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Existence of the Parasympathetic Postganglionic Nerve Terminals in the Taste Disk of the Fungiform Papillae of the Bullfrog, Rana Catesbeiana
Get PDFapplication/pdfAn investigation was made of the precise origin of the efferent nerve terminals in the fungiform papillae of the bullfrog's tongue. Some axonal enlargements originate from the parasympathetic postganglionic neurons in the glossopharyngeal nerve. Axonal enlargements containing large dense-cored vesicles (100-120 nm in diameter) and small, clear synaptic vesicles (50-60 nm in diameter) were in close contact with the supporting cell in the taste disk. These results seem to provide morphological evidence for the existence of an efferent control system in the taste disk of the bullfrog.journal articl
平成3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 204 bridges which had been fabricated for patients at the Prosthodontic Clinic of Matsumoto Dental College during 1991. Some of results were as follows; 1) 45.1% of the patients were males and 54.9% were females. 2) 88.2% of the patients were between 20 and 69 years old. 3) 62.3% of the bridges were fabricated as 3-unit bridges. 4) 77.9% were fabricated as 1-pontic bridges. 5) There were fewer bridge retainers for the lower anterior segment than for other segments. 6) 47.6% of bridge retainers were fabricated as full cast crowns. 7) 52.2% were fabricated for vital teeth. 8) Of pontics, 25.7% were replaced for the upper incisor segment.journal articl
骨形成因子の担体としてのスクアランに関する病理組織学的研究
Get PDFapplication/pdfBone morphogenetic protein (BMP) is an important bioactive protein, but its bioactivity depends upon the carrier. Therefore, many researchers have tested a considerable number of biomaterials as possible carriers. Squalane is used as an important base for various kind of cosmetics. Thus, it was considered that squalane might be a useful carrier of BMP, and consequently evaluated it histopathologically. Firstly to determine the safety of squalane fluid applied inside the body, the tissue reaction to subcutaneously embedded squalane fluid in adult SD rats was examined. The results are as follows: No macroscopic abnormalities were found in any part of the body of the experimental rats during the experimental period when compared with the control rats. Histopathologically, granulation tissue formation with slight inflammatory cell infiltration was elicited by the squalane fluid, although neither degeneration nor necrosis were recognized in the embedded area. Some of the squalane had been phagocytosed by macrophages in the granulation tissue, but most of it appeared to have been resorbed during the experimental period; no evidence of encapsulation was observed. Then, gelatin capsules containing squalane/BMP (partially purified) mixture were placed under the perimuscular membrane of ddY mice. Two kind of control, gelatin capsules containing only BMP (partially purified) and those bearing squalane only, were used. The embedded areas were histopathologically examined at 1 to 4 weeks after the operation. Varying amount of new bone were formed by endochondral ossification at 2 weeks. The bone of 3 and 4 week-specimens revealed bone marrow already formed. The observations revealed that the squalane/BMP (partially purified) mixture as well as BMP (partiallly purified) only control specimens elicited wide heterotopic bone formation with bone marrow tissue, although there was no bone formation in the squalane-only control group. Accordingly these data suggest that squalane fluid is safe for use inside the body, and that squalane is a useful fluid carrier of BMP: squalane/BMP mixture can be used as an osteoinductive biomaterial.journal articl
幼若永久歯小窩裂溝の清掃に関する研究 : 第1報 SEM観察によるエッチング効果とsealantの浸透性について
Get PDFapplication/pdfIn order to prevent pits and fissures caries and to improve sealant's retention rate, various cleaning methods on pits and fissures of newly erupted permanent teeth have been tested in the present study. Therefore, authors, using a brush-cone, tooth surface polisher (air flow) and a diamond fixed scratch point (D. F. S. P.) which was newly developed by our laboratory, cleaned the extracted human teeth which had no or slightly enameled caries. The authors also applied etching solution to the enamel surface of pits and fissures after cleaning. The effects of cleaning for the three cleaning methods and the resin tags of the sealant replicas were examined comparatively by using a scanning electron microscope. The results obtained were as follows: 1. When the pits and fissures were cleaned by brush-cone and tooth surface polisher, the residual deposit was found. However, when the cleaning of pits and fissures were done by a D. F. S. P., the residual deposit had been totally removed within the reach of the D. F. S. P. 2. From the observation of the etching effect on the enamel surface of pits and fissures and surface of sealant replicas, the penetration of sealant materials and the formation of the resin tags were found to be more certain when the D. F. S. P. was used. 3. With the use of the D. F. S. P., the improvement of the cleaning and etching effect resulted from slightly shaving the enamel. Therefore, the better retention of the pits and fissures sealant can be expected.journal articl
全身麻酔下集中治療児の実態調査 : 育児に関して
Get PDFapplication/pdfIn order to clarify the actual situation of dental treatment under general anesthesia and the nursing methods of these patients, we examined 102 patients receiving dental treatment under general anesthesia at Matsumoto Dental College Hospital's Department of Pedodontics from 1989-1993. The results were as follows: 1. Though the mean month-age of the patients was 41.50±12.5 months, 74% of the patients ranged from 2-3 years old. 2. The adaptation reasons for general anesthesia were young age (63.7%), uncooperativeness with dental treatment (57.8%), and because the patients who lived a long distance from the college hospital (31.4%). 86.3% of the patients had multiple dental caries. 3. The number of dental caries teeth per patients was 14.96±3.5 on the average. The number of average treated teeth per patient was 15.32±3.5. 4. The anesthesia treatment time averaged 211.03±43.2 minutes. Anesthesia was performed by endotracheal intubation in all cases. Also most of the cases were done by nasotracheal intubation and slow induction. 5. In terms of mean month-age of weaning and regularity of nursing, the patients tended to be late and to be nursed more irregularly than ordinary children. 6. A high percentage of the patients eat irregularly between meals and have a preference for soft foods. 7. Most of the patients, as observed by their guardians tended to be selfish, whining and spoiled.journal articl