Effect of bismuth oxide radioopacifier content on the material properties of an endodontic Portland cement-based (MTA-like) system
Effect of bismuth oxide radioopacifier content on the material properties of an endodontic Portland cement-based (MTA-like) system
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DOI：
10.1016/j.joen.2006.11.018
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发表时间：
2007-03-01
影响因子：
4.2
通讯作者：
Hofmann, Michael P.
中科院分区：
文献类型：
--
作者：
Coomaraswamy, Kristian S.;Lumley, Philip J.;Hofmann, Michael P.
研究了放射性氧化铋（Bi2O3）对根管波特兰水泥基材料性能的影响。Bi2O3含量从0增加到10重量%导致机械强度从82到40 MPa的劣化，在进一步添加到29 MPa的40重量%时逐渐降低。随着Bi_2O_3含量的增加，凝固材料的相对孔隙率也逐渐增加，从15%增加到31%。强的线性相关性，发现增加相对孔隙度，干和支柱密度，和Bi2O3含量的增加。材料常数，如临界缺陷尺寸，被发现与Bi2O3添加急剧改变，并保持不变，进一步增加，从而影响潜在的寿命的牙髓模型系统。还发现该水泥体系在组成和强度上与商业MTA相当，但由于波特兰水泥组分的可加工性更好，因此具有更低的孔隙率。
The effect of bismuth oxide (Bi2O3) radiocipacifier addition on the material properties of an endodontic Portland cement-based system were investigated. Increasing Bi2O3 content from 0 to 10 wt % resulted in a deterioration of mechanical strength from 82 to 40 MPa, decreasing gradually on further addition to 29 MPa for 40 wt %. Bi2O3 content increase also gradually increased the relative porosity of the set material from 15 to 31%. Strong linear correlationships were found for increases in relative porosity, dry and strut densities, and Bi2O3 content increase. Material constants, such as critical flaw size, were found to alter drastically with Bi2O3 addition and remained constant with further increase, thus affecting the potential longevity of the endodontic model system. The cement system was also found to be comparable in composition and strength to commercial MTA but had lower porosity because of the better workability of the Portland cement component.