Journal of Dental Research, Vol 70, 75-78, Copyright © 1991 by International & American Associations for Dental Research Online Journals
In vitro fluoride release from a light-cured glass-ionomer liner/base
S. B. Mitra
3M Center, St. Paul, Minnesota 55144.
This paper reports the results of an in vitro study of fluoride release
from Vitrabond Light-Cure Glass Ionomer Liner/Base. The material released
fluoride ions into the surrounding medium for up to 740 days. The rate of
release of fluoride ions was independent of the cure time in the range
studied. Combining a conventional polyalkenoic acid solution with the
powder portion of Vitrabond Liner/Base did not significantly alter the
release profile, thus indicating that light curing did not hinder the rate
of fluoride release in this system. Secondary ion mass spectrometry studies
of the dentin underlying the cured glass ionomer revealed that there was
considerable incorporation of fluoride ions. There was no significant
change in the mechanical properties of the cured cement aged in water at 37
degrees C for prolonged periods, thus indicating that long-term fluoride
release did not adversely affect the strength of this material.
