著者

村上 守良 六反田 篤 伊東 励 伊波 富夫 祐田 彰 小住 哲也 香月 俊祐 宮崎 秀夫 佐伯 栄一

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.32, no.5, pp.673-685, 1979-01-31

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1964年から1965年にかけて沖縄で大流行した風疹は, 妊娠中であった母親に感染し, 罹患した母親から種々の障害を持った子が出生した.風疹の胎児感染による人体への影響について種々の分野から多数の研究報告がなされ, 長骨の異常, 生歯の異常などが指摘されている.口腔領域の研究報告は少く, 未だ多くの疑問が残されたままとなっている.著者らは発症後12年を経過した昭和52年8月, 沖縄における先天性風疹症候詳児104名(男55名, 女49名)について, 口腔診査, 上・下歯列の印象採得, X線撮影を行ない乳歯残存状況について検討した結果, 次のごとき結論をえた.1.乳歯残存保有者率は男47.27%, 女40.82%, 男女合計44.23%である.2.乳歯残存歯率は男6.27%, 女4.80%, 男女合計5.58%である.3.一人平均乳歯残存保有歯数は男1.25本, 女0.96本男女合計1.12本である.4.1∿4歯の乳歯残存保有者が男40.00%, 女38.78%, 男女合計39.41%で, これは乳歯残存を有するもののうち約90%をしめている.5.歯種別, 顎別の乳歯残存歯率は, 正常児に比し, 第二乳臼歯の残存率が男女とも上・下顎において特に高率である.6.乳歯残存の後継歯の存在率は乳犬歯で, 男86.05%, 女94.29%, 男女合計89.74%, 第一乳臼歯では男85.71%, 女100.00%, 男女合計91.67%, 第二乳臼歯では男89.47%, 女100.00%, 男女合計92.31%である.7.先天性風疹症候詳児は正常児より, 乳歯の晩期残存が多数みられ, 永久歯の萌出が遅滞している.

著者

宮本 謙治 下田 妙子 伊藤 明彦 嶋村 昭辰

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.40, no.5, pp.1124-1136, 1986-10-25

被引用文献数

2

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The morphological and histological characteristic of the teeth of the Afghan pika, Ochotona rufescens rufescence were studied in 12 animals, weighing about 200-300 grams. After the skulls were soft X-rayed, some were prepared for examination on a dissecting microscope and the others for non-decalcified or calcified sections. The main results obtained were summarized as follows. 1. All of the incisors and molars were rootless. 2. The labial and distal surface of the outer incisors were covered with enamel. On the other hand, it was absent on the palatal and mesial surface. For the inner incisors, the four surfaces were covered perfectly with enamel. 3. Enamel was absent on the buccal surface of the upper molars and on the lingal surface of the lower molars. 4. The longitudinal groove found in the labial surface of the outer incisors was filled comparatively thickly with cellular cementum. In the molars, except the lower M_3, bonelike cementum was supplemented along the longitudinal grooves of each lobule (the isthmus) and reinforced the connection between the two. 5. In both the incisors and molars, all of their surfaces including the filling cementum were covered with remarkably thin acellular cementum. 6. The ameloblast being in the process of forming young enamel derived from the enamel organ in the basal end were degenerated gradually toward the occlusal side and were replaced suddenly with the cementoblasts derived from the dental sac. Consequently, on the region cementum covered over enamel (on the occlusal side). Where enamel was absent, neither ameloblast nor inner enamel epithelium was observed. Instead, only short cementoblasts were seen. 7. As compared with the domestic rabbit, the following differences were pointed out. a. The upper M_3 was absent in this animal. b. The lower M_3 of the animal were of single lobule, while those of the rabbit were of double lobi. c. Distribution of enamel in the mesial and distal surfaces of the outer incisors differed slightly between the two animals. d. The region lacking the molar's enamel in the pika tended to be a very little wider than that of the rabbit.

