MTA、BioAggregate、Biodentineのシミュレーション条件での物理的特性。マイクロCTを用いた分析

Physical properties of MTA, BioAggregate and Biodentine in simulated conditions: A micro-CT analysis.

抄録

本研究の目的は，マイクロCTを用いて，異なるpHおよび血液条件における後戻り性充填物としてのケイ酸カルシウム系セメントの物性を評価することである．84本の歯を咬合させ，歯根端切除後，深さ3mmの歯根端空洞を超音波で作製した．試料は4つの試験群（n=21）に分けた。セメントは新鮮な状態で調製し，曝露前と曝露後にmicro-CTで分析した．試験群は，酸，アルカリ，血液を含む環境に4日間暴露された。酸性のpHでは，4日後にすべての材料の体積が有意に減少し，他の環境との違いが見られた。バイオデンチンは、酸性の環境で処理した後の体積と密度の減少率が最も高い。酸性媒体中での多孔質形成は、すべての材料の中でバイオデンチンに見られた。また、酸性のpHで処理した場合、すべての材料で立体構造が変化したが、血液やアルカリで処理した材料では構造の変化が少なかった。

The aim of this study was to evaluate the physical properties of calcium-silicate based cements as retrograde filling in different pH and blood conditions using micro-CT. Eighty-four teeth were obturated and after root-end resection, 3 mm-deep root-end cavity was ultrasonically prepared. The samples were divided into four test groups (n=21). Cements were freshly prepared and analyzed with micro-CT before and after exposed. The test groups were exposed for four days to environments containing acid, alkali, or blood. An acidic pH significantly reduced the volume of all materials after four days and differed from the other environments. Biodentine has the highest percentage of loss in volume and density after treatment in an acidic environment. Porosity formation in the acidic medium was observed in Biodentine amongst all materials. The three-dimensional structures of all materials changed after exposed to an acidic pH, while fewer changes were observed in the structures of materials treated with blood and alkali.