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PURPOSE: This retrospective study was intended to assess the frequency and distribution of different types of odontogenic tumors relative to the WHO 2017 latest updates, by reviewing the records of the oral and maxillofacial department, faculty of dentistry in Alexandria throughout a 5year period. METHODS: The records related to the years January 2014 till December 2018 at the oral and maxillofacial department of the faculty of dentistry in Alexandria were inspected. The odontogenic tumors were investigated for the frequency, gender, age, site. The data was recorded then analyzed using Microsoft Excel 2016. RESULTS: Two hundred and fifteen tumors were documented, out of which 26 (12.09 %) cases confirmed the diagnosis of odontogenic tumors (OTs). 15 (57.69%) of the assessed OTs occurred in females while 11 (42.31%) were seen in males. The average age of the patients was 28.65 ranging between 7 and 73 years. Benign odontogenic tumors comprised 23 (88.46%) cases while 3 (11.54%) cases were malignant. 14 (53.85%) of the assessed OTs were located in mandible the while 12 (46.15%) were in the maxilla. The odontoma was found to be the most prevalent OT represented in 9 (34.62%) cases followed by ameloblastoma in 4 (15.38%) cases. CONCLUSIONS: Differences between our findings and those of previous studies of various populations were witnessed. OTs may greatly diverge according to the version of classification used and by the sample size of the study. (2116) Marwa G. Noureldin and Hala R. Ragab E.D.J. Vol. 65, No. 3 The WHO classification allocated OTs into two major categories; malignant and benign however, the etiology is still unknown. Most of benign OTs seem to occur de novo, while the malignant OTs more often occur from their benign precursor but may start de novo. The 2005 classification systematized benign OTs as ‘Odontogenic epithelium with mature, fibrous stroma without odontogenic ectomesenchyme,’ ‘Odontogenic epithelium with odontogenic ectomesenchyme, with or without hard tissue formation,’ and ‘Mesenchyme and/ or odontogenic ectomesenchyme with or without odontogenic epithelium’. (3) Continuous renewal of this dynamic classification was achieved with new entities added, and some older entities eliminated. The WHO 2017 (4th) edition is the final update, announced at the beginning of 2017. (Table 1) OTs are now categorized in a simpler way than 2005 edition as epithelial, mesenchymal and mixed according to the tissue they originated from. Moreover, the 2017 classification presented malignant odontogenic tumor in a simpler form than the detailed and complicated classification of 2005. (4) The purpose of this study was to evaluate the frequency and distribution of several types of OTs relative to the WHO 2017 latest updates, by reviewing the records of the oral and maxillofacial (OMF) surgery department, faculty of dentistry in Alexandria throughout a 5year period. MATERIALS AND METHODS This retrospective study was executed to evaluate the frequency of occurrence and distribution of OTs in the period from January 2014 till December 2018 at the OMF surgery department of the faculty of TABLE (1) WHO 2017 classification for benign and malignant odontogenic tumor 2017 WHO classification

Latest update of odontogenic tumors in Alexandria University, Egypt: A 5-year retrospective study using WHO 2017 classification