A clinico-statistical study of odontogenic tumors according to the new WHO histological classification in 2005

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We classified and analyzed statistically 192 odontogenic tumors from the files of the First Department of Oral and Maxillofacial Surgery in Osaka Dental University Hospital from April 1994 to March 2006 according to the new WHO histological classification revised in 2005. None of the tumors were malignant. There was no statistical sex predilection ; the male-female ratio of the tumors was 1.04:1. The average age of the patients was 40 years, with a range from 7 to 87 years. One hundred twenty-five cases (65.1%) were found between the second and fifth decade of life, with a peak in the third decade (22%). The keratocystic odontogenic tumor (54 cases, 28%) was the most frequent type, followed by ameloblastomas (44 cases, 23%), odontomas (31 cases, 16%), osseous dysplasias (25 cases, 13%) and ossifying fibromas (10 cases, 5%). The maxilla-mandible ratio was 1:3.9. The most frequent area of odontogenic tumors was the posterior mandible (40%) followed by the anterior to posterior mandible (17%). Swelling was the most frequent chief complaint (39%), followed by pain (22%). However, 18% of the cases were symptomless. Among 171 surgically treated odontogenic tumors, enucleation with or without curettage was performed in 125 cases (65.1%). At least 5 ameloblastoma cases and 4 cases of keratocystic odontogenic tumors recurred.
大阪歯科学会の論文