Rahman, Ismail Ab.
(2015)
Synthesis of nanohydroxypatite-silica hybrid
By in-situ sol-gel for fabrication of glass
lonomer cement (GIC) dental nanocomposites.
Other.
Pusat Pengajian Sains Perubatan, Universiti Sains Malaysia.
Abstract
Glass ionomer cements (GICs) have been widely used as restorative dental materials
due to the biocompatibility property that able to form direct bonding to the tooth structure
and the release of fluoride ions that protect against dental caries and able to regenerate
hard tissues including bones and tooth structure. Among the disadvantages, GICs are
chemically soluble in saliva water environment that need a protective layer of
methacrylate based gloss, the setting reaction affected by water, abrasive, weak in
mechanical properties such as strength and hardness. Thus, it is required to develop
new composition and the studies on the improvement of the mentioned aspects in order
to find a better product for future restorative dental material. Modification of commercial
GICs with hydroxyapatite (HA) stainless steel, zirconia, glass, HNzirconia, HNglass
have been reported in literatures to improve mechanical properties. However, the
improvement on mechanical properties was not significant. In all cases, they used
commercial powders with particle size in micro range. In addition, a fundamental studies
on the effect of powder morphologies and the interaction between additive and GIC that
affect mechanical and chemical and biological properties were not elaborated. In our
knowledge, the work on the addition of HNsilica nanoparticle is not yet reported in
literature.
This work is aimed to produce a new composition of GIC by incorporation of nano HAsilica
hybrid to obtain nanocomposites with superior properties. The HA-silica hybrid is
derived from in-situ sol-gel process that has been developed in our laboratory.
Therefore, incorporation of HA-silica inside the GIC has improved the hardness due to
the better interaction between HA-silica-GIC and homogeneous distribution of additives
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