Background: Eruption is the axial movement of tooth from its non functional position in bone to functional occlusion. Root development represents the fundamental biologic parameter for tooth eruption. Aim: Evaluate the rate of eruption of Permanent maxillary central incisors (PMCI) with respect to chronological age and biological tooth eruption time and late eruption of PMCI to associated local factors. Materials and Methods: A cross sectional study was conducted in 100 children aged between 8-12 yrs. Who visited Department of Pedodontics and Preventive Dentistry, Rajarajeswari Dental College and Hospital seeking dental treatment. After obtaining informed consent, children were randomly selected, examined for age and clinical apparent dentition, grouped as follows,1)Control group includes children with erupted PMCI 2)Study group includes children with late eruption of PMCI, Further, children were radio graphically assessed to determine biological tooth eruption ( 2/3rd of root completion ) and late eruption associated with local factors if any. Results: The data was analyzed with Mann Whitney U test. Mean age of the boys (52%) and girls (48%) was 8-9yrs.The results of control group and study group showed statistical significant difference between intergroup and intra group with respect to 2/3rd of root formation for the eruption of PMCI. Conclusion: Eruption is a physiologic process, where 2/3rdof root completion influences the chronologic eruption of PMCI. Late eruption of the same can be attributed to the presence of local factors.
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