著者

桜井 徹 楊 栄展 田中 豊秋 中山 祥和 吉原 純也 今泉 哲

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.40, no.2, pp.496-499, 1986-04-25

被引用文献数

5

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A case of inverted tooth eruption in the nasal cavity is reported. A 59-year-old female was referred to the Kyushu Dental College Hospital for evaluation of a fistula in the palate by her dentist. The patient complained of nasal discharge and discomfort in the left nasal cavity. Radiographic examination revealed an inverted tooth in the left nasal cavity. Literature on the inverted tooth was surveyed for the past ten-year, and age, sex, tooth forms, symptoms, and etiology of the inverted tooth were also discussed.

著者

荷宮 文夫

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.9, no.1, 1955-06-30

著者

平本 嘉助

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.36, no.5, pp.767-783, 1982-10-25

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The author made a topographic anatomical study of the sphenoid bone of the male Middle Kyushuites and compared their topographical features with those of some other authors. Although there have been many roentgenologic studies of the turkish saddle, a few topographic anatomical studies of the dried sphenoid bone have been referred to. The authors of these studies are as follows : Nakahara (1953), Nishimura (1957), Mashimo et al. (1964), Saigusa (1933), Hoshi (1958), Dodo (1974). The sphenoid bone not only has the round, oval and spinous foramen, but also makes the internal orifice of carotid canal and the turkish saddle. Furthermore, it has the pterygoidal process. Their morphological features were observed according to certain classifications and measured. The results were briefly summed up as follows. 1. The following types of the observational features showed the highest percentage in the Middle Kyushuites as well as in the Kantoites : the transverse ellipse type of the hypophyseal fossa, the concave type of the floor of the turkish saddle, the round type of the round foramen, the ellipse type of the oval foramen, the round type of the spinous foramen. 2. The internal orifice of carotid canal showed the highest percentage of the C-type in the Middle Kyushuites and in the Kantoites. 3. The following observational items showed no statistically significant differences among the Middle Kyushuites, the Tohokuites and the Kantoites : Pterygo-spinous foramen, Foramen ovale incomplete, Clinoid bridging. 4. The Middle Kyushuites showed the highest percentage of 75.0% in the foramen of Vesalius. It was significantly higher than the frequencies of the Tohokuites and the Kantoites. 5. The pterygo-basal bridging occurred in 5.8% of the Middle Kyushuites. 6. The pterygoidal process showed the highest percentage of the E-type in the Middle Kyushuites, but of the B-type in the Kantoites. 7. The turkish saddle of the Middle Kyushuites tended to be shallower than that of the Kyotoites, and was shallower than that of the Hokurikuites. 8. As for the maximum and transverse diameters of the oval foramen, there were no statistically significant differences among the Middle Kyushuites, the Kantoites and the Germans. 9. Distances between centers of foramens on both sides in the Middle Kyushuites were nearly equal to those in the Kantoites. 10. The shortest distance in the external cranial fossa between the oval and the spinous foramens was significantly shorter in the Middle Kyushuites than in the Kantoites. 11. Ratio of totaled projected area of the greater wings to that of the lesser wing was 1.72. Ratio of totaled projected area of the lesser wing to that of the body was 1.10. Ratio of totaled projected area of the greater wings to that of the body was 1.86. 12. Between the Middle Kyushuites and the Kantoites, the measurements and indices of the pterygoidal process showed significant differences as follows ; the length of the pterygoidal process in both sides, the middle breadth of the pterygoidal fossa in the right side, and the length-breadth index of the pterygoidal fossa in both sides of the Middle Kyushuites were larger than those of the Kantoites. In the contrary, the following items in the Middle Kyushuites were smaller than those in the Kantoites ; the greatest length of the pterygoidal fossa in the right side, the greatest depth of the pterygoidal fossa in the left side, the breadth-depth index of the pterygoidal fossa in both sides, and the angle of lower edge of the lateral plate in both side, respectively. The differences in the other measurements and indicies were insignificant between the two groups.

