Cephalometric study of the facial profile changes in Class III patients submitted to bimaxillary orthognathic surgery

Hewerson Santos TAVARES, João Roberto GONÇALVES, Ary dos Santos PINTO, Abrão RAPOPORT

The present study evaluated the facial profile modifications in 15 skeletal Class III patients that were submitted to presurgical orthodontic treatment and orthognathic bimaxillary surgery stabilized with a rigid fixation. Eight of the patients have undergone to genioplastic surgery. Presurgical (T1) and late postsurgical (T2) radiographs taken apart with a minimum of 6 month interval had been used. The horizontal and vertical displacement of skeletal and soft tissue profile points were analyzed. The comparison of the cases submitted or not to a genioplastic surgery (t Test) showed no differences for the displacement of the skeletal and soft tissue points. The multiple linear regression analysis showed a significant correlation for horizontal movements of the Pg and Pgm points and for vertical movements of the Me and Mem points. A low correlation was found for the horizontal movements of Sena and A points and for Pn, Sn and Ph points. The vertical movements were more evident for the points Pg, Gn, and Me and for the A and Sena points but also showed low correlation.

Keywords: Skeletal Class III. Facial Profile. Orthognathic surgery.

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