Ion Capture and Release Ability of Glass Ionomer Cement Containing Nanoporous Silica Particles with Different Pore and Particle Size oleh Ryoshun Endo, Ko Nakanishi, Yosuke Bando, Shigeaki Abe, Haruhi Maruoka, Mariko Nakamura, Tsukasa Akasaka, Yasuhiro Yoshida, Yoshiaki Sato