Investigation of Biodentine as dentine replacement material
Available online 15 May 2013
Abstract
Objective
Biodentine was compared to glass ionomer and resin modified cements in an “open sandwich” restoration.
Methods
Fuji
IX, Vitrebond and Biodentine were characterised using various
techniques. The effect of etching with 35% phosphoric acid was
investigated by assessment of surface topography, Fourier transform
infrared (FT-IR) spectroscopy, surface micro-hardness and micro-leakage
using tagged carboxylated-modified fluorescent microspheres and tracing
the presence of these particles with a confocal microscope.
Results
Acid
etching resulted in erosion of the material surface with exposure of
the glass particles in the glass ionomer-based materials. Biodentine
exhibited a reduction in the chlorine peak and the calcium–silicon
ratio. There was no difference in the micro-hardness in etched and
un-etched materials. The FT-IR plots did not show any chemical changes
caused by etching for all the materials investigated. Both Vitrebond and
Fuji IX exhibited no leakage at the dentine to material interface while
Biodentine exhibited leakage both when it was etched and also when the
surface was left unprepared. The sandwich technique was effective and
prevented micro-leakage with glass ionomer-based materials but
micro-leakage occurred with Biodentine.
Conclusions
Biodentine
demonstrated both structural and chemical changes when etched with 37%
phosphoric acid. Biodentine exhibited a lower calcium to silicon ratio
and a reduction in the chloride peak height when etched. When used as a
dentine replacement material in the sandwich technique overlayed with
composite, significant leakage occurred at the dentine to material
interface. On the other hand materials based on glass ionomer cement
were etched successfully and no chemical and physical changes or
micro-leakage were detected when the materials were used as bases under
composite restorations. The micro-hardness of all the materials was
unaffected by etching.
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