Dehydration and Rehydration of an Ion-Leachable Glass Used in Glass-Ionomer Cements

Kłos, Jacek

doi:10.13168/cs.2017.0004

Cited by 2 publications

(2 citation statements)

References 23 publications

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Section: Introductionmentioning

confidence: 99%

“…We have also shown that the glass G338 loses mass on heating but can regain only a fraction of this loss even under high humidity conditions [ 21 ]. The heat-treated glass sets quicker when mixed with polyacrylic acid than the as-received glass but gives a weaker set cement [ 21 ]. These findings suggest that heat treatment leads to the loss of surface silanol groups on the glass surface and the formation of siloxane groups.…”

Section: Introductionmentioning

confidence: 99%

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Surface Studies on Glass Powders Used in Commercial Glass-Ionomer Dental Cements

et al. 2021

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The surface properties of three commercial ionomer glass powders, i.e., Fuji IX, Kavitan Plus and Chemadent G-J-W were studied. Samples were analyzed by X-ray fluorescence spectroscopy (XRF), and the density was determined by gas pycnometry. Morphology was studied using scanning electron microscopy (SEM) and laser diffraction (LD) technique, whereas low-temperature nitrogen sorption measurements determined textural parameters like specific surface area and pore volume. Thermal transformations in the materials studied were evaluated by thermogravimetric analysis (TGA), which was carried out in an inert atmosphere between 30 °C and 900 °C. XRF showed that Fuji IX and Kavitan Plus powders were strontium-based, whereas Chemadent G-J-W powder was calcium-based. Powders all had a wide range of particle sizes under SEM and LD measurements. Specific surface areas and pore volumes were in the range 1.42–2.73 m2/g and 0.0029 to 0.0083 cm3/g, respectively, whereas densities were in the range 2.6428–2.8362 g/cm3. Thermogravimetric analysis showed that the glass powders lost mass in a series of steps, with Fuji IX powder showing the highest number, some of which are attributed to the dehydration and decomposition of the polyacrylic acid present in this powder. Mass losses were more straightforward for the other two glasses. All three powders showed distinct losses at around 780 °C and 835 °C, suggesting that similar dehydration steps occur in all these glasses. Other steps, which differed between glass powders, are attributed to variations in states of water-binding on their surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%