Abstract
<h3>Objectives</h3> In 2017 the World Health Organization (WHO) reported a new classification of odontogenic tumors (OTs). The epidemiologic effect of these changes has not been observed in the literature. The aim was a retrospective and reclassification analysis of OT diagnosed in a reference service. The prevalence and description of the main characteristics of these tumors were assessed according to the new classification. <h3>Study Design</h3> Records of 20,348 biopsies over a 40-year period were analyzed. Demographic data and clinical and radiographic characteristics of each lesion were assessed. Final diagnoses were reclassified according to WHO updates. Inconclusive exams will be reassessed in the future. <h3>Results</h3> In the sample, 322 lesions were diagnosed as OT, representing 1.58% of all diagnoses. Considering inclusion criteria, 226 samples were reevaluated. The most frequent tumors were odontoma (45.6%), ameloblastoma (31.4%), and myxoma (5.3%). Inconclusive diagnoses accounted for 11.5%, and 4.4% of the sample were reclassified. The predominant population was young and female, and the mandible was most frequent localization. <h3>Conclusions</h3> In comparison with previous studies, there was a significant reduction in the prevalence of OT and a change in the hierarchy of occurrence within the group, thus confirming the significant effect of the reclassification.
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