| dc.description.abstract | A series of experiments were performed to understand the ionic processes in glass
ionomer cements.
Fluoride release from fluoroaluminosilicate glasses in deionised water and artificial
saliva
Inorganic artificial saliva was used to compare the release of fluoride from four fluoroaluminosilicate
glasses (AH2. LG26Sr, LG125 and LG26). The glasses were used in
their raw form and as an acid washed glass and pseudocement. Results showed two
different trends. AH2 released more fluoride in artificial saliva relative to deionised
water and the LG glasses released less in artificial saliva relative to deionised water.
Kinetics of fluoride release from glass ionomer cements: influence of ultrasound and
radiant heat
Two conventional GIC’s Fuji IX and Ketac Molar were used, along with commercial
GIC’s Amalgomer, Amalgomer CR and Glass Carbomer which was also radiant heat
set. The experimental glass used was LG30 which is a fluoride free glass and was mixed
at 7:1 ratio with 2% NaF solution. It was observed that ultrasound increases the release
of fluoride whereas radiant heat reduces the release of fluoride.
Investigation into secondary setting mechanism of glass ionomer cement: hydrolytic
stability of aluminiosilicate-acetic acid cements
Six glasses were used LG26, LG30, LG117, Anorthite, Na-Anorthite. Glasses were
mixed with acetic acid and made into discs. These were matured for 1, 2, 3, 6 and 24
hours then immersed in 40ml of deionised water. After 24hours they were assessed for
visual disintegration using a scale developed for this purpose. It was noted that MP4
never formed stable cement; LG26, LG117, Anorthite and Na-anorthite immediately
formed a stable cement whereas LG30 formed a stable cement only after 24hours.
Inductively Coupled Plasma analysis on the release of ions showed that Al was released
in quantities comparable to glass-polyalkenoate cements hence suggesting that acetate
cements are actually Al-acetate type cements. | |
