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軟質裏装材の物理的性質に関する基礎的研究 : ポリオレフィン系ならびにシリコーン系の特性について
Get PDFapplication/pdfResilient denture base materials have been recommended to prevent excessive pressure on residual alveolar ridges and to provide a more uniform load distribution by absorbing the "mechanical shock" caused by masticatory forces. The desirable properties of resilient denture base materials and certain clinical requirements have been suggested: (1) non-irritable and non-toxic to the oral mucosa, odorless and tasteless, (2) dimensionally stable during processing and in use, (3) low water absorption, (4) high abrasion resistance, (5) permanent resilience, (6) color stability, (7) adequate bond strength to the rigid denture-base resin, (8) no adverse effects on the denture base such as distortion, loss of strength, crazing, or blanching, (9) ease of processing, finishing and polishing and (10) ease of repair. Physical and mechanical properties of resilient lining materials are very important for these suggestions and are recommended to have consistent quality in order to be used in clinics for as long as possible. The purpose of this study is to evaluate the physical properties of two soft lining materials, polyorefin and silicone.journal articl
脳性麻痺者の歯科診療(水平仰臥位)時における呼吸・循環動態に及ぼす影響について
Get PDFapplication/pdfThe authors investigated respiration and circulation of cerebral palsy by lying on their back (supine) during dental treatment. We measured oxygen saturation (SpO²), endoexpiratory CO² (ETCO²), pulse rate, blood pressure and pulmonary function. Subjects divied into 2 groups; the 1st included 7 cerebral palsy cases with no deformity of the spine or thorax (36.8y, 48.8kg) and the 2nd included 7 cerebral palsy cases with deformity of the spine and thorax (36.2y, 46.3kg). The results obtained were as follows: 1. SpO² of cerebral palsy with deformity was significantly lower than that of cerebral palsy with no deformity. 2. ETCO² of cerebral palsy with deformity was significantly higher than that of cerebral palsy with no deformity.journal articl
歯牙フッ素症1症例の病理学的検索
Get PDFapplication/pdfPathological changes of a mottled tooth were examined by microradiography and scanning electron microscopy. The tooth was a maxillary right central incisor of a 10-year-old boy, which had been removed by a traffic accident. The boy had lived in Ikuma, Takagi Village, Nagano Prefecture, and had used village water containing about 2.6 ppm fluorine for 6 years,: between the ages of 0 and 5. Under the light microscopy Retzius lines were clearly observed in the enamel, and enamel rods were distinguished by the presence of spaces at the subsurface region. Microradiography revealed that the inter spaces of the enamel rods showed radio-opaque lines which made the enamel rods visible. These changes were clearly demonstrated by scanning electron microscopy. Underneath the surface contract enamel, interenamel rod gaps were present. Within the dentin, interglobular dentin appeared numerously and widely, and in these area no paritubular matrices had formed.journal articl
鋳型内のワックスの軟化と鋳造精度について
Get PDFapplication/pdfThe setting expansion of phosphate bonded investment material was obstructed by the load. Therefore, the result was casting shrinkage increase accompanied by a decreased flow of the wax pattern. Setting expansion can be obtained sufficiently by softening wax or melting wax. The wax pattern was invested with investment material. After leaving it for 10, 20, 30, and 40 minutes, the mold was kept in a bath at constant temperatures of 55℃ and 65℃ for 60 minutes. This study measured the roughness, compressive strength, setting expansion and heat expansion of investment material, while investigation the relationship between their properties and casting accuracy. The results may be summarized as follows; 1. When the mold was warmed only briefly the setting expansion decreased. There was no significant difference between 55℃ and 65℃. 2. The heat expansion using a non-warmed test piece was larger than with a warmed test piece. 3. The compressive strength of the test piece when warmed to 55℃ was greater obtained stronger than other test pieces. When the test piece was warmed briefly the compressive strength was decreased. 4. The setting expansion was affected by viscosity of wax. 5. When not sufficiently hardened, the setting expansion of the mold obstructed the wax pattern. 6. The thermal expansion due to high softening temperature and high melting temperature of pattern materials affects casting accuracy. But, with a hardned mold pattern materials could not change dimension. 7. The surface roughness increased when the mold was warmed briefly, after the investment was mixed.journal articl
舌癌放射線治療後の下顎骨壊死の一症例
Get PDFapplication/pdfA 54-year-old male patient with histologically proved squamous cell carcinoma of the tongue was treated with external radiotherapy. A 57 Gy tumor dose was given to the mandibula with external irradiation and isodose curves were measured with modulex RTP. The mandibular radionecrosis were evaluated radiographycally and displayed in 3DCT images. It was determined that radionecrosis developed with relatively low dose TDF86.3DCT is a useful modality for the observation of mandibular radionecrosis.journal articl
