合成樹脂齲蝕予防填塞材のガラスフィラー添加に関する研究
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概要
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The purpose of this study is to elongate the effective period of the caries preventive sealing material chiefly consisting of Ethyl-2-cyanoacrylate (liquid) and Poly-methylmethacrylate (powder) developed by Takeuchi and others. Experimental materials were prepared by mixing the above-mentioned powder with varying kinds and amounts of glass filler, such as non-treated glass filler (borosilicate-glass powder), five kinds of silane-treated glass filler prepared by coating the surface of borosilicate glass powder with varying kinds of silane, and glass fillers prepared by treating first with Silane A-174 and then by solution-, suspension-, or bulk-polymerization with Methylmethacrylate (MMA). The effects of the addition of these glass fillers on the abrasion resistance, Micro Brinell hardness, compressive strength and water absorption of the sealing material were investigated, with results as follows.<BR>1. The abrasion resistance, Micro Brinell hardness and water absorption of the sealing material containing non-treated glass filler were improved with the increase in the amount of glass filler.<BR>2. In the sealing materials containing varying kinds of silane-treated glass fillers, the effect of the kind of silane on their physical properties was the highest in Silane A-187. Compared to the sealing material containing no glass filler, the sealing material containing 70wt% of glass filler treated with Silane A-187 showed approximately five times higher abrasion resistance, as well as improvements in the compressive strength, Micro Brinell hardness and water absorption.<BR>3. In the sealing materials containing glass filler treated with Silane A-187 or Silane A-174, the effect of the concentration of silane treatment on their physical properties was approximately the same within the range of 0.05-1.0vol%.<BR>4. In the sealing materials containing the glass filler treated with Silane A-187 or Silane A-174, the effect of the quantity of the glass filler on the physical properties was that in both cases all physical properties were improved with the increase in the amount of glass filler.<BR>5. The effect of the method of polymerization of glass filler on the physical properties of the sealing material was investigated in the sealing materials containing the glass filler which was polymerized with MMA by varying methods after being treated with Silane A-174, with the result that solution-poly-merization was the best among the three methods.<BR>6. Compared to the sealing material containing no glass filler, the one containing 70wt% of the glass filler which was treated by solution-polymerization with MMA after being treated with Silane A-174 showed abrasion resistance approximately six times higher than that of the control, as well as improvements in Micro Brinell hardness and compressive strength, and remarkable decrease in water absorption.<BR>Furthermore, comparing to the self-curing resin containing no glass filler, its values showed remarkable improvements in the abrasion resistance, Micro Brinell hardness and water absorption, and were similar to the abrasion resistance and water absorption of the self-curing resin containing 70wt% of Silane A-174-treated glass filler.
- 有限責任中間法人 日本口腔衛生学会の論文