著者

守川 雅雄 廖 梓〓 清水 稔弘 安元 和雄 豊田 静夫 小園 凱夫 佐藤 博信

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.37, no.5, pp.945-963, 1983-10-25

被引用文献数

4

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ニュートラルゾーンテクニックは, ニュートラルゾーン(以後, N・Zと記す)内に適切に人工歯が排列され, さらに義歯床辺縁および研磨面からの周囲組織の動態と緊密に適合することによって, はじめて効果的な義歯の維持安定が確保されるという基本的理論に基づいた術式であり, その成果は術者および患者の両者によって大きく評価されている.しかしながら, N・Zは歯牙の喪失および歯槽骨の吸収によって生じた空隙であるために, それ自体が口腔内で占める領域, 形態は, 一定であろうという既成概念があり, その再現性つまり定形性等について行った根本的な研究は見当らない.この研究では, 同一条件下で, 同一術者が繰返えし記録した場合のN・Zの部位および形態の動向と, さらに条件を変えた場合について, 仮想咬合平面上で検討した.当術式によるN・Z記録の再現性は予期していたよりはるかに小さく, 同一患者におけるN・Z中点の記録間で統計学的に有意差の出る割合いは, 切歯部で55.4%, 臼歯部では66.4%であり, 幅については切歯部では41.8%, 臼歯部では49.1%であった.N・Z記録における頬舌的中央線はほとんどの症例で歯槽頂より唇頬側に位置しており, その平均値は切歯部で4.66mm, 臼歯部で1.87mmであった.また繰返えしによる中点のバラツキは臼歯部より切歯部で大きく, 逆に幅については切歯部より臼歯部が大きかった.切歯部と臼歯部の中点間ならびに幅間には正の相関関係がみられたが, 各それぞれ基準点における中点・幅間には認められなかった.他方, 異った条件下でN・Z記録を採得すると従来のものとの間にかなりの変化がみられたが, 術者が代わっただけの条件の変化では著明な変化はみられなかった.このことはN・Zは主として患者自身の機能運動によって記録されるものであり, ある程度の経験さえあれば術者の巧拙にはよらないということを示唆していると考える.

著者

荷宮 文夫 末原 靖弘 矢野 健一郎 上田 茂治 佐伯 玄道 福井 健一

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.21, no.3, pp.305-307, 1967-12-30

著者

石井 貴三男

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.40, no.3, pp.530-554, 1986-06

被引用文献数

34

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With a view to clarifying the effect of calcium-deficient diet on the alveolar bone and tibia at growth stage, sixty male rats of Wistar strain, 3 weeks old, were examined for weight and photographic density and also radiologically, photographically, histopathologically and hemologically. The results were as follows : 1. The weight of those in experimental group decreased slightly at second week. Thereafter the weight increased with time as that of control group. However, the difference in weight between the two groups was great. 2. Radiologically, bone density of the alveolar bone decreased and was low until 5th week in experimental group. However the trabecula coarsened and the alveolar bone thickened. In the tibia, interosseous cortex and medial cortex showed a decrease in width and had about the same width until 5th week. Coarsening and fracture of the bone trabecula were also observed. 3. Photographically, the densitometric curve for the alveolar bone was different for the upper part and for the lower part in experimental group. The curve for the lower part of the alveolar bone declined with time but that for the upper part rose. In the tibia, the densitometric curve for interosseous cortex and for the medial cortex appeared as acute angles at 3rd week, but gradually declined with time and approximated those of cntrol group. 4. In photographic density, bone density of the alveolar bone for experimental group was always lower than that for control group and the difference increased with time. In the latter part of the experiment, bone density of the upper part of the alveolar bone decreased and that of the lower part increased, resembling the density at 3rd week. Bone density of the tibia was low until 4th week but showed little changes. Thereafter, the bone density of interosseous cortex was higher than that of medial cortex and was increasing. Difference was observed as compared with control group. 5. Histopathologically, resorption was observed in the whole of the alveolar bone for experimental group. Almost all of the inner walls of the alveolar bone were resorbed at 5th week and a hypocalcification layer replaced them. In the tibia, a hypocalcification layer appeared on the marrow side of medial cortex at 3rd week, were located at the outer basic lamellae of interosseous cortex at 4th week, and were seen at the outer basic lamellae of the two cortices at 5th week. Harversian canals increased markedly in number in the alveolar bone and tibia. 6. Hemologically, electrolytic serum Ca and the ratio of serum Ca, and serum Ip were low in value and serum Cl was high. Biochemical Al-P, CPK, GOT, and GPT were high.

