Benign cementoblastoma--cementum analogue of benign osteoblastoma?

We believe that the current case is a good example of a "borderline lesion" that shows the histologic features of benign osteoblastoma but with some clinical features suggestive of a cementoblastoma, such as attachment to the roots. We suggest, however, that the involvement of the roots should not rule out the diagnosis of benign osteoblastoma. The fact that a benign osteoblastoma may envelop the roots in a way characteristic of a benign cementoblastoma, however, is suggestive of a close relationship between the two tumors.