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http://dx.doi.org/10.4191/kcers.2017.54.2.09

Influence of the MgO-TiO2 Co-Additive Content on the Phase Formation, Microstructure and Fracture Toughness of MgO-TiO2-Reinforced Dental Porcelain Nanocomposites  

Waiwong, Ranida (Department of Prosthodontics, Faculty of Dentistry, Chiang Mai University)
Ananta, Supon (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University)
Pisitanusorn, Attavit (Department of Prosthodontics, Faculty of Dentistry, Chiang Mai University)
Publication Information
Journal of the Korean Ceramic Society / v.54, no.2, 2017 , pp. 141-149 More about this Journal
Abstract
The influence of the co-additive concentration (0 - 45 wt% with an interval of 5 wt%) of MgO-$TiO_2$ on the phase formation, microstructure and fracture toughness of MgO-$TiO_2$-reinforced dental porcelain nanocomposites derived from a one-step sintering technique were examined using a combination of X-ray diffraction, scanning electron microscopy and Vickers indentation. It was found that MgO-$TiO_2$-reinforced dental porcelain nanocomposites exhibited significantly higher fracture toughness values than those observed in single-additive (MgO or $TiO_2$)-reinforced dental porcelain composites at any given sintering temperature. The amount of MgO-$TiO_2$ as a co-additive was found to be one of the key factors controlling the phase formation, microstructure and fracture toughness of these nanocomposites. It is likely that 30 wt% of MgO-$TiO_2$ as a co-additive is the optimal amount for $MgTi_2O_5$ and $Mg_2SiO_4$ crystalline phase formation to obtain the maximum relative density (96.80%) and fracture toughness ($2.60{\pm}0.07MPa{\cdot}m^{1/2}$) at a sintering temperature of $1000^{\circ}C$.
Keywords
Co-additive; Dental porcelain; MgO-$TiO_2$ content; Nanocomposites;
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