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The Glass-ionomer Phase in Resin-based Restorative Materials

Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China, kfctay{at}hknet.com

E.L. Pashley

Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA

C. Huang

College and Hospital of Stomatology, Wuhan University, Wuhan, China

M. Hashimoto

Department of Operative Dentistry and Endodontics, School of Dentistry, Iwate Medical University, 1-3-27 Chuoudouri, Morioka, Iwate 020-8505, Japan

H. Sano

Department of Pediatric Dentistry, Hokkaido University School of Dentistry, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan

R.J. Smales

Dental School, Adelaide University, South Australia 5005

D.H. Pashley

Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA

Glass-ionomer (GI) fillers are added to restorative materials, but it is unclear if they truly react with these materials. This TEM study evaluated the existence of the GI phase in a conventional GIC (ChemFlex), a resin-modified GIC (Fuji II LC), a giomer (Reactmer Paste), a compomer (Dyract AP), and a composite (Spectrum ^TPH), before and after water uptake. Wafers were stored at 100% RH for 24 hrs, or in water for 7 or 84 days. ChemFlex glass particles were surrounded by 300-nm-thick silica gel layers. In Fuji II LC, we found thinner hydrogel layers (100 nm) that became thicker upon water storage. No appreciable change occurred in Reactmer Paste. Only a very thin hydrogel layer occurred in Dyract AP, and none was seen in Spectrum^TPH after water storage for 84 days. We conclude that the variable extent of the GI phase is determined by differences in the resin composition of the restoratives.

Key Words: glass ionomer • hydrogel • resin matrix

Journal of Dental Research, Vol. 80, No. 9, 1808-1812 (2001)
DOI: 10.1177/00220345010800090701


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