نبذة مختصرة : Objectives: The aim of this retrospective study was to evaluate the prevalence of hypodontia in a sample of dental patients, aged between seven and eleven years at University Alfonso X in Madrid (Spain). Materials and Methods: The number of hypodontia cases and the most affected teeth were evaluated in 2500 panoramic radiographs in a random sample of dental patients consisting of 1235 females and 1265 males. We divided them according to age, number of hypodontia resent in each patient (multiple or single), each side, each quadrant either in the upper jaw or in the mandible. The chi-square test (P 0.05). Conclusion: The percentage of total agenesis of 2500 patients studied was 3.48%.
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