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中心結節破折により歯髄壊疽を起し、さらにEpulis様腫瘤を形成した1症例について
Get PDFapplication/pdfA 10-year-old girl had a central tubercle at the occlusal surface of the left first premolar of the mandible. On some day it had been broken, then the pulp horn was exposed because it being extremely narrow but long (Figs. 8-10). After pulpitis the pulp became gangrene, and radicular abscess occurred (Figs. 8, 11). On the opposite first premolar a central tubercle still remained even being occurred the attrition (Fig. 3). It was supposed that during the course of fistula-formation the epulis-like swelling was appeared at the gingiva between canine and first premolar (Fig. 1).journal articl
Calcifying odontogenic cystその臨床所見と病理組織像
Get PDFapplication/pdfThe clinical findings, histologic features, histochemical natures and electron-microscopic structures of calcifying odontogenic cyst were introduced in this paper. The review of 19 cases of this cyst reported in Japan derived that the average age was 23.5 years ranging from 9 to 57 years, 10 patients were male and 7 were female, the maxilla in 12 cases and the mandible in 7 cases, and frequently accompanied by an impacted tooth which was chiefly canine and by odontoma.journal articl
日本人下顎大臼歯のProtostylidと頰面小窩の進化
Get PDFapplication/pdfUsing 103 students of the Matsumoto Dental College, variations in the protostylids and buccal pits, as they appeared in the lower permanent molars, were observed. Results as follows. 1. The protostylid occurred in 1 case (0.76%) on each side of the lower first molars. This frequency is a little lower than is found in the American White, and much lower than is found in the Pima Indian. 2. The buccal pit accounted for 65% of the lower first molars, and 20% of the lower second molars. The frequence of the buccal pit in the lower first molars of Japanese people is lower than that of the American White, and greater than that of the Pima Indian, and Indian (Hindu). The frequence of the buccal pit in the lower second molars of Japanese people is lowest. 3. The buccal pit is decreasing from the lower first molar, through the sequence of the second and third molars. This pit is a rare occurrence in the latter teeth, when such a pit is absent on the lower permanent first molars. 4. The pit was observed in 1 case beneath the distobuccal groove of the lower first molars. 5. The pit occurred in 1 case, on the distal half of the buccal surface of the lower second molars, and the groove occurred in 1 case, on the mesial half of the buccal surface in the lower first molars.journal articl
乳歯生活歯髄切断時におけるネオトリオジンクパスタの応用に関する臨床成績
Get PDFapplication/pdfPulpotomy has become one of the most important pulp therapy in caries treatment of deciduous teeth. Since the introduction of formocresol by Buckley, formocresol pulpotomy has been widely used in the field of pedodontics. Neotriozinc paste (10% paraformaldehyde), which is similer formuration to formocresol, was used as a mummifying paste. Roentgenographic and clinical examination were carried out to 121 deciduous teeth during periods of 41 days to 380 days. As a result, 99 cases (81.8%) were favorable and 22 cases (18.2%) were unfavorable.journal articl
生活断髄法における歯髄切断方法
Get PDFapplication/pdfMany studies on pulpotomy have been reported. Most of them were related to the drugs applied to the pulp stump. It is one of the most important factors to obtain good results, how to cut the coronal pulp tissue at the root canal orifice. There are few studies concerned with the technique of pulp cutting. Common technique has many faults such as giving the damage to the radicular pulp tissue. New techniques, including chemical surgery and electrosurgery, were discussed.journal articl
鋳造精度に関する研究(その6)鋳造用Co_Cr_Ni系合金の性質と鋳造条件について
Get PDFapplication/pdfThe relations among the microstructure to mechanical properties and the effects of the mould temperature and the sprue diameters to the casting defects had been studied on Co-Cr-Ni system alloy prepared with various casting conditons and cooling methods. They were molten at 1450℃ or 1500℃ and cast into the moulds heated at 500℃, 700℃, 900℃ or at room temperature. Moulds containing the castings were cooled to room temperature by the following 4 methods; 1) put on the bench just after the casting, 2) put on the bench after kept in the furnace at each mould temperature for 2 hours, 3) kept in furnace till getting room temperature in order to cool slowly or 4) quenched into the water. Results were as follows ; 1) Increased mould temperature made to decrease the hardness of the castings, but the casting temperature of molten metal was unaffected to the hardness. 2) High temperature mould increased the hardness of the castings cooled in the furnace. 3) The hardness of the castings quenched into the water was resembled to that of colling on the bench to room temperature. 4) Tensile and yield strength of these alloys were increased, when they were cast in to room temperature mould. 5) The maximum elongation was obtained in the spesimens cast into moulds at room temperature, and the minimum one was obtained in them cooled in the furnace. 6) On the microstructure grain growth was prominent in the specimens prepared with high temperature moulds. Most precipitates were observed in the specimens cooled from 900℃ in the furnace. 7) The increase in diameter of sprue decreased the casting defects.journal articl
