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- Title
Interaction of Glass-ionomer Cements with Moist Dentin.
- Authors
Yiu, C. K. Y.; Tay, F. R.; King, N. M.; Pashley, D. H.; Sidhu, S. K.; Neo, J. C. L.; Toledano, M.; Wong, S. L.
- Abstract
Glass-ionomer cements (GICs) are regarded as aqueous gels made up of polyalkenoic acid salts containing ion-leachable glass fillers. The consequence of water permeation across the GIC-dentin interface is unknown. This study used SEM, field-emission/environmental SEM (FE-ESEM), and TEM to examine the ultrastructure of GIC-bonded moist dentin. Dentin surfaces bonded with 6 auto-cured GICs were examined along the fractured GIC-dentin interfaces. Additional specimens fractured 3 mm away from the interfaces were used as controls. SEM revealed spherical bodies along GIC-dentin interfaces that resembled hollow eggshells. FE-SEM depicted similar bodies with additional solid cores. Energy-dispersive x-ray analysis and TEM showed that the spherical bodies consisted of a silicon-rich GIC phase that was absent from the air-voids in the controls. The GIC inclusions near dentin surfaces result from a continuation of the GI reaction, within air-voids of the original polyalkenoate matrix, that occurred upon water diffusion from moist dentin.
- Subjects
DENTAL glass ionomer cements; DENTIN; DIFFUSION; SCANNING electron microscopy; TRANSMISSION electron microscopy; X-ray spectroscopy
- Publication
Journal of Dental Research, 2004, Vol 83, Issue 4, p283
- ISSN
0022-0345
- Publication type
Article
- DOI
10.1177/154405910408300403