Shiozawa Maho, Takahashi Hidekazu, Iwasaki Naohiko, Uo Motohiro
Advanced Biomaterials, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University.
Dent Mater J. 2013;32(5):828-33. doi: 10.4012/dmj.2013-143.
The objective of this study was to evaluate the effect of the concentration of calcium chloride (CaCl2) solution on the surface hardness of restorative glass ionomer cements (GICs). Two high-viscosity GICs, Fuji IX GP and GlasIonomer FX-II, were immersed in several concentrations of CaCl2 solution for 1 day and 1 week. The immersed specimen surfaces were evaluated using microhardness testing, grazing incidence X-ray diffraction, and energy-dispersive X-ray spectroscopy. Immersion in a higher concentration of CaCl2 solution produced a greater increase in the surface hardness. No crystalline substance was observed on the immersed surface. Calcium ions were selectively absorbed in the matrix of the GIC surface after immersion. They reacted with the non-reacted carboxylic acid groups remaining in the cement matrix. These reactions were considered to cause an increase in the surface hardness of the GICs.
本研究的目的是评估氯化钙（CaCl₂）溶液浓度对修复性玻璃离子水门汀（GIC）表面硬度的影响。将两种高粘度GIC，即Fuji IX GP和GlasIonomer FX-II，浸泡在几种浓度的CaCl₂溶液中1天和1周。使用显微硬度测试、掠入射X射线衍射和能量色散X射线光谱对浸泡后的试样表面进行评估。浸泡在较高浓度的CaCl₂溶液中会使表面硬度有更大的增加。在浸泡后的表面未观察到结晶物质。浸泡后钙离子被选择性地吸收在GIC表面的基质中。它们与水泥基质中残留的未反应羧酸基团发生反应。这些反应被认为导致了GIC表面硬度的增加。
