Journal of AdvancedMedical and Dental Sciences Research

Background: The classification of these tumours based on origin and histological criteria has been internationally accepted. Odontogenic tumours (OTs) arise from epithelial, ectomesenchymal and/or mesenchymal elements of the tooth forming tissues. The present study was a retrospective study to report occurrence of odontogenic tumors in 7 years. Materials & methods: This study was conducted in Department of Oral Pathology and Microbiology from year 2007 to 2014. A total of 90 lesions were found to be odontogenic tumors and were classified into benign and malignant tumors. They were further subdivided into 3 subtypes based on the types of odontogenic tissues involved as epithelial odontogenic tumors (EOTs), mixed odontogenic tumors and mesenchymal odontogenic tumors (MOTs). Results: Out of 90 OTs, 80 were benign and 10 were malignant. Benign tumour was ameloblastoma (AME) (20), followed by KCOT (15), CEOT (12), compound odontome (OD-Cd) (12), complex odontome  (OD-Cx)(10), odontogenic fibroma (OF) (4), odontogenic myxoma (OM) (4), cementoblastoma (CB) (3). Most common malignant tumour was primary intraosseous squamous cell carcinoma (PIOSCC) (5) followed by fibrosarcoma (FS) (4) and ameloblastic carcinoma (AC) (1). Most OTs were seen in age group 41-50 years, 51-60, 21-30 years, 31-40 years and 61-70 years. Ameloblastoma was most commonly seen in fourth decade (6), KCOT was most commonly seen in third decade (6), CEOT was most commonly seen in sixth decade (4). OD-Cx was seen most commonly in second decade (5), OD-Cd was seen most commonly in first decade, OF was seen in third decade (2) and OM were seen in second decade (2) and CB was seen in fourth decade (3). 2 cases of PIOSCC was seen fifth decade, 3 cases of AC were seen in fifth decade and 1 case of FS were seen in fourth decade. Ameloblastoma was seen in mandible (16) and maxilla (4), KCOT in mandible (12) and maxilla (3), CEOT mandible (11) and maxilla (1), complex odontoma in mandible (9) and maxilla (3), compound odontome in mandible (3) and maxilla (7), OF in mandible (3) and maxilla (1), OM in mandible (2) and maxilla (2), CB in mandible (2) and maxilla (1), PIOSCC in mandible (4) and maxilla (1), AC in mandible (2) and maxilla (2) and FS in mandible (1). The prevalence of ameloblastoma was 22.2%, KCOT (16.7%), CEOT (13.4%), complex odontoma (16.7%), compound odontome (11.5%), OF (4.4%), OM (4.4%), CB (3.3%), PIOSCC (5.5%), AC (4.5%) and FS (1.2%). Conclusion: There was geographic and demographic variation in distribution of odontogenic tumors. Benign odontogenic tumors were more common than malignant OTs. Ameloblastoma, KCOT, CEOT and odontoma were most common tumors
Key words: Ameloblastoma, Compound odontome, Odontogenic tumors