文献一覧: 増田純一 (著者)

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.

2021-12-17 05:28:15
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https://ci.nii.ac.jp/naid/110003007310

1 0 0 0 <b>変わりゆく日本の歯科医療 </b>:海外歯科医師に対する新・顎咬合学推進講座

著者: 河原英雄石坂芳男油井香代子秋元秀俊山形徳光夏見良宏増田純一上濱正 Henry H Takei Perry R Klokkevold 林崇民 Anthony Rowley 河津寬渡辺隆史
出版者: 特定非営利活動法人日本顎咬合学会
雑誌: 日本顎咬合学会誌咬み合わせの科学 (ISSN:13468111)
巻号頁・発行日: vol.35, no.3, pp.249-258, 2015

ディスカッションに先立って河原先生は,多くの患者に生き甲斐のある暮らしを提供することを目的に,「嚙むことの大切さ」を掲げ,治療時には特に義歯の新製を行わず義歯を調節する,それも和食を箸にて食べる文化を尊重し, Balanced occulusion で前歯で咬める咬合を付与すると説明した.調整前後のビデオでは義歯が調整されるだけで,患者の人としての行動に改善が見られ,目が開き,話し,笑い,歩き,歌を唄った.エビデンスは確立していないが咬合の回復によって運動能力の活性化や認知症の改善をもたらす.「転ばぬ先の杖」元気なうちに義歯を作りそれをうまく使いこなすことが大切であると説明.まさに歯科医療は暮らしを支える医療となったと提言された.増田先生から長寿社会を生き抜くためには,まず「健口」な子どもの口腔を作る必要があることが説明された.具体的には,3 歳までに咬合の基本と土台を習得し,う蝕はゼロ,4 ~5 歳までこれを維持,第一大臼歯の萌出が始まったら,3 ~4 年間う蝕に罹患させない.そして,下顎位を完成させる.その後1 年くらいで側方歯が萌出して永久歯に生え変わり,12 歳でう蝕なしを達成する.このようにして,健全な永久歯と咬み合わせを持った「健口」な状態で人生の旅立ちができるようになると提唱. それらの説明を受けて上濱理事長は「口の健康が元気に生きる源である.嚙んで食べて消化吸収して,元気な体を作ることは生涯の宝である」とし,前述の二方の先生の話を生理学的根拠からまとめた.的確な咀嚼で刺激が脳に伝えられ,脳血流も増加する.また,唾液とよく混和された食物は適切に消化管で分解・吸収され,全身の源となる.子どもに対しては,母乳で育て,正しい方法・バランスで離乳食を食べさせ,しっかり嚙ませてう蝕にしないこと.幼児期に自然の味覚を覚えることも生涯において宝である.成人期は口腔内の疾患を早期に治療し,よく嚙ませる.高齢期は残存歯を維持する,口腔を清潔にする,入れ歯でよく嚙める環境を維持する.これによって健康な頭と体を取り戻す.たとえ脳血管障害,認知症などの患者でも,徐々に嚙み応えのある食事を応用した「食事による総義歯リハビリテーション」を行おうと提言した. これらの学会活動は学会内・外問わず注目され,メディアからの取材をはじめ外人記者クラブによる記者会見は記憶に新しい.今回のディスカッションではこれらの講演を元に変わりゆく日本の歯科医療について語っていただいた.

2021-11-16 08:45:05
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