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Materials 2017, 10(1), 27; doi:10.3390/ma10010027

Influence of Porous Spherical-Shaped Hydroxyapatite on Mechanical Strength and Bioactive Function of Conventional Glass Ionomer Cement

1
Department of Pediatric Dentistry, Graduate School of Dentistry, Osaka Dental University, 8-1, Kuzuhahanazono-cho, Hirakata, 573-1121 Osaka, Japan
2
Department of Pediatric Dentistry, Osaka Dental University, 1-5-17, Otemae, Chuo-ku, 540-0008 Osaka, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 29 November 2016 / Revised: 23 December 2016 / Accepted: 26 December 2016 / Published: 3 January 2017
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Abstract

Glass-ionomer-cement (GIC) is helpful in Minimal Intervention Dentistry because it releases fluoride ions and is highly biocompatible. The aim of this study is to investigate the mechanisms by which hydroxyapatite (HAp) improves the mechanical strength and bioactive functioning of GIC when these materials are combined to make apatite ionomer cement (AIC). A conventional GIC powder was mixed with porous, spherical-HAp particles (HApS), crystalline HAp (HAp200) or one of two types of cellulose. The micro-compressive strengths of the additive particles were measured, and various specimens were evaluated with regard to their compressive strengths (CS), fluoride release concentrations (fluoride electrode) and multi-element release concentrations. The AIC was found to release higher concentrations of fluoride (1.2 times) and strontium ions (1.5 times) compared to the control GIC. It was detected the more release of calcium originated from HApS than HAp200 in AIC. The CS of the AIC incorporating an optimum level of HAp was also significantly higher than that of the GIC. These results suggest that adding HAp can increase the release concentration of ions required for remineralization while maintaining the CS of the GIC. This effect does not result from a physical phenomenon, but rather from chemical reactions between the HAp and polyacrylic acid of GIC. View Full-Text
Keywords: glass ionomer cement; improvement; hydroxyapatite; cellulose; compressive strength; fluoride release; mineral release glass ionomer cement; improvement; hydroxyapatite; cellulose; compressive strength; fluoride release; mineral release
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Chiu, S.-Y.; Shinonaga, Y.; Abe, Y.; Harada, K.; Arita, K. Influence of Porous Spherical-Shaped Hydroxyapatite on Mechanical Strength and Bioactive Function of Conventional Glass Ionomer Cement. Materials 2017, 10, 27.

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