Spheroidization of glass powders for glass ionomer cements

被引：25
作者：
Gu, YW
Yap, AUJ
Cheang, P
Kumar, R
机构：
[1] Nanyang Technol Univ, Sch Mat Engn, Singapore 639798, Singapore
[2] Singapore Inst Mfg Technol, Singapore 638075, Singapore
[3] Natl Univ Singapore, Fac Dent, Dept Restorat Dent, Singapore 119074, Singapore
来源：
BIOMATERIALS | 2004年 / 25卷 / 18期
关键词：
glass ionomer cements; spheroidization; RF plasma spraying; flame spraying; mechanical property;
D O I：
10.1016/j.biomaterials.2003.10.096
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
Commercial angular glass powders were spheroidized using both the flame spraying and inductively coupled radio frequency plasma spraying techniques. Spherical powders with different particle size distributions were obtained after spheroidization. The effects of spherical glass powders on the mechanical properties of glass ionomer cements (GICs) were investigated. Results showed that the particle size distribution of the glass powders had a significant influence on the mechanical properties of GICs. Powders with a bimodal particle size distribution ensured a high packing density of glass ionomer cements, giving relatively high mechanical properties of GICs. GICs prepared by flame-spheroidized powders showed low strength values due to the loss of fine particles during flame spraying, leading to a low packing density and few metal ions reacting with polyacrylic acid to form cross-linking. GICs prepared by the nano-sized powders showed low strength because of the low bulk density of the nano-sized powders and hence low powder/liquid ratio of GICs. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4029 / 4035
页数：7
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