Effect of maturation on the fluoride release of resin-modified glass ionomer and polyacid-modified composite resin cements.
The effect of an early water contact on the fluoride release is studied for the resin-modified glass ionomer cements (RM-GIC) GC Lining LC, PhotacBond, Vitremer and Vitrebond and for the polyacid-modified composite resins (PAM-C) Variglass and Dyract. Six months fluoride release profiles were determined in regularly renewed water (37 degrees C), for the products directly after light curing and after 24 h maturation in a humid atmosphere (85% RH). ANOVA shows that both the short-term and the long-term fluoride release of a RM-GIC are influenced by this maturation. This indicates that direct water contact for this material should be avoided. For the RM-GIC a correlation is found between the initial fluoride release process and the long-term process. For the PAM-C materials, no differences in the fluoride release are found as a function of maturation, indicating that early water contact has no effect. The amounts of fluoride released by PAM-C are low compared to RM-GIC, which can affect their caries preventive potential. The results are explained on the basis of the setting reaction of both types of materials.
Marks
L A
LA
Department of Paediatric Dentistry, University of Gent, Belgium.
Verbeeck
R M
RM
De Maeyer
E A
EA
Martens
L C
LC
D000180:Acrylic Resins / Q000737:chemistry* / Q000528:radiation effects; D020770:Compomers; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D004058:Diffusion; D005459:Fluorides / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry* / Q000528:radiation effects; D006813:Humidity; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry* / Q000528:radiation effects; D010777:Photochemistry; D017640:Silicates / Q000737:chemistry* / Q000528:radiation effects; D012995:Solubility; D013997:Time Factors; D014867:Water
D000180:Acrylic Resins; D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D005899:Glass Ionomer Cements; D008689:Methacrylates; C088835:Photac-Bond; D017640:Silicates; C081982:VariGlass VLC; C084550:Vitremer; D014867:Water; C074319:GC Lining Cement; C067790:Vitrabond; D005459:Fluorides