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Methanol-cellulose Nitrate Embedding Method for Histological Morphometrical Analysis
Get PDFapplication/pdfVery recently we developed a new embedding medium, "Shiojirin-E", made chiefly of cellulose nitrate (Kawakami et al. 1995)^&;t;1'2)>. During the course of its development, we noted that cellulose nitrate would be a very suitable embedding medium for morphometric analysis, especially because of its low and constant rate of contraction. But the highviscosity of this medium resulted in a very slow rate of infiltration. Therefore we sought to develop a new, better histological embedding medium for morphometric analysis based on information on the methanol-cellulose nitrate method by Seki (1937)^. After trial and error, we succeeded in our goal : The composition of the medium is as follows : cellulose nitrate 15.0g, methanol 78.6g, and others 6.4g (total of 100.00g). When the specimens are not so big, we can easily get 3-5 micron-thick sections like paraffin sections with complete non-contractibility. We believe that this new methanol-cellulose nitrate medium will be useful especially for histological morphometrical analysis.journal articl
歯と人工歯の大きさの比較1.上顎前歯
Get PDFapplication/pdfTwenty-five of each of extracted maxillary right central incisors, lateral incisors and canines exhibiting little incisal wear were obtained from Japanese subjects. In these, and artificial maxillary anterior teeth (Real Crown by Shofu Inc. and Duradent by G-C Dental Industrial corp.), length of crown, breadth of crown and breadth of cervix were measured, and length-breadth index of crown and breadth of crown-breadth of cervix index were calculated. The measurments for the natural teeth were compared with those of the artificial teeth. 1. Compared to the natural teeth, the artificial teeth had smaller mean length of crown for all three basic types (Square, Tapering and Ovoid types). Length of crown for the T type of central incisor and all types of lateral incisor from Company A were larger than the natural teeth, but the central incisor, lateral incisor and the canine from Company B were smaller for all types. 2. Compared to the natural teeth, the artificial teeth had a smaller mean crown breadth for all three basic types. The lateral incisors were particularly small at approximately 85 to 95% of the size of the natural lateral incisor. 3. Compared to the natural teeth, the S and O types from Company A had a larger breadth of neck than the natural teeth. The other types had a smaller breadth of neck than the natural teeth. Compared to the natural central incisor, the breadth of the neck of artificial teeth from Company A were 108.3% for S type, 89.1% for T type and 105.2% for O type, whereas those from Company B were 93.2% for S type, 86.4% for T type and 91.0% for O type. Breadth of neck of the artificial lateral incisors was 92.1% to 107.2% for Company A products, and 88.6% to 89.7% for Company B. Breadth of neck of the artificial canine teeth was 91.7 to 98.3% for Company A, and 85.7 to 92.4% for Company B. Of the artificial teeth from both companies, T type were the smallest, O type were intermediate, and S type were the largest. 4. The breadth of crown-breadth of cervix indes of artificial and natural teeth uese compared. The artificial T type lateral incisors and T type canines were smaller, but the other types were larger. Among the tree basic types, T type were the smallest and S type were the largest.journal articl
プラークコントロール不良によりインプラントを撤去した1症例
Get PDFapplication/pdfIn recent years, implants have been widely used in dental and oral medical fields. We encountered a patient who required implant removal due to poor oral hygiene. The patient, a 67-year-old man, had been fitted with dental implant in September, 1985. He had shown good oral hygiene for 6 years after implantation, but during the next 2 years he did not attend his scheduled checkups. It was during this time that the poor oral hygienic condition resulted in persistent pus discharge and swelling around the peri-implant gingiva. X-ray examination disclosed a bone defect around the implant. Thus a system that maintains oral hygiene without continued checkups, even when the patient's systemic condition becomes poor, should be devised.journal articl
