Abstract
Aim: To evaluate the differential diagnosis of Angle Class III malocclusion in adolescents of Mosulcity. Materials and Methods: A sample of 170 Iraqi subjects aged 12–15 years, 85 subjects with ClassIII malocclusion (42 males and 43 females) were selected on the basis of molar and incisorrelationships. Eighty fife subjects with Class I normal occlusion (42 males and 43 females) werechosen. Lateral cephalometric radiographs were taken for each subject and thirty six measurementswere determined (20 angular, 14 linear and 2 ratios). Results: There were 7 subgroups in Class IIImalocclusion. Pure maxillary retrognathism was the most common subgroup, which represented31.8%; whereas pure mandibular prognathism was the second subgroup with 23.5%. When the loweranterior facial height (LAFH) was considered with both maxillary and mandibular position, 14subgroups were found. The most common subgroup included subjects with retrognathic maxilla,normal mandible and normal (LAFH) with 16.5% of total sample. The second subgroup includedsubjects with retrognathic maxilla, normal mandible and increased (LAFH) with 15.3%. The thirdsubgroup included subjects with normal maxilla, prognathic mandible and normal (LAFH) whichrepresented 10.6%. Conclusion: the maxillary retrognathism is more common than mandibularprognathism in Mosul City
