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Journal of Dental Research
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The Glass-ionomer Phase in Resin-based Restorative Materials

F.R. Tay

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 SpectrumTPH 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

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Journal of Dental Research, Vol. 80, No. 9, 1808-1812 (2001)
DOI: 10.1177/00220345010800090701
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This Article
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What's this?