نبذة مختصرة : Objective: To evaluate cephalometric stability in the sagittal and vertical planes of class III malocclusion patients undergoing bimaxillary orthognathic surgery Class III skeletal malocclusion is reported as the most frequently dentofacial alteration treated in combination with orthodontics and orthognathic surgery. It is important to evaluate the stability or relapse of the surgical treatment performed on these patients. Methods: A longitudinal study were conducted in 20 patients (11 women), with an average of 22.5 years old, diagnosis of hypoplasia of the facial middle third and mandibular prognathism, treated with orthodontics and bimaxillary orthognathic surgery. Three lateral cephalic radiographs were taken for each patient: one prior to the surgical procedure (T1), another at 8 post-surgical months (T2) and finally at 18 post-surgical months (T3). The changes on the X and Y planes were evaluated the same three times, performing the relevant statistical tests in order to observe differences. Results: More stable measurements were found in the upper jaw in the vertical and sagittal direction, while the mandible is less stable to surgical movements, mainly in the vertical direction (statistically significant differences p<0.05). Conclusion: bimaxillary orthognathic surgery in class III malocclusion is very stable (especially in the maxilla). It is important to keep in mind the maxillary biomechanics in order to offer an accurate treatment to these patients. Further studies are required in order to investigate possible associated predictor factors. ; Objetivo: evaluar, a través de medidas cefalométricas de los planos sagital y vertical, la estabilidad de pacientes con maloclusión clase III sometidos a cirugía ortognática bimaxilar. Métodos: se aplicó estudio longitudinal en 20 pacientes (11 mujeres), en un promedio de edad de 22.5 años y con diagnóstico de hipoplasia del tercio medio facial y prognatismo mandibular, tratados con ortodoncia y cirugía ortognática bimaxilar. Se realizaron tres radiografías ...
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