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永久磁石(マグネデント^[○!R])の可撤性ブリッジヘの応用
Get PDFapplication/pdfThis time, we could get the Magnedent^[○!R] that is Sm-Co magnet made by D. V. A. Inc., so we tested its attracting power and applied it for removable bridge, the results were as follows: 1. It showed attractive power as the supplementary retentive equipment of double crown. 2. About one year after setting the prosthesis, the magnet did not decrease its attractive power, but slight corrosion on the part of the keeper occured.journal articl
Bacteroides oralisのヒアルロニダーぜの精製とその性状
Get PDFapplication/pdfFrom a culture supernatant of B. oralis ATCC 33269, hyaluronidase was purified to homogeneity by ammonium sulfate precipitation, DEAE-cellulose column chromatography, gel filtration on Sephacryl S-300, and hydroxylapatite column chromatography. Specific activity increased 12,000 fold and recovery was 5.8% The molecular weight was determined to be 75,000 by gel filtration, and the isoelectric point was 7.6. The optimum pH for the activity was 5.5. The purified hyaluronidase degraded hyaluronic acid, but it had no activity against chondroitin, chondroitin sulfate A, B, C, heparin and heparan sulfate. From degradation products of hyaluronic acid, unsaturated tetrasccharides and disaccharides were detected by paper chromatography.journal articl
両側に発症した急性下顎骨骨髄炎の1例
Get PDFapplication/pdfA case of acute osteomyelitis, which appeared in both sides of the mandible of a 18-year-old man, was reported. Although modern antibiotic therapy resulted in a sharp fall in odontgenic infections, occurrence of opportunistic infection and increases of incidence of resistant strains and anaerobes have been described as a major cause of serious infection. In this case osteomyelitis appeared almost simultaneously in both sides of the mandible, and Streptococcus intermedius, which is anaerobic gram positive coccus and may be uncommonly recognized in osteomyelitis, was only isolated by needle aspiration done in both sides of the mandibular abscess. Streptococcus intermedius was discussed as causative organism of osteomyelitis because of the changing antimicrobial susceptibilities of pathogenic bacteria.journal articl
昭和61年における冠・架工義歯補綴に関する統計的観察 その1 単独冠について
Get PDFapplication/pdfA study was made of 1156 crowns which had been fabricated for patients at the Prosthodontic Clinic of Matsumoto Dental College during 1986. Some of results were as follows: 1) 41.91% of the patients were males and 58.09% were females. 2) 84.43% of the patients were between 20 and 59 years old. 3) Crowns of the upper abutment teeth were more numerous than for the lower abutment teeth. 4) 72.40% of the crowns were fabricated for nonvital teeth. 5) 47.50% of the crowns were fabricated as full cast crowns, 21.63% as facing crowns (15.05% as porcelain fused to metal crowns, 6.57% as resin facing crowns), 9.17% as jacket crowns (all of which were resin jacket crowns), 19.03% as partial coverage crowns and 2.63% as dowel crowns.journal articl
昭和61年における冠・架工義歯補綴に関する統計的観察 その2 架工義歯について
Get PDFapplication/pdfA study was made of 210 bridges which were fabricated for patients at the prosthodontic Clinic of Matsumoto Dental College during 1986. Some of the results were as follows: 1) 86.67% of the patients were between 20 and 59 years old. 2) 50.95% of the patients were males and 49.05% were females. 3) 73.33% of the bridges were fabricated as 3-unit bridges. 4) 84.29% were fabricated as 1-pontic bridges. 5) There were fewer bridge retainers for the lower anterior segment than for other segments. 6) 53.70% were fabricated for vital teeth. 7) 44.24% of bridge retainers were fabricated as full cast crowns. 8) Of pontics, 31.85% were replaced for the lower molar segment. 9) Compared with a similar study in 1985, the number of bridges decreased by 50.journal articl
飲料水中フッ素の許容濃度に関する研究 第1編 麻積村の水道水中フッ素濃度
Get PDFapplication/pdfThe aim of this study is to determine the threshold limit of fluoride naturally contained in drinking water. It is established that the threshold limit of fluoride in drinking water is less than 0.8 ppm in Japan. But this threshold has come under question, as some reseachers have reported the occurence of mild dental fluorosis caused by drinking water containing naturally less than 0.8 ppm of fluoride. In those reports it was difficult to determine what concentration of fluoride was in the water when the teeth calcified, because it was not required that such records be kept. It is most important to know the relationship between fluoride concentration in drinking water and teeth calcification period for deciding the threshold limit of fluoride. It is knwon that Omi village, which was studied, contains rich fluoride in water supplied by an artesian well. The community authority has started to supply new water which contains 0.6～0.7 ppm of fluoride since 1973. We have tried to determine the precise concentration of fluoride in the drinking water during the teeth calcification period of schoolchildren living in this village for 7 years. As a result, we did not have any changes in concentration by collecting the water samples twice a month by all year around.journal articl
顎顔面再建のための動脈弁
Get PDFapplication/pdfIn spite of advance of radiotherapy, chemotherapy, and various combined methods of cancer treatment, en bloc removal of advanced cancer have been attached importance by many surgeons, directing their attention to a rapid method of one stage transfer reconstruction for the resulting deformity. Random flap, forehead flap, and deltopectoral flap were used in most cases to reconstruct defects during the 1960s and myocutaneous flaps were developed during the 1970s. Inrecent years, myocutaneous free flaps which distantly transfer a block of composite tissue without a pedicle by microvascular anastomoses are much improved in reconstructing oral and maxillofacial defects. This means that oral and maxillofacial reconstruction of apparant cosmetic defects necessitates the use of the best tissues for achievement of not only well-shaped appearance but functional movements. Commending features of palatal flap, forehead flap, deltopectoral flap, pectoralis major musculocutaneous flap,latissimus myocutaneous flap, sternocleidomastoid musculocutaneous flap, trapezius myocutaneous flap, platysma musculocutaneous flap, temporal muscle flap, and various myocutaneous free flaps used in the reconstruction of oral and maxillofacial region are discussed in the reviews of literatures and the cases treated in our Dep artment. Success rates of free flap reconstructions amount to more than 90% of cases as presented in some literatures. But maxillofacial reconstructions for mucosal defect are sometimes troubled with the occurrence of necrosis of the flap which results from such factors as excessive tension, torsion or kinking of vessels for complicated anatomy of maxillofacial region, and contamination with saliva. Moreover, the flap should not make the remaining healthy tissue less functional during mastication, swallowing and speech. From the viewpoint of bringing its blood supply, selection of appropriate flap and proper surgical expertise allow us to successfully use arterialized flaps and free flaps to reconstruct particularly defects of the oral region.journal articl