Maksiller Protraksiyon Amacıyla Kullanılan İki Farklı Sistemin Sonlu Elemanlar Analizi ile İncelenmesi

Abstract

The aim of our study was to predict the differences in the two different skeletal anchoring methods used in the treatment of class III malocclusions with maxillary retrognathia by using finite elements analyssis. For this purpose, two different cranial models were constructed by using the finite element analysis. In the first model, a hybrid-hyrax appliance, which extends from the palatinal region through the miniscrews supporting with maxillary molar bands simulated and the protraction force was applied below the occlusal plane with 30 degree through the maxillary first molar and the Von Misses stress, maximum principal stress, minimum principal stress and displacement values were obtained. In the second model, infrazygomatic skeletal anchored miniplates were simulated and the protraction force was applied to pass the lower end of the miniplates passing through the first molar line at a distance of 30 degrees below the occlusal plane, and Von Misses stress, maximum principal stress, minimum principal stress and displacement values were obtained.Von Misses stress, maximum principal stress, minimum principal stress and displacement values in both models were evaluated comparatively. As a result of our study, the maximum principal stress values were obtained in a manner to stimulate the anterior growth of the maxillaries in both models. Similarly, in both models, it was observed that in the frontomaxilary and frontonasal sutures under the maxillary protraction force, tensile forces in the form of pressure were seen while maxilla moves anteriorly, but this anterior rotation effect was less frequent in the miniplate model when the maximum and minimum principal stress values were considered. In hybrid hyrax model, it was observed that dental structures also had an effect compared to the miniplate model.