Effect of immersion time of restorative glass ionomer cements and immersion duration in calcium chloride solution on surface hardness
Effect of immersion time of restorative glass ionomer cements and immersion duration in calcium chloride solution on surface hardness
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DOI：
10.1016/j.dental.2014.08.366
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发表时间：
2014-12-01
期刊：
影响因子：
5
通讯作者：
Uo, Motohiro
中科院分区：
文献类型：
--
作者：
Shiozawa, Maho;Takahashi, Hidekazu;Uo, Motohiro
目标.本研究的目的是评估修复玻璃离子水门汀（GIC）的浸泡时间和浸泡在氯化钙（CaCl 2）溶液中的时间对表面硬度的影响。选择了两种高粘度GIC，富士IX GP和富士FX-II。48例标本随机分为两组。混合60分钟后，将其中一半浸入42.7wt%CaCl2溶液中10、30或60分钟（第1组）;剩余样本在另外储存1周后浸入（第2组）。测量试样的表面硬度，并采用双因素方差分析和Tukey HSD检验（α = 0.05）进行分析。用X射线能谱仪和X射线光电子能谱仪对表面成分进行了分析。第1组的表面硬度显着增加，随着浸泡时间的增加，在氯化钙;第2组显着增加后，60分钟的氯化钙浸泡。CaCl 2浸泡后，随着浸泡时间的延长，Ca的含量增加。CaCl 2浸泡后的表面硬度与组1中的Ca量显著相关，但在组2中不相关。Ca 2 p峰的结合能与聚烯烃酸钙的结合能相似。这些结果表明，来自CaCl 2溶液的Ca离子与骨水泥基质中的羧酸基团形成化学键。GICs在凝固初期浸泡在CaCl 2溶液中被认为是促进了多酸盐基质的形成，因此，表面硬度增加。(C)2014年由Elsevier Ltd代表牙科材料学会发布。All rights reserved.
Objectives. The objective of this study was to evaluate the effect of immersion time of restorative glass ionomer cements (GICs) and immersion duration in calcium chloride (CaCl2) solution on the surface hardness.Methods. Two high-viscosity GICs, Fuji IX GP and GlasIonomer FX-II, were selected. Forty-eight specimens were randomly divided into two groups. Sixty minutes after being mixed, half of them were immersed in a 42.7 wt% CaCl2 solution for 10, 30, or 60 min (Group 1); the remaining specimens were immersed after an additional 1-week of storage (Group 2). The surface hardness of the specimens was measured and analyzed with two-way ANOVA and the Tukey HSD test (alpha = 0.05). The surface compositions were examined using energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy.Results. The surface hardness of Group 1 significantly increased as the immersion duration in CaCl2 increased; that of Group 2 significantly increased only after 60-minute CaCl2 immersion. After CaCl2 immersion, the amounts of Ca increased as the immersion duration increased. The surface hardness after CaCl2 immersion significantly correlated with the amount of Ca in Group 1, but not in Group 2. The binding energy of the Ca2p peak was similar to that of calcium polyalkenoate. These findings indicated that the Ca ions from the CaCl2 solution created chemical bonds with the carboxylic acid groups in the cement matrix.Significance. Immersion of GICs in CaCl2 solution at the early stage of setting was considered to enhance the formation of the polyacid salt matrix; as a result, the surface hardness increased. (C) 2014 Published by Elsevier Ltd on behalf of Academy of Dental Materials. All rights reserved.