Thesis (M.Sc.) - Cairo University - Faculty of Oral and dental medicine - Department of Orthodontics

This project was aimed to determine the prevalence of malocclusion among school children in Giza governorates. MATERIALS AND METHODS: This study was carried out in Giza governorate where a list of the primary schools and the number of primary school children in Giza governorate were obtained from the database of the Ministry of Education. Giza governorate was divided into ten regions according to geographical location, two and sometimes three schools were chosen randomly from each region using SAS computer software thus, 20 schools were included in this study and a total number of 1900 schoolchildren were included in this survey. Results: Distribution of Angle classification: this study showed that 392 children (20.6%) had accepted occlusion while, 1029children had Angle Class I malocclusion representing (54.2%) of the study sample, 300 children had Angle Class II malocclusion representing (15.8%) of the study sample while 163 children had Class III malocclusion representing (8.6%) of the study sample and 16children had Class IV representing (0.8 %) of the study sample. Overjet: The most frequent category was normal overjet (>0{u2013}3.5mm) which was found to be (60.5%). Anterior open bite (<0 mm) was found in (6.9%) of the total sample. Conclusion: Compared to previous Egyptian studies, there was a tendency toward decrease in the prevalence of accepted occlusion while, there was an increase in Angle Class II and III malocclusion

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