Glass ionomer cements: Effect of strontium substitution on esthetics, radiopacity and fluoride release
Glass ionomer cements: Effect of strontium substitution on esthetics, radiopacity and fluoride release
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DOI：
10.1016/j.dental.2013.12.003
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发表时间：
2014-03-01
期刊：
影响因子：
5
通讯作者：
Anderson, P.
中科院分区：
文献类型：
--
作者：
Shahid, S.;Hassan, U.;Anderson, P.
目标。SrO和SrF2被广泛用于取代离子玻璃中的CaO和CaF2来生产不透射线的玻璃离子水泥（GIG）。本研究的目的是评估这种取代对GIG离子释放的影响，以及它对美学（半透明）和不透光性的影响。材料和方法。水泥由含有不同Sr、Ca和F含量的离子玻璃制成。水泥在37摄氏度的稀乙酸（pH 4.0）中储存7天。之后，将水泥除去，测试溶液中F-、Sr2+、Ca2+和Al3+的释放。根据BS EN ISO 9917-1:2003测量不透明度和半透明度。离子释放与t（1/2）呈线性关系，表明这是一个扩散控制机制，而不是溶解控制机制。当部分或全部钙被锶取代时，氟化物从水泥中释放出来。放射性不透明度与Sr含量呈较强的线性相关。所有水泥都比C-0.70 0.55标准不透明，但比C-0.70 0.90标准不透明，这是ISO验收要求的极限。这项研究表明，在玻璃离子玻璃中用锶代替钙会增加水泥的透射线性，而不会对水泥的视觉性能产生不利影响。当部分或全部钙被锶取代时，氟化物从水泥中释放出来。(C) 2013年牙科材料学会。Elsevier Ltd.出版。版权所有。
Objective. SrO and SrF2 are widely used to replace CaO and CaF2 in ionomer glasses to produce radiopaque glass ionomer cements (GIG). The purpose of this study was to evaluate the effects of this substitution on release of ions from GIG as well as its effect on esthetics (translucency) and radiopacity.Materials and methods. Cements were produced from ionomer glasses with varying content of Sr, Ca and F. The cements were stored in dilute acetic acid (pH 4.0) for up to 7 days at 37 degrees C. Thereafter, the cements were removed and the solution was tested for F-, Sr2+, Ca2+, and Al3+ release. Radiopacity and translucency were measured according to BS EN ISO 9917-1:2003.Results. Ion release was linear to t(1/2) suggesting that this is a diffusion controlled mechanism rather than dissolution. The fluoride release from the cements is enhanced where some or all calcium is replaced by strontium. Radiopacity shows a strong linear correlation with Sr content. All cements were more opaque than the C-0.70 0.55 standard but less opaque than the C-0.70 0.90 standard which is the limit for the ISO requirement for acceptance.Significance. This study shows that the replacement of calcium by strontium in a glass ionomer glass produces the expected increase in radiopacity of the cement without adverse effects on visual properties of the cement. The fluoride release from the cements is enhanced where some or all calcium is replaced by strontium. (C) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.