著者

篠崎 文彦

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.34, no.3, pp.227-239, 1980-09-25

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About ten years ago, dentists had no interest in the hepatitis B virus infection during their practicing. Recent publications in the medical literature indicate that an increased risk of viral hepatitis infection exists not only for physicians but also dentists. Infection with hepatitis B is a well-recognized occupational hazard among health care professionals. It is diagnosed by detection in the blood of Australia antigen, now called hepatitis B surface antigen (HBsAg). The incubation period is long, between 4 weeks to 6 months and the HBs antigen may be present in the blood for 6 weeks or more before and after the onset of symptoms. But clinical hepatitis is only a small number, probably less than 5 percent ; most all is latent infection. Contact of hands with blood and saliva repeatly expose the practicing dentist to potentially infectious materials. Avoidance of accidental cuts and pricks from instruments and needles is important. The wearing of a mask and spectacles may help, as well as washing hands after work.

著者

稲永 清敏 森本 泰宏 瀬田 祐司 大住 伴子 鯨 吉夫 粟野 秀慈

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.62, no.6, pp.224-230, 2009-02-25

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平成19年度に行った九州歯科大学研究室配属のアンケート調査および平成18年度・19年度の研究室配属資料を基に解析を行った.88%の学生が第一希望に配属され,第2希望までに97%の学生が配属された.各分野の学生受け入れ体制に対しては72%がよく計画されていたと回答した.80%の学生は教員の研究室配属に対して熱意があったと感じており,98%の学生が多少なりとも興味を持って研究を行ったと回答した.研究テーマに興味をもてたかという設問と教官の熱意を感じたかという設問との間には強い相関が認められた.さらに研究テーマに興味を持ったことと文献などを積極的に調べたかとの設問の間にも強い相関が認められた.このように,学生は教員の教育意欲に対して敏感に反応しており,それによって研究テーマに一層興味を示し,文献検索などを自ら進んで行うことがわかった.逆に教員が熱意を示さない場合には,学生は研究に興味を示さないことが考えられた.また,基礎系の研究室にだけに配属が限られていた基礎配属から,九州歯科大学の全研究室に配属が可能となった研究室配属にカリキュラムが変更になって,学生が臨床系の研究室に偏って配属されるのではないかと懸念されたが,大きな偏りは認められなかった.

著者

宮崎 三雄

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.1, pp.142-145, 1933-03-25

著者

池尻 茂 古本 克磨 田縁 昭 梶山 稔 坂口 元一

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.19, no.1, pp.50-51, 1965-06-30

著者

増田 純一

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.38, no.4, pp.675-697, 1984-08-25

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The relationship between development and innervation in the early developmental stage of the incisor teeth of the rat was investigated in a period from 13-day fetus, initial development of tooth germ, to 10-day old, beginning of tooth eruption. The results obtained were as follows : 1. At 13-day fetus, the early configuration of trigeminal nerve ganglion was observed and endings of their nerve fibers were short. However, at 14-day fetus, development of the origin of tooth germ was observed with the thickening of epithelium. At this period, no nerve fibers reaching near the tooth germ were observed. 2. At 15-day fetus, the ending of nerve fibers were densely distributed around mesenchymal tissues which were present inside of epithelial tooth germ at cap stage. 3. At 19-day fetus, the tooth germs were in the bell stage. The nerve fibers were observed entering mesenchymal tissues of dental sac and they were rich, especially on the palatal side of maxillary incisors and lingual side of mandibular incisors. 4. At 1-day old, enamel was formed and at the same time small single nerve fibers were first recognized entering the dental pulps of mandibular incisors. On the other hand in the maxillary incisors they were observed at 3-day old. 5. Vascular and nerve canal, where nerve fibers distributed to the maxillary incisors passed through, were gradually displaced toward the incisal ridge as the development of the tooth germs progressed. As a result, the nerve bundles, distributing to the basal portion of the tooth germs and labial periodontium through the vascular and nerve canal indicated a sharp bend to the posterior and superior direction. 6. The nerve fibers in the dental pulp increased in number and amount with time, in addition, their branches increased. After 7-day old, nerve fibers, reaching the odontoblast layer, were rarely observed. 7. At 10-day old nerve fibers in the dental pulps were abundantly observed and elongated to the direction of incisal ridge up to the superior position than the intermediate one and their tips were located around the alveolar ridge ; however, no nerve fibers were observed in the superior portion of the pulp. 8. The nerve fibers in the periodontium elongated with time and were abundant, and at 10-day old they reached at the level of alveolar ridge.

