アブストラクト(24巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : 咬合性外傷における歯根膜血管網の変化と骨改造との関連について
Subtitle : 原著
Authors : 鳥巣秀男, 高橋和人
Authors(kana) :
Organization : 神奈川歯科大学口腔解剖学教室
Journal : 神奈川歯学
Volume : 24
Number : 2
Page : 358-383
Year/Month : 1989 / 9
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」咬合性外傷(Occlusal trauma)は『咬合歯が直接的, あるいは間接的に作り出すstressによって, 引き起こす歯周組織の外傷』と定義づけられている. すなわち咀嚼筋によってもたらされる過度の咬合圧やインレー, クラウン, 義歯などの適合不良によって歯周組織に生じる病的変化を意味している. 歯周組織の炎症, 外傷性変化を研究するとき, 歯周組織の微小循環の変化と骨のremodellingとの関係を知ることは, 歯周疾患の病因を追求する上で最も重要な課題の一つである. しかしながら咬合性外傷を歯根膜の血管網を中心として観察した研究は少ない. 歯根膜中の線維のturn overの時間は, 他の組織の線維のそれに比べ極めて短いと言われる. また歯根膜と隣接しているセメント質は, 一生涯を通じて形成され続ける. さらに歯槽骨も常にremodellingを受けている. このように歯根膜は極めて代謝活性が高いことが特徴である.
Practice : 歯科学
Keywords : 咬合性外傷, 骨改造, 血管鋳型法

English

Title : Changes of Periodontal Vasculature and Alveolar Bone on the Occlusal Trauma.
Subtitle : Original article
Authors : Hideo TORISU, Kazuto Takahashi
Authors(kana) :
Organization : Department of Oral Anatomy, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 2
Page : 358-383
Year/Month : 1989 / 9
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : Of the researches on periodontal diseases, the changes occurred in the vasculature of periodontal membrane and the surrounding alveolar bone there-to-fore attracts much attention. In order to induce an experimental occlusal trauma, composite resin was added on the occlusal surfaces of mandibular second and third premolars of dogs to raise the bite for a period of time, followed by injection of methacrylate resin (MERCOX) into inferior alveolar artery and dissolution of soft tissues by protainase and examined under the scanning electlon microscope (SEM, JEOL 35C). The results are as follows : After 14 days, a wide range of avascularized area was observed on resin cast of periodontal membrane, The surface of alveolar bone on which the vasculature disappeared did not show resorption process. However, the surface of alveolar bone next to the periodontal vasculature showed undergoing a direct bone resorption. Afrer 30 days, the vasculature of periodontal membrane undrant a morphological change and turned out to appear as a mesh-like vascular network. Certain avascularized regions was observed over the alveolar bone on margin region and cervical region, and it was circumscribed by a vasculature with glomerule-like loops. This vasculature was suspected originating from underlying alveolar bone marrow and connected with the residual vasculature of periodontal membrane. After 60 days, vasculature of periodontal membrane facing teeth appeared quite resemblance with that of health periodontal membrane. Those next to the alveolar bone, however, showed enlargement. In this period, avagcularized area was not observed. After 90 days, the vasculature in periodontal membrane lost its original two-layered arrangement and replaced by the irregular arrayed bundle-like vasculature. Longitudinally arrayed mesh like vasculature was observed in certain region of periodontal vasculature. After 180 days, bundle-like vessels arrayed as an ellipse pattern. Also, resorption process could be observed on the surface of alveolar bone and interradicular septum. Experimental study of occlusal trauma on dentition clearly indicated that teeth were showed a mobility in vertical direction and that the vasculature of periodontal membrane were showed depression and elongation for a period of time. It could not show an apposition where were showed by the experimental depression and elongation, so it was only showed the expansible periodontal membrane space by resorption of alveolar bone.
Practice : Dentistry
Keywords :