Benign cementoblastoma is a tumor of the cementum that occurs in connection with the dental root and is believed to be a very rare lesion. We experienced two cases of this tumor.
Case 1 was a 13-year-old girl with the lesion at the |6 root apex. Case 2 was a 20-yearold man with the lesion at the 16 root apex. The excised mass was dove's egg size in both cases. Both patients were diagnosed as having benign cementoblastoma as a result of a synthetic judgement of the clinical and histopathological findings and other factors. Decalcified and nondecalcified staining sections of the same specimen were prepared from each patient for pathological examination. The nondecalcified staining sections were examined for calcification by color analysis using the M-301 B image analysis system after the microradiogram was prepared. In these two cases, hard tissues with calcification of the same degree as that of the cementum and/or dentin were dendritically or radially arranged around the dental root. In the peripheral area, narrow hard tissues with hypocalcification were arranged. Sections with the same hypocalcification as that in this area were scattered in the central area. The dental roots adjacent to the hard tissues were adsorbed vermicularly, and these hard tissues were transferred to the cementum. We reported these two patients, together with 41 previously reported cases, with references to the literature.