著者

張 皿 吉沢 浩毅 中西 英子 舩越 啓右 福山 宏 吉岡 泉 村木 祐孝 福田 仁一 村田 朋之 黒川 英雄 梶山 稔

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.51, no.5, pp.699-704, 1997-10-25

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The region of the mid-dorsum of the tongue is the preferred site of Median Rhomboid Glossitis (M. R. G.). At present, two theories, a developmental anomaly and inflammatory reaction, are mainly mentioned concerning the etiology of the M. R. G., whereas the absolute cause is unclear. There were four thousand cases in Kyushu Dental College Hospital from 1987 to 1996, but only three cases were diagnosed as M. R. G.. Histologically, Candida hyphae existed in the parakeratinized layer and lymphoplasmacytic infiltration was present in the lamina propria. These findings demonstrated that the etiology of the M. R. G. is a localized chronic Candida infection, not only a developmental anomaly.

著者

野田 修司 野代 悦生 吉松 史恵 楠本 修己 藤田 邦彦 山田 建二郎

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.47, no.3, pp.377-384, 1993-06-25

被引用文献数

2

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Besides good occlusal relationships, most orthodontic patients also expect improvement of their lip profiles. So it is necessary for us orthodontists to be aware of these when making the treatment plan. Three standardized graphics each representing Convex, Straight and Concave types of the lateral soft tissue profile as templates were used. According to the modern sense of facial aesthetics, authors tried to interpret the relation between the E-line and the beauty of lateral soft tissue profile by evaluating the changing of the lower lip position of each template. By the survey that could be helpful in making treatment planning, following results were acquired : 1. All the subjects involving orthodontists, dental students and general persons judged that the better lower lip position for beautiful lateral profile was ranged from 0 to 6mm posterior to the E-line in the normal jaw group (type B). The range was smaller in the mandible retrusion group (type A) and further smaller in the mandible protrusion group (type C). 2. The lower lip position at 2mm posterior to the E-line was found to be the best for beautiful lateral profile in each type. 3. The most beautiful lateral profile was referred to the template of type B with the lower lip locating 2mm posterior to the E-line. 4. No significant differences were found in judgment among the subjects. It was suggested from the foregoing results that the esthetical goal would be successfully expected in the sense of orthodontics by positioning the lower lip at 2mm posterior to the E-line regardless of the jaw relation.

著者

中原 敏

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.29, no.2, pp.167-168, 1975-03-31

著者

粟野 秀慈 安細 敏弘 邵 仁浩 濱嵜 朋子 吉田 明弘 園木 一男 高田 豊 竹原 直道

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.61, no.4, pp.131-132, 2007-11-25

著者

天野 裕治

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.46, no.1, pp.319-328, 1992-02-25

被引用文献数

1

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Using the technique of in vivo microdialysis, extracellular concentrations of serotonin and 5-hydroxyindoleacetic acid (5-HIAA) were determined in the striatum, thalamus, dentate gyrus and prefrontal cortex while Sprague-Dawley rats underwent immobilization stress for twenty minutes. Microdialysis probes had semipermeable cellulose tubes (molecular weight cutoff 50, 000 ; O.D. 0.22 mm). Perfusion was started at 12 or 36 hours after implantation of the microdialysis probe under a freely-moving condition. Measurements of the extracellular concentration of serotonin and 5-HIAA were made at twenty minute intervals, which were started 120 minutes after the onset of the perfusion. Serotonin and 5-HIAA were quantified by a high-performance liquid chromatography coupled with an electrochemical detector. Extracellular serotonin levels increased following twenty minute immobilization stress in all four regions of the rat brain. The immobilization stress relatively increased the extracellular serotonin levels in the prefrontal cortex and dentate gyrus. These results suggest that twenty minute immobilization stress induces the activation of serotonin release in rat brain regions concerning the induction of anxiety.

