Sequence and Date of Eruption of Permanent Teeth in A Group of Children in El-Gharbia Governorate

Introduction: Teeth eruption is a dynamic, genetically process which is a part of the odontogenesis and comprises all the tooth movement from the bone crypt until reaching the occlusal plane and starting its function. Objectives: The present study was carried out to determine the eruption dates of permanent teeth, also to study bilateral and maxillo-mandibular differences in the eruption of teeth and finally to assess sequence of permanent teeth eruption among a group of children in El Gharbia governorate. Methods: The study sample consisted of 1000 healthy Egyptian children of both sexes aged from (5- 12 years) were selected from different urban and rural primary schools. They were examined by tongue depressors in the day light, mouth mirrors and light torch for recording presence or absence of teeth. Results: The first permanent tooth to erupt was the lower first molar, erupted at 7.30, 7.41 years in girls and boys respectively and the last tooth to erupt was the maxillary second molar, erupted at 11.23, 11.26 years in girls and boys respectively. Also there were no statistically significant gender differences in mean eruption ages of permanent teeth except lower canine and no significant jaw differences except incisors in both girls and boys &canines and lower second molar in girls. Finally there were insignificant differences between right and left sides in permanent dentition. Conclusion: The eruption dates of permanent teeth are delayed in EL-Gharbia governorate compared to other studies. Girls preceded boys only in lower canine