric radiographs were
compared with those made at the beginning of treatment, at its end and at 5-year post-retention
phase, in order to quantify the cephalometric measures (8 angular and 3 linear), presenting the
mandibular behavior in the antero-posterior and vertical directions. All patients were treated with
no extraction and no use of Class II intermaxillary elastics during the full orthodontic treatment.
Results: In both groups, the effective treatment of skeletal Class II malocclusion did not interfere
in the direction and amount of growth of mandibular condyles and remodeling at the lower border,
with no influence on the anti-clockwise rotation of the mandible. The mandibular growth also was
observed after the orthodontic treatment, suggesting that it is influenced by genetic factors.
Conclusions: These observations may lead to the speculation that growing patients with skeletal
Class II malocclusion and low mandibular plane are conducive to a good treatment and long-term
stability with one or two periods of treatment.
malocclusion; orthodontics; control