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

Tooth formation is widely used to assess maturity and to predict age. Within clinical dentistry, such information aids in diagnosis and treatment planning. Numerous methods exist that allow either the prediction of age or an assessment of maturation. One widely used method was first described in 1973 by demirjian et al., based on a large number of french-canadian children. Many changes and adaptations and even software formulations have been made to the original demirjian method due to differences found in the populations where the classical method had been tested. The purpose of this study was to evaluate applicability of demirjian's method for dental age estimation in / Egyptian children. Agin 6-8 years (a part of larger study including 1400 Egyptian child). The panoramic radiographs were selected to be equally divided equally into 100 boys and 100 girls in 4 groups with 6 months interval. Panoramic radiographs of 200 he-althy, Egyptian. Children, 6-8 years of age were examind with demirjians,s method using the soft ware Onyx ceph 3d panoramic radiographs were examined and have stages from A-H according to demirjian staging system and then every stage was converted into a score and the sum of the maturity scores was converted into an estimated dental age. Dental age was compared to chronological age by using a paired T-test. The mean age for individualteeth for each stage was calculated. The A Egyptian children were generally delayed in dental maturity compared with the children in Demirjian's sample. The overall overestimation of the dental age in boys was ranging from 0.57y to 0.1 l y with a mean

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