Tingey Mark C, Bush Peter, Levine Ming Shih
Department of Periodontics and Endodontics, School of Dental Medicine, SUNY at Buffalo, Buffalo, NY 14214, USA.
J Endod. 2008 Jan;34(1):45-9. doi: 10.1016/j.joen.2007.09.013. Epub 2007 Nov 26.
Understanding the chemical and physical characteristics of set mineral trioxide aggregate (MTA) surface can provide insight into its bioactivity. The purpose of this study was to describe the surface chemistry and morphology of gray and white MTA set in the presence of fetal bovine serum (FBS). Eight MTA blocks were prepared: four set in the presence of water and four in FBS. The surface morphologic characteristics were studied via scanning electron microscopy. The surface chemical composition of the set cement was investigated by energy dispersive x-ray spectroscopy and x-ray fluorescence. No difference was found between gray and white MTA when set in the same solution. However, MTA/FBS and MTA/water present differing surface morphology and chemical distributions. When set in FBS, MTA's surface had a homogenous distribution of chemicals and a relatively smooth globular appearance. MTA/water's surface was biphasic, containing large hexagonal crystalline plates composed of calcium embedded in a pool of globular crystals.
了解凝固后的矿物三氧化物凝聚体（MTA）表面的化学和物理特性有助于洞察其生物活性。本研究的目的是描述在胎牛血清（FBS）存在的情况下凝固的灰色和白色MTA的表面化学性质和形态。制备了八个MTA块：四个在水存在的情况下凝固，四个在FBS中凝固。通过扫描电子显微镜研究表面形态特征。通过能量色散X射线光谱和X射线荧光研究凝固后的水泥的表面化学成分。当在相同溶液中凝固时，灰色和白色MTA之间未发现差异。然而，MTA/FBS和MTA/水呈现出不同的表面形态和化学分布。当在FBS中凝固时，MTA的表面具有均匀的化学分布和相对光滑的球状外观。MTA/水的表面是双相的，包含由嵌入球状晶体池中的钙组成的大的六边形晶体板。
