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The purpose of this study was to assess the ability of serious periodontosis patients to regain satisfactory biting function, using the patients' own teeth, by regeneration of the alveolar bone. Twelve serious periodontosis patients whose alveolar bone was markedly absorbed and whose teeth were quite unstable were treated with replanting of their teeth and grafting of cancellous iliac bone and gingival flaps by the clinical team, which consisted of plastic surgeons and dentists. No patients developed postoperative complications (e.g., infections), and grafted iliac bone took in all patients. The total number of replanted teeth was 65, and only 4 of them fell off (92% take rate). Three to 4 months after surgery, the replanted teeth received prosthetic treatment so that the patients could begin biting. Ten patients were monitored for 5 months or longer, and they started to eat normal food after the fifth month. Regained biting function and satisfaction of having food were almost the same as before the periodontosis became severe in these 10 patients. Regeneration of alveolar bone was confirmed in later radiographs. To date, the maximum follow-up period is 2 years and 8 months (average = 1 year and 6 months). All patients have good biting function, and there have been no findings of absorption of reconstructed alveolar bone or of the root of replanted teeth. This treatment method would be quite useful for patients with serious periodontosis.

Plasma-treated lenowoven polyethylene ribbon was used for splinting between teeth around osteotomy lines in anterior segmental dentoalveolar osteotomy. This fixation was continued for 2 to 3 months, during which there was no damage or fall of the ribbon. In addition, the patients were able to eat their usual food, had much less pain in the teeth and oral mucosa, did not feel uncomfortable in the mouth, had no tooth damage or carious teeth, and had a good aesthetic appearance. In all eight jaws (five patients), accurate and strong bone fixation was achieved based on the planned occlusion. Patient complaints and pain were obviously less with this method than other methods. Polyethylene ribbon is quite useful for bone fixation in anterior segmental dentoalveolar osteotomy.

We report a case of mucosal cyst of the maxillary sinus with extensive maxillary bone resorption. A 47-year-old man was referred to our clinic with a chief complaint of a swelling in the left cheek.Radiography revealed a dome-shaped radiopaque shadow at the floor of the left maxillary sinus.The cyst was resected.Histopathological examination revealed a mucosal cyst of the maxillary sinus.Postoperatively, there has no evidence of recurrence as of one and a half years after the operation.