Cephalometric evaluation on the influence of the surgical-orthodontic treatment on the resulting advancement in class II individuals with mandibular deficiency / Avaliação cefalometrica da influencia do tratamento ortodontico-cirurgico na quantidade de avanço mandibular em individuos classe II com deficiencia mandibular

Eloisa Marcantonio Boeck

The treatment to Class 11 adult individuals with mandibular deficiency has been the orthodontic treatment combined with orthognatic surgery. Therefore, a study was conducted to evaluate, through cephalometric analysis, the influence of dentoalveolar decompensation in class 11 patients submitted to orthodontic and surgical treatment for mandibular advancement, by bilateral osteotomy of the mandibular ramus. A sample of fifteen leucoderm adult female patients female were selected for the study. Three cephalometric radiographs of each patient, taken previously to the orthodontic treatment (tI), previously to surgery (t2) and after at least 6 months postoperatively (t3), were analyzed in a total of 45 roentgenograms. The tracings were made through the manual method and the points were digitalized using the software Dentofacial Planner Plus (2.02). The results showed that values of SNB increased from 75,6° to 78,6°. The measures of BNP e PGNP reduceded from -12,7mm to -7,7mm and -12,7mm to -6,6mm, respectively. For the ANB angle a redution of 3,23° was observed from 8,1° to 4,9°. Likewise, there was diminution in values of AOBO in 6,3mm, with variation from 7,6mm to 1,3mm and, the values of OJ had greater reduction (5,7mm), changed from 9,Omm to 3,3mm. It has been concluded that the pre surgical orthodontic treatment promoted minimal and variable dental and skeletal changes in the final result. The surgical treatment caused significant skeletal changes especially in the measurements related to the mandible (SNB, BNP, PGNP and SNPM) or indirect1y to it (ANB, AOBO and OJ)

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