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Patient: The patient is a 71-year-old woman who had undergone a gingivectomy due to a gingival carcinoma of right maxillary sinus and a denture was made for the defected jaw., Discussion: During three years and six months, |3 serves as the guidance tooth had suffered from various symptoms, from the detachment of the neighboring tooth to the use of an OP anchor followed by a partial fracture of the cuspid root. However, |3 has not been removed in accordance to the patient's request. In addition, a relining provided indirectly to the denture, it is still maintained and used for mastication, pronunciation and swallowing functions without difficulty., Conclusion: This is a case that a denture was made for the defected jaw. However, it is important ot take measures in the future, as the remaining tooth is not expected to be preserved for long.

A remarkable gingival pigmentation around the restorated teeth was successfully treated by simple surgical removal; incision & coagulasion of deposits by electrosurgery. Before the treatment, a biopsy from the pigmented gingiva was histopathologically examined, and a lot of small pigment deposits were found in the lamina propria with no inflammation, but not in the epitherium. Elements constructing the deposits were also determined by means of an electron probe X-ray microanalyser. Silver was found to be the principal element of the deposits, but not found at all in the crown metal. These results suggested that the cause of the pigmentation was implantation of metal fragments from metal cores during abutment teeth preparation. Therefore, the surgical removal was performed. Relapses have not occurred for 3 years since the treatment.

Diphenylhydantoin, which was first introduced in clinic by Meritt and Putnam in 1938, has been in wide use for the treatment of epilepsy because of its excellent antispasmodic action. On the other hand, Diphenylhydantoin induced gingival hyperplasia has been examined by many authors in the dental field since gingival hyperplasia was reported by Kimball as its side effect. Recently, we had an opportunity for performing gingivectomy on hypertrophic gingivitis in an epileptic with mental retardation and visual disturbance, on Phenytoin (5,5-Diphenylhydantoin) medication. Some information obtained is reported, together with its therapeutic course.