A Study of the Anatomic and Morphologic Changes in Class II, Division 1, Patients with Mandibular Retrognathism Treated with the Balters' Bionator, using Enlowís Counterpart Analysis

Renato BIGLIAZZI, Carlos Alberto KESSNER, Kurt FALTIN JR.

A cephalometric study using Enlow's counterpart analysis was made concerning the evaluation of the anatomic and morphologic changes of the short time treatment with the Balters' Bionator in patients with Class II, division 1 malocclusions with mandibular retrognathism. The treated sample comprised a total of 35 patients (23 female and 12 male), aged 9 on the average and under radiographic control for around 20 months. We verified which of the anatomic relationships were responsive to the treatment with Balters' Bionator and which were unaffected, and we can conclude that MCF alignment, Ramus alignment, Ramus-oclusal alignment, Ramus/MCF horizontal skeletal dimensions and Gonial angle remained unaffected during the period of treatment. A significant response to reduce the mandibular retrusion was observed in Aggregate cranial floor/maxilla and ramus/corpus horizontal dimensions at A and B points, Aggregate cranial floor/maxilla and ramus/corpus horizontal dimensions at PrS and Id points, Maxillary/Mandibular arches skeletal dimensions at A and B points, Maxillary/Mandibular arches skeletal dimensions at PrS and Id points and Curve of Spee factors. Then, we verified if differences occured in treatment response according to morphological variations present in patients at the beginning of treatment. The statistical analysis revealed that Group B patients showed less response to the treatment with the Balters' Bionator than Group A patients, and that was apparently related to the fact that these patients had formerly showed, in their morphologic characteristics, a great number of aggregate correlations to reduce the mandibular retrusion.

Keywords: Orthopedics. Balters' Bionator. Class II Treatment. Counterpart Analysis.

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