Ultrastructural study of benign cementoblastoma

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  • Hatakeyama Setsuko
    Department of Oral Pathology, Iwate Medical University School of Dentistry
  • Noda Mieko
    Department of Oral Pathology, Iwate Medical University School of Dentistry
  • Satoh Masanobu
    Department of Oral Pathology, Iwate Medical University School of Dentistry
  • Suzuki Atsumi
    Department of Oral Pathology, Iwate Medical University School of Dentistry

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Other Title
  • 良性セメント芽細胞腫の電子顕微鏡学的研究

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<p>In this report, ultrastructure of benign cementoblastoma occurring in the first molar of the left mandible of a 23-year-old man was studied. The tumor tissue, which we examined, was composed of sheet and network of cementum-like tissue and relatively scanly connective ti-ssue. In our light microscopic observation, eosinophilic polygonal cells, multinuclear giant cells,entrapped cells, and small spindle-shaped cells, which existed in or around calcified tissue, were identified as cellular components. Eosinophilic cells showed pleomorphic features from mitochon-dria-rich polygonal cells to mitochondria-poor ovoid cells. Mitochondria-rich cell with irregular nucleus and dark cytoplasm had the same features of well-developed rough surfaced endoplasmic reticulum, a lot of Golgi apparatus, and several finger-like cytoplasmic processes as those of os-teoblast. Moreover, the mitochondria-rich cell was characterized by rough surfaced endoplasmic reticulum in lamellar arrangement and abundant mitochondria lying besides it. These characteris-tics were also observed in the tumor cell of benign osteoblastoma. In contrast, mitochondria- poor cell had ovoid nucleus and half-bright cytoplasm, which common in cementoblast. The ex-istence of the latter cell has not been recognized in benign osteoblastoma. Taking this point into consideration, benign cementoblastoma can be regarded as different from benign osteoblastoma.</p>

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