Comprehensive Study on Color Changes of Glass-ionomer Cement Family Dental Materials

玻璃离子水门汀系列牙科材料颜色变化的综合研究

• 批准号: 14571820
• 负责人: KAWASHIMA Toshihiro
• 金额: $ 1.41万
• 依托单位: Iwate Medical University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571820/
• 关键词: glass ionomer cement; color; color difference; water sorption; rheometer; electrical resistance; dental material; 重量変化; 歯科用セメント; 色調; 圧縮強さ

The color change of the glass ionomer cement Is time-dependent. However, there were few research reported the mechanism of the color change of the glass ionomer cement. The purpose of this study was to Investigate the physicochemical changes of glass ionomer cement concerning color change. The period of this study was divided into 3 groups; an hour, a month and a year. There was no relevance between the color change and the value of amplitude by means of rheometer in an hour. Then, the amount of change of color difference between every minute was calculated from the values of CIEIAB system. This study indicated the possibility of the relevance between amount of change of color difference and value of the amplitude. There was the high correlation between color change and change of amount of water sorption of the glass ionomer cement in a month. There was hardly the color change In a year from a month, also there was hardly the change of amount of water sorption of the cement. However, it seemed to have to pass through over about 6 months to become stable of the color.Though the resin modified glass ionomer cement used for the comparison showed the slight color change during 1 month, there was hardly the color change for 1 year. However, amount of water sorption of the resin modified glass ionomer cement was larger than other materials used in this study, and It was about 5% as a weight ratio for 1 year. In case of the resin modified glass ionomer cement, there was no relevance between color change and amount of water sorption. In the composite resin used as a control, the color change and the amount of water sorption were smaller than glass ionomer cement.

玻璃离子水门汀的颜色变化与时间有关。然而，关于玻璃离子水门汀变色机理的研究却很少。本研究的目的是研究玻璃离子水门汀与颜色变化相关的物理化学变化。本研究的时期分为3组；一小时、一个月和一年。一个小时内的颜色变化与流变仪测得的振幅值之间没有相关性。然后，根据CIEIAB系统的值计算每分钟之间的色差变化量。这项研究表明了色差变化量与振幅值之间相关性的可能性。玻璃离子水门汀一个月内的颜色变化与吸水量变化存在高度相关性。从一个月到一年，几乎没有颜色变化，水泥的吸水量也几乎没有变化。然而，似乎需要经过大约6个月的时间才能使颜色稳定。虽然用于比较的树脂改性玻璃离聚物水门汀在1个月期间显示出轻微的颜色变化，但在1年内几乎没有颜色变化。然而，树脂改性玻璃离聚物水门汀的吸水量比本研究中使用的其他材料大，并且按重量比计算1年约为5%。对于树脂改性玻璃离聚物水门汀，颜色变化和吸水量之间不存在相关性。在用作对照的复合树脂中，颜色变化和吸水量小于玻璃离子水门汀。