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The Effect Of Different Protective Coatings On The Surface
Hardness Of Glass Ionomer Cements
Laila A. Saleh, DDS, MSD, Moustafa F. Khaiil, BDS, MS, PhD
College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
Class ionomer cements are liable to hydration and dehydration during their initial set. The use of a light-activated bonding resin is advocated as a protective method of limiting water movement across the surface. This study tested the effect of five coating materials on the surface hardness of Ketac-Fil restorative glass ionomer. Cocoa butter (CB), Ketac varnish (KV), clear finger nail polish (NP), copalite varnish (CV), and a light-cured unfilled resin (UFR) were evaluated. The surface hardness of each group was determined at 1 hour, 24 hours and 1 week, and compared to that of unprotected surface as a control (C). The results showed none of the tested coatings was able to maintain the original surface hardness of the unprotected cement. CB, KV and NP were less effective in reducing the surface hardness of Ketac-Fil than CV and UFR.
Saudi Dental Journal 1994;6(1):3-7.
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