Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Orthodontics

The present study was undertaken to assess the prevalence of malocclusion and orthodontic treatment need using the Index of Orthodontic Treatment Need in a group of Egyptian school children in Portsaid and Domyat governorates. This study was a part of a research project between the Ministry of Education, Ministry of Health and the Orthodontic department representing the Faculty of Oral and Dental Medicine, Cairo University which included seven separate studies in different Egyptian governorates. Portsaid governorate was divided into seven regions while Domyat governorate was divided into four regions according to geographical location, one school was chosen randomly from each region thus, seven schools from Portsaid governorate and four schools from Domyat governorate were included in the study. A total of 1300 students (52.9% males and 47.1% females) from Portsaid and 300 students (47% male and 53% female) from Domyat, aged 8 to 12 years who had not undergone orthodontic treatment were randomly selected , from public schools in both governorates .The randomly-chosen students were school children of both genders born to Egyptian parents and those who did not meet the inclusion criteria were excluded from the sample. A letter was sent to the parents of all students to seek consent for their cooperation in the study. Clinical examination was performed with the cooperation of the health care specialist where each student was seated on an ordinary chair with the head in an upright position and was instructed to occlude on his posterior teeth to assess anteroposterior, vertical and transverse dental relations including molar relation , overjet, overbite and crossbite. Each child was then asked to open his/her mouth for intra-arch dental assessment including displacement, missed teeth, supernumerary teeth, submerged (ankylosed) teeth, impeded eruption of teeth and cleft of lib and/or palate. Intaoral frontal photograph was taken for each child on centric occlusion for assessment of aesthetic component ( AC ) of IOTN .The ( AC ) and ( DHC) grade was evaluated and recorded for each child to assess the index of orthodontic treatment need in both governorates

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