Bozeman T Brian, Lemon Ronald R, Eleazer Paul D
J Endod. 2006 May;32(5):425-8. doi: 10.1016/j.joen.2005.08.009. Epub 2006 Feb 17.
Crystal growth and elemental dissolution characteristics of gray Mineral Trioxide Aggregate (GMTA), white MTA (WMTA), and an experimental material, Dentalcrete, were compared. For part A, comparing amount and composition of surface crystal growth, twelve cylinders of each material were suspended in Phosphate Buffered Saline (PBS) solution without Ca. The crystals were analyzed by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Inductively Coupled Plasma--Atomic Emission Spectroscopy (ICP-AES). For part B, three cylinders of each material were suspended in distilled, deionized water. The water was analyzed by ICP-AES for Ca content at 24 h, 72 h, and 5, 7, 10, and 14 days. Data were analyzed using one-way ANOVA and Tukey test. Both MTA materials released more Ca initially, followed by a decline and then rise in elution. GMTA produced the most surface crystal, which may be clinically significant. The crystals on GMTA and WMTA were chemically and structurally similar to hydroxyapatite (HA).
比较了灰色矿物三氧化物凝聚体（GMTA）、白色MTA（WMTA）和一种实验材料Dentalcrete的晶体生长和元素溶解特性。对于A部分，比较表面晶体生长的数量和组成，每种材料取12个圆柱体悬浮于不含钙的磷酸盐缓冲盐水（PBS）溶液中。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和电感耦合等离子体原子发射光谱法（ICP-AES）对晶体进行分析。对于B部分，每种材料取3个圆柱体悬浮于蒸馏去离子水中。在24小时、72小时以及5天、7天、10天和14天时，通过ICP-AES分析水中的钙含量。数据采用单因素方差分析和Tukey检验进行分析。两种MTA材料最初释放的钙更多，随后下降然后上升。GMTA产生的表面晶体最多，这可能具有临床意义。GMTA和WMTA上的晶体在化学和结构上与羟基磷灰石（HA）相似。
