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Five hundred orthopantomograph radiographs of mexican children and adolescent from 7 to 18 tears old were reviewed in order to establish the third molar formation and calcification stages and the most frequent anomalies related to these teeth. We find that tooth bud presence is between 9 and 11 years; Third molar is absent in 32.4% of the population; 7.4% of the molars presented early formation stage malposition; Therefore oligodontia diagnosis and third molar malposition can not be done before 13 years of age.

Male patient, 9 years old 6 months who received an alveolodental traumatism is report: presents horizontal radicular fracture in right upper lateral and both central incisors with displacement of the lower segment of the lateral incisor out of the bone. Fragments were aligned and a splint made of wire and resin was placed for about 21 days. It was not necessary endodontic therapy, and was examined through a year. It was not evident any pulpar pathology or resorption and fragments joint.