アブストラクト(19巻4号:神奈川歯学)

神奈川歯学

Japanese

Title : 歯の奇形の組織学的研究 II 過剰根歯の発現機構の考察
Subtitle : 原著
Authors : 坪田不二雄
Authors(kana) :
Organization : 神奈川歯科大学口腔組織学教室
Journal : 神奈川歯学
Volume : 19
Number : 4
Page : 360-375
Year/Month : 1985 / 3
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「まえがき」永久歯の過剰根の発現頻度は下顎第1大臼歯では20% (藤田), その他の歯種ではそれぞれ0.5% (尾崎) である. 永久犬歯の複根例の肉眼解剖学的報告はHillebrand, Visser, 中村ら, 内藤, Alexandersen, Wedl, Wetzel, 藤田, 岡本ら, 井本ら, 森永, 難波ら, 上野らによって, 上顎側切歯の複根例は伊藤ら, 下顎側切歯のそれは清水・音田, 小臼歯の過剰根例は佐々木, 下総, 藤田ら, 川崎ら, 丸山, 伊藤・野坂, 多田らなどによって非常に多数ある. しかしながら, 過剰歯根の組織学的研究報告はほとんどない. 正常の複根歯の髄床象牙質と根分岐のでき方については学説が対立している. 一説によれば根分岐部の象牙質を作るために上皮性根間突起 (ヘルトウィヒ上皮鞘の先端部) が癒合する (Walkoff, Lartschneider, 藤田).
Practice : 歯科学
Keywords :

English

Title : A Histological Study of Dental Malformation : II. A Consideration on the Mechanism of Supernumerary Root Formation
Subtitle :
Authors : Fujio TSUBOTA
Authors(kana) :
Organization : Department of Oral Histology, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 19
Number : 4
Page : 360-375
Year/Month : 1985 / 3
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : For a histologic study of abnormally furcated tooth roots ten two-rooted mandibular canines were used, whereas for study of normally furcated tooth roots 138 primary molars, i. e. 70 upper and 68 lower molars, and 10 permanent molars, i. e. 5 upper and lower molars respectively, were used. Between normal and abnormal ones, the fundamental template formation of interdental epithelial processes for root furcation was almost the same. However, the histological abnormalities in dentin and enamel which were associated with cell debris were more frequently occurred in the abnormally rooted teeth compared with the normally rooted ones. These pathologic features were usually observed in the hard tissues which were formed before the root formation began. Therefore, it seems that supernumerary root formation depends upon the the supernumerary developing centers of the pulp which have formed in relation to a degenerated state of interdental epithelial processes.
Practice : Dentistry
Keywords :