Tipos esqueletais da má oclusão de classe III dos pacientes adultos da clinica de ortodontia da FO/UFMG

Abstract

The class III malocclusion represents a small percentage in the total of malocclusions, however it presents a very complex aetiology and its skeletal type changes according to race and ethnicity. The class III diagnosis and treatment remains a challenge for orthodontics, mainly due to multiple etiological factors involved. Its resulting success or failure are also related to the individuals growth potential, which unfortunately is unstable and unknown. The aim of this study was to investigate the different skeletal types of class III malocclusion in adult patients at the Orthodontics Clinical of FO/UFMG. MATERIAL AND METHODS: This is a study of files of the FO / UFMG Orthodontics Clinical (from 2003 to June 2013). The sampling universe was obtained from 120 adult patients of at least 18 years of age and with initial lateral cephalometric radiograph. From the initial radiographs, the same operator performed cephalometric tracings. RESULTS: The results showed 15 patients with skeletal class III, whereas three of them (20%) had maxillary micrognathia and one (6.5%) had maxilla with retrognathism and micrognathia. One individual (6.5%) had mandibular prognathism and macrognathia and ten individuals (67%) had combination of maxillary micrognathia and mandibular prognathism. CONCLUSION: The adult patients from the Orthodontics Clinical of FO/UFMG who presented malocclusion class III skeletal origin had mainly a combination of maxillary micrognathia and mandibular prognathism. The different skeletal types found in this study can assist studies, besides serving as sample for future genetic study.