A study for the eruption sequence of primary and permanent teeth in a group of children in Ismailia Governorate / Moataz Ahmed Mohamed Salah Eldin Elkhatib ; Supervised Norhan Abdelwahab Eldokky , Rania Abdallah Nasr

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

Introduction: Eruption times of teeth in Middle Eastern countries are still based on American and European standards. Therefore, a national project for Egyptians children teethwas required. Aim: Determine eruption dates&sequence and to correlate between chronological and developmental age of eruption of primary and permanent teeth. Methods:Study sample consisted of 1526 apparently healthy Egyptian children of both sexes,1020 children were selected from Ismailia schools, 506 children were selected from children attending Maternal and Child Welfare Centers. Results:Eruption sequence of primary teeth in both sexeswas:LA, UA, UB, LB, UD, LD, UC, LC, LE, and UE. In boys, deviation from the standard range exceeding 50% except for LA, upper and lower E.In girls, deviation exceeding 50% in UC, UE, LA, LB, LC, LD and LE. There were statistically significant difference between means age of eruption of permanent teeth in boys and girls for U1, U2, U5,U6andL6.Sequence of eruption of permanent teeth in boys was: L6, L1, L2, U1, U2, U6, L4, U4, U5, L3, L5, L7, U7 and U3. In girls was L1, L2, U1, U2, U6, L6, L3, L4, L5, U4, U5, L7, U7 and U3. Conclusion:Sequence and dates of eruption of teeth differ among populations.Orthodontists and pediatric dentists can rely on specific standards of Eruption dates & sequence for Egyptians for diagnosis, treatment planning and preventive programs

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