著者

楪 雅行 佐藤 義輝 内田 康也 田島 清司

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.39, no.6, pp.862-869, 1985-12-25

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The widely used dental Ag-Pd-Au alloy is frequently melted with a gas-air blowtorch, and cast by a centrifugal casting machine. In this case, the timing of casting the molten alloy is generally determined by means of the observation of its appearance at melting. There are few reports on the temperature of the molten alloy at casting. Therefore, the casting temperature of Ag-Pd-Au alloy melted with a gas-air blowtorch was measured, as well as the heating time until the start of castig. This study was scheduled to examine the effects of remelting, flux addition, and operator's experience in casting. Six operators, three well and three poorly experienced, were selected. The casting temperatures adopted by the three well experienced operators tended to rise gradually as the repetition times of melting increased. The difference between the casting temperatures at the first and the 10th melting without flux ranged from 10 to 15℃. On the other hand, the casting temperatures adopted by two poorly experienced operators of the three tended to fluctuate sharply, and no rising tendencies were observed in the casting temperatures. Flux addition in due course of heating the alloy reduced the difference between the maximum and the minimum casting temperature. The rise in casting temperature was suppressed by flux addition in the repeated melting by the well experienced operator group, resulting in about only 5℃ rise from the first to the 10th melting. The time required for heating the alloy from the liquidus to the casting temperature was nearly constant in the case of the well experienced operator group, but in the case of the poorly experienced one it fluctuated sharply, irrespective of flux utilization. Consequently, it may be said that the operator's experience and/or skill are inevitably necessary for casting Ag-Pd-Au alloy by judging the casting temperature from the appearance of the molten alloy.

著者

山田 研治

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.42, no.1, pp.91-105, 1988-02-25

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トノサマガエル(Rana nigromaculata)の右側舌尖部を分岐部より切断した後, 3か月から約1年間飼育した.夏期は3か月, 冬眠期間を含む場合は約1年間経過後, 切断側舌尖部に再生が認められたので, 左側の舌尖部を対照側として, 実体顕微鏡および走査型電子顕微鏡によって形態学的に, また, 再生部の感覚については生理学的に検討した.走査電顕写真をもとに, 再生部の面積, 茸状乳頭数, 単位面積当たりの茸状乳頭数を調べ対照側と比較した.再生部と対照側の感覚は再生部と対照側の舌尖部を支配する舌咽神経を残し, 他の舌体部の感覚神経を全て切断した標本を作成し, 再生側と対照側の舌尖部に触刺激と化学的刺激を加え, 舌咽神経の応答を比較した.その結果を要約すると以下のようである.1. 夏期3か月, 冬眠期を含む11か月, 12か月および13か月の各群は, いずれにも舌尖部の再生が認められた.20実験例の再生部の面積の平均値は0.9mm^2で, 対照側の舌尖部の大きさの約1/3であった.2. 再生部にも茸状乳頭が認められた.再生部の茸状乳頭数は20例の平均で25個, 対照側は39個であった.3. 20例の再生部および対照側の1mm^2当たりの茸状乳頭数は, それぞれ28.2個と15.5個で, 再生部では, 特に切断部付近に茸状乳頭が密集していた.4. 再生部と対照側の茸状乳頭の平均直径は, それぞれ9.5μmと12.2μmで, 再生部の乳頭は小さかった.また, その形が円形でないものが認められた.5. 各実験例はいずれも触刺激によく応答した.その結果は対照側と同様であった.6. 再生側は化学的刺激によく応答した.再生側の化学的刺激に対する応答は対照側舌尖部の場合と全く同じ傾向であった.7. 水刺激の場合, 刺激液の流出と同時に応答し, 刺激を止めた後にもわずかにインパルスが発生し, 消失した.0.5M NaClの場合も水と同様に刺激の開始と共にインパルスが発生し, 刺激を中止した後にも, かなり長くインパルスが発生した.また, インパルスの頻度はもっとも大であった.0.01M HClの場合, 刺激開始直後, 短期間インパルスが群発したが, 刺激中にも消失した.0.5M sucroseはインパルスが発生しない例や, 発生してもごく少数であった.0.01M quinine-HClの場合には, 頻度の低いインパルスが発生した.この場合にも刺激を中止した後にも少数のインパルスが持続した.