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エナメル上皮腫の2症例
Get PDFapplication/pdfTwo cases of ameloblastoma appeared in the mandibles of 52-years-old and 42-years-old men were reported in this paper. In the first case the lesion resembled radicular cyst radiographically, but was diagnosed as ameloblastoma having a large cyst histopathologically. The second case was believed to be a recurrent ameloblastoma 17 years after the operation, and its pathological findings showed so-called ameloblastic hemangioma.journal articl
等高線モアレ縞による立体計測法の歯学への応用について
Get PDFapplication/pdfFormation of Moiré patterns was described by Lord Rayleigh, who used it first for study of grating erregularities. Recently, the generation of surface contours by Moiré pattern techniques has been described. The generation of contour for three-dimensional objects by noncoherent methods is considerably interesting. Severe limitations and difficulties in the coherent methods are well known and will not be discussed here. Moiré topography, which is a new technique of the three-dimensional measurements by the utilizing Moiré fringe, is most welcomed by those who wish to study the shape of three-dimensional objects, because of the simplicity, high accuracy and real time advantage. The basic theory of the Moiré topography to the measuring and analysing three-dimensional objects in the field of prosthetic dentistry is described in this paper. Principle This arrangement has been suggested by Dykes (1970) and uses a point source of light located at the same distance from the Moiré grid as the camera or eyes. The Moiré fringe is formed by the grid and its distorted shadow on the objects. Generally, the depth of Moiré fringe at Nth is obtained as follows: h_N=bNp/(1-Np)where b is the distance of point source of light and eyes or camera from the grid surface, p is the pitch of the grating, and 1 is the distance between a point source of light and eyes or camera. Application to Prosthetic Dentistry Moiré topography has been utilized in an extend over a wide range, for example, medicine, dentistry, fashion industry, engineering and scientific criminal investigation. In prosthetic dentistry, this method has not been utilized in contour generation of three-dimensional objects. So we have interested in Moiré topography for the study of the contour of the patients faces before and after insertion of denture and the contour generation of the edentulous upper and lower casts. And also, this method is useful to observing the contour of natural teeth, and the change of the ridge form after extraction. And it remains that the orientating plane of the patients faces and/or casts which are generated the contour must be established. We are considering how to settle these problems.journal articl
歯科診療における鍼の応用
Get PDFapplication/pdfThe excellent results have been obtained when acupuncture treatment, one of the oriental medical science, is applied to dental practices. The results were as follows: Extremely good results had been found as narcotic effects and mental calmness for the patients having kidney hypertension or allergy to anesthetics during operations, and as blood pressure adjustment after the practices. Good results also obtained in the extractions of wisdom teeth and extirpations of dental pulps for the women in pregnancy, and in the gingival incisions for the children. Also new method called "Shuketsuhou" (combination of effectual spot "Tsubo" for applying acupuncture-treatment) had been expreimented to examine simultaneous anesthetizing effect for both side.journal articl
窩洞形成直後の歯髄反応に関する電子顕微鏡的研究特に象牙細管内への各種細胞の移動について
Get PDFapplication/pdfThe purpose of this communication is to observe the cells moved into the dentinal tubles due to cavity preparation under electron-microscopy. Using 18 dog's teeth, the Class V cavities were prepared by means of air turbin with a diamond point or a tungsten carbide bur without water cooling, and the pulp reactions, especially the cells in the dentinal tubules, were observed electron-microscopically just after the procedures. In oder to get good fixation, the new local-perfusion method from arteria carotis communis, invented by Yoshida, et al. (1974), was applied in this experiment. After the fixation newly preparations of 6 cavities were carried out by the same procedures for the control. The results were as follows; 1. The rod-shaped bodies in the dentinal tubules were found in 13 out of 18 teeth (72%) under ordinary microscopy in the 1μ sections stained with toluidine blue or Paragon stain. 2. Electron-microscopy revealed that the rod-shaped bodies coud be divided into three types of cells; odontoblast nuclei, neutrophilic leukocytes and erythrocytes, according to their origins. 3. The main bulk of the rod-shaped bodies in this experiment, meaning appeared just after the cavity preparation, had resulted chiefly (12 out of 13 cases) from odontoblast nuclei, and partly from neutrophilic leukocytes and erythrocytes (1 out of 13 cases). 4. It shoud be noticed that the movement of neutrophilic leukocytes into the dentinal tubules had occurred even in this experiment. This fact may suggest that neutrophilic leukocytes can respond immediately to the irritation. 5. Not only odontoblast nuclei but also the cytoplasmic organelles, such as mitochondrias, rough endoplasmic reticulum and free ribosomes, were also displaced into the dentinal tubules. 6. The weaving of dentinal fiberes in the tubules may not come from the shrinking of dentinal fibers, meaning direct-biological phenomenon, but from the result of movement of odontoblast nuclei, meaning indirect-mechanical phenomenon. 7. The nerve fibers moved into a dentinal tubule were observed in a case. 8. In the control, the odontoblast unclei also moved into the dentinal tubules. Regarding the fact it was considered that the fixation did not yet complete and the outward movement of the tubule contents was occurred due to cavity preparation. 9. Based upon the above mentioned findings the mechanism of the cellular movement was supposed that chiefly rising of intrapulpal pressure by an inflammatory response and partly the outward movement of the tubule contents due to heat or reduced pressure might be causes. Only the leukocytes could migrate themselves for the defence to irritation. 10. In the reviewing the Japanese literatures, it was found that the displacements of odontoblasts and erythrocytes into the dentinal tubules in the pulpitis specimens were first descrived by I. Ono in 1940, and that the migration of wandering cells into the dentinal tubules was observed in the pulpitis by T. Ono in 1917. In addition these, rod-shaped bodies came from fragments of dentinal fibers in the caries dentin were documented by Hanazawa in 1919.journal articl