We proposed a new method of applying an immediate post-surgical maxillary prosthesis made of light-polymerized resin （Maxillofacial Prosthetics 28：91-96, 2006）. Denture relining materials may need to be applied to the remaining tissue for longer tentative use. Clinical experience shows that relining materials tend to peel off the obturator materials. However, there is no information about the bonding strength among the materials. The purpose of this study was to examine the bonding strength between light-polymerized resin （Denture-AidTM） and relining materials or tissue conditioning materials. Experimental models were fabricated using the light-polymerized resin and three types of autopolymerizing resins （Mild RebaronTM, RebaseⅡTM, UnifastTM） and tissue conditioning materials （Soft LinerTM, Tissue ConditionerTM, Visco-gelTM）. The effect of primers on bonding was also examined. The maximum bonding strength of each material was measured by tensile and shear tests. As a result, the bonding strength of tissue conditioning materials against Denture-AidTM was lower than that of the autopolymerizing resin. The bonding strengths increased after applying the composite resin primer and increasing the surface roughness. Therefore, it is suggested that relining of the light-polymerized resin required surface modification to increase bonding strength.

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Although von Recklinghausen’s disease is not rare, the frequency of oral involvement is low. We report a patient with an oral neurofibroma that caused masticatory dysfunction. A 58-year-old man with a chief complaint of tumor formation in the floor of the mouth was referred to our department on July 1, 2003. The patient had multi-nodular masses on the skin from the age of 10 years. Because of recurrence, he had received a number of operations for thigh tumors approximately once a year from the age of 38 years. Clinical examination revealed a pedunculated elastic soft mass in the anterior floor of the mouth. The tumor was 25×13×22mm in size and extended to the lingual side of the anterior teeth. Excision of the tumor was performed under local anesthesia and an immediate denture was applied to cover the operation wound and keep the depth of the floor of the mouth. The post-operative course was good and the denture was satisfactory to the patient. Masticatory efficiency 12 months after operation was 2.1 times that measured during the preoperative period, indicating that the operation and prosthodontic treatment contributed to the recovery of mastication. There has been no evidence of recurrence during the follow-up period.

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The patient was a 64-year-old male with fully hard palate defect, which was caused by a maxillectomy ten years ago. Although a dento-maxillary prosthesis was fabricated and adjusted at a hospital for a year, the prosthesis did not satisfy the patient.
Since maxillofacial prostheses are not stable on mastication, it is very difficult to manage the pressure distribution under the denture. In this case, the palate which receives the functional force from the denture is very narrow, therefore the dento-maxillary prosthesis was hardly stable and it was impossible to distribute the pressure under the denture evenly.
At first the old denture was adjusted and a new dento-maxillary prosthesis was fabricated with the dynamic impression technique. Soft lining material was used for the hollow-type obturator to reduce the weight of the prosthesis and lingualized occlusion was applied to reduce the pressure on the supporting structure under the prosthesis.

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Gingival fibromatosis is a relatively rare condition of gingival hyperplasia and seldom accompanied with bony changes. We present a case of gingival fibromatosis with deformed alveolar bone in a 35-year-old woman. Gingival hyperplasia and significant displacement of the remaining carious teeth had spoiled her appearance. In the molar region, a decayed crown had resulted in loss of teeth contacts leading to interjawal contact by the hyperplastic maxillary and mandibular ridges. To improve her appearance and restore masticatory function, we planned surgery which consisted of extraction of all remaining teeth, gingivectomy and selective alveolectomy in one operation. Since it was difficult to re-shape the alveolar ridge, surgical templates （STs） and immediate dento-maxillary prostheses were fabricated preoperatively, which were based on precise model prediction. The use of STs during the operation helped to maintain the preoperative position of the jaw and to operate quickly and easily. Immediate dentures were fixed with circumferential wiring for 3 weeks. Seven years have passed postoperatively, and the patient is contented with her appearance and masticates well with dentures.

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