Odontogenic tumors in Thai patients

Objectives: To analyze and provide relative frequency and distribution of odontogenic tumors in Thai patients over 30-year period and compare the findings to the studies from other parts of the world.
Methods: Records of the Department of Oral Pathology, Faculty of Dentistry, Chulalongkorn University, with histopathologic diagnosis of odontogenic tumors were reviewed retrospectively from 1984-2014 . The diagnoses were re-classified according to the 2005 WHO classification. The data documented included age, gender, location and type of the tumor.
Results: Two thousand and sixty-two cases of odontogenic tumors were collected, which constituted 11.49% of all oral biopsies. Benign tumor accounted for 99.3% and 0.7% were malignant. Male to female ratio was 1:1.15. Peak occurrence was in second to third decades. Odontogenic tumors were found in mandible more than maxilla (4:1 ratio). Ameloblastoma was the most frequently diagnosed lesion (45.7%), followed by keratocystic odontogenic tumor (KCOT) (23.5%), odontoma (11.9%), calcifying cystic odontogenic tumor (6.4%), myxofibroma (4%), adenomatoid odontogenic tumor (3.8%) and cementoblastoma (2.8%), respectively.
Conclusions: Our study showed relatively high number of odontogenic tumors of all cases received in the biopsy service. Ameloblastoma was the most common lesion followed by KCOT .These results were consistent with the data from Brazil, China, Sri Lanka and Africa. while odontoma was considered as the most frequent diagnosed lesion in the western countries.