アブストラクト(26巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : コンポジット・レジン材料の細胞生化学的研究 : Triethylene Glycol Dimethacrylate (TEGDMA) 骨芽細胞の増殖と分化への影響
Subtitle : 原著
Authors : 須田正文1), 川瀬俊夫2), 岩本次男1), 斎藤滋2)
Authors(kana) :
Organization : 1)神奈川歯科大学歯科保存学教室第一講座, 2)神奈川歯科大学口腔生化学教室
Journal : 神奈川歯学
Volume : 26
Number : 1
Page : 11-24
Year/Month : 1991 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 コンポジットレジンは前歯の審美修復材として臨床で用いられて以来4半世紀を経, その間, 材料ならびに接着剤の改良, 開発等によりその適応範囲は飛躍的に拡大され, 近年では臼歯咬合面に存在する実質欠損の修復にも適用されており, 今日の歯科臨床における審美修復には欠くことのできない材料の1つとしてその地位を確立するに至っている. このようにコンポジットレジンは審美性, 操作性, 歯質接着性などの面から優れた性質を有している反面, 歯髄刺激性, 辺縁着色や耐摩耗性などさまざまな臨床的欠陥が指摘されている. 歯髄刺激性に関しては従来より, 窩洞形成時の刺激や, エッチング時の刺激, 辺縁漏洩による唾液や細菌浸入, コンポジット重合体中の残留モノマー等が複雑に相乗して発現すると考えられている. これら歯髄刺激の原因の中でコンポジットレジン重合体中の残留モノマーに関しては, コンポジットレジンの臨床応用当初, アクリリックレジンに比較して基質であるレジン量が相対的に少ないため, 歯髄刺激性は低いと考えられ, 裏層などの歯髄保護対策は必要が無いと思われていた.
Practice : 歯科学
Keywords : レジンモノマー, 骨芽細胞, ALPase

English

Title : Cytobiochemical Study of Composite Resine : Effect of Triethylene Glycol Dimethacrylate (TEGDMA) on the Growth and Differentiation of Osteoblasts.
Subtitle :
Authors : Masafumi SUDA1), Toshio KAWASE2), Tsugio Iwamoto1), Shigeru Saito2)
Authors(kana) :
Organization : 1)Department of Restorative Dentistry, Kanagawa Dental College, 2)Department of Oral Biochemistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 26
Number : 1
Page : 11-24
Year/Month : 1991 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : [Abstract] The present study was attempted to explore the effect of triethylene glycol dimethacrylate (TEGDMA) on the cell growth and differentiation of rat calvarial osteoblast-like cells. An osteoblast-enriched cell population isolated from 2 day-old rat calvaria by sequential enzymatic digestion was cultured in modified BGJ medium supplemented with fetal calf serum protein (2mg/ml) and antibiotics. After osteoblast-like cells were inoculated and cultured for 24 hr, TEGDMA dissolved in ethanol was added in culture medium. At 2,3 and 4 days, the protein contents of cell layer which were assayed by a Coomassie Brilliant blue method were detected as a cell growth of osteoblast-like cells. And, alkaline phosphatase (ALPase) of a osteoblastic differentiational marker was determined by a method using p-nitrophenylphosphate. On the other hand, cells exposed with 0.25mM TEGDMA or vehicle for 3 days were labeled with succinate-1,4-14C, 14C-proline and 32Pi (Na2H32PO4), respectively for 24 hrs. The TCA precipitates of the medium dissolved and counted radioactivity and 14C and 32P. And also, radioactivity incorporated in the cell layers was determined. The osteoblast-like cells exposed with TEGDMA dramatically decreased the cell growth. At day 4 cultivation, LD50 was observed with 0.7mM of TEGDMA. On the other hand, ALPase activity of TEGDMA resistant osteoblast-like cells was stimulated 4.87+-0.74 fold compared with control. Though the protein biosynthesis observed by the incorporation of 14C-prolinc was not affected by TEGDMA, the incorporation of succinate-1,4-14C into macromolecules was increased. Also, the stimulation of phosphorylation of macromolecules which was labeled with 32Pi in the medium was observed. These results indicate that TEGDMA may stimulate the post-translational modification of glycosylation and phosphorylation in the protein biosynthesis. Therefore, TEGDMA may have the potential for chemical toxicity to the osteoblast-like cells. However, TEGDMA could modulate the differentiation of the ALPase positive osteoblast-like cells.
Practice : Dentistry
Keywords : ALPase