Calcium Charge and Release of Conventional Glass-Ionomer Cement Containing Nanoporous Silica

Koichi Nakamura; Shigeaki Abe; Hajime Minamikawa; Yasutaka Yawaka

doi:10.3390/ma11081295

Calcium Charge and Release of Conventional Glass-Ionomer Cement Containing Nanoporous Silica

Materials (Basel). 2018 Jul 27;11(8):1295. doi: 10.3390/ma11081295.

Authors

Koichi Nakamura¹, Shigeaki Abe², Hajime Minamikawa³, Yasutaka Yawaka⁴

Affiliations

¹ Department of Dentistry for Children and Disabled Person, Graduate School of Dental Medicine, Hokkaido University, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. pika@den.hokudai.ac.jp.
² Department of Biomaterials and Bioengineering, Graduate School of Dental Medicine, Hokkaido University, Sapporo 060-8586, Hokkaido, Japan. sabe@den.hokudai.ac.jp.
³ Department of Dentistry for Molecular Cell Pharmacology, Graduate School of Dental Medicine, Hokkaido University, Sapporo 060-8586, Hokkaido, Japan. minami@den.hokudai.ac.jp.
⁴ Department of Dentistry for Children and Disabled Person, Graduate School of Dental Medicine, Hokkaido University, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. yawaka@den.hokudai.ac.jp.

Abstract

The aim of this study was to evaluate calcium charge and release of conventional glass-ionomer cement (GIC) containing nanoporous silica (NPS). Experimental specimens were divided into two groups: the control (GIC containing no NPS) and GIC-NPS (GIC containing 10 wt % NPS). The specimens were immersed in calcium chloride solutions of 5 wt % calcium concentration for 24 h at 37 °C, whereupon the calcium ion release of the specimens was measured. The calcium ion release behavior of GIC-NPS after immersion in the calcium solution was significantly greater than that of the control. Scanning electron microscopy and electron-dispersive X-ray spectroscopy results indicated that calcium penetrated inside the GIC-NPS specimen, while the calcium was primarily localized on the surface of the control specimen. It was demonstrated that NPS markedly improved the calcium charge and release property of GIC.

Keywords: calcium; glass-ionomer cement; nanoporous silica.