[Classification of mesenchymal odontogenic tumors]

A retrospective series of 9 purely mesenchymal odontogenic tumours was found to consist of 3 odontogenic fibromas, 2 myxomas, and 4 cementomas including one true benign cementoblastoma and two cementifying fibromas. One as seen to contain a conspicuously blood supplied proliferating fibrous component giving the tumour the appearance of a malignant process though no relapse was noted after the jaw resection. Periapical cement dysplasia was seen in only one case of the group; there was no case of gigantiform cementoma. The problems of mutual differential diagnosis and distinction from osteogenic tumours are subject to discussion.