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Calcifying Odontogenic Cystの1症例
Get PDFapplication/pdf1. 12才男子の右側下顎小白歯部に発生したcalcifying odontogenic cystの1症例を経験した. 2.開窓手術を行ない経過観察後に摘出を行なったため,典型的な嚢胞ではなかったが,その侵襲によると思われる小さい胞巣形成が認められ,本嚢胞が腫瘍的性格を持っていることが示唆された. 3.本邦におけるcalcifying odontogenic cystの報告を通覧したところ,本症例が第27例目であることが確認された.journal articl
圧縮応力に対する下顎骨の物理的性状
Get PDFapplication/pdfThe mandible was compared with the humerus, as the control, in below listed physical characteristics against compression stress. Nine adult dogs were examined. Immediately after the dog had been killed, bone specimens were taken from the mandible of beneath the first molar and from the surgical neck of the humerus, and were prepared to columns of 3mm in diameter and 3mm in height for spongy bone and of 2mm and 5mm for cortical one. Then the specimens were examined by the Autograph (Shimadzu IS 5000) in the Department of Dental Technology, Matsumoto Dental College. Analyzing the compression stress-strain diagram, following results, as the means, were obtained; the strength (×10^5g/cm^2), proportional limit (×10^5g/cm^2) and modulus of elasticity (×10^6g/cm^2) were 1.13, 0.70 and 1.66 for the mandible spongy bone, 10.01, 7.74 and 32.96 for the mandible cortical one, 0.54, 0.43 and 1.08 for the humerus spongy bone, and 14.46, 9.59 and 35.66 for the humerus cortical one, respectively. The differences between the spongy and cortical bones, and that between the mandible and the humerus were discussed.journal articl
象牙質中のリンタンパク質の分離法と特性
Get PDFapplication/pdfThe formation of a hydroxylapatite-like mineral from an amorphous calcium phosphate in vitro was shown by the recent biochemical study on the phosphoprotein of dentine matrix. The phosphoprotein which contains organic-bound phosphorus as O-phosphoserine revealed the specific properties on the crystal formation. The present review is mainly concerned with the isolation and chemical nature of the phosphoproteins from dentine matrix.journal articl
走査電子顕微鏡による歯根膜線維の観察
Get PDFapplication/pdfThe fibers of the periodontal ligament were observed in twenty albino rats, ten mongrel dogs and ten Japanese monkeys under ordinary microsiope and scanning electron microscope. For the electron microscopy, after dehydrated with acetone and by the critical point method, the specimens were coated with carbon and gold. The periodontal ligament was observed at the cervical part, middle part and the apical part of the root. The results are as follows: 1) The principal fiber bundles run from the alveolar bone to cementum and they did not from a network. The intermediate plexus, however, were observed in middle layer of the periodontal ligament at the cervical part. This intermediate plexus was clear at the incisor tooth. 2) The principal fiber bundle was made up of the fibers 1200 A to 1500 A, and indifferent fiber plexus was made up of the fibers 800 A to 1200 A in diameter. The principal fibers and the indifferent fibers did not anastmose together. 3) The indifferent fibers made up the plexus in middle layer of the periodontal ligament. The indifferent fibers plexus was the most dense plexus in middle layer of the periodontal ligament. Density of the plexus, however, was reduced immediately adjacent to alveolar bone and cementum.journal articl
