Chiang Mai Journal of Science

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Composition, microstructure and mechanical properties relationships of dental porcelai  nanocomposites have been investigated. The sintering conditions and optimum composition for the fabrication of low-fusing dental porcelain were determined. To achieve the optimum mechanical properties, the dwell time and heating/cooling rates for each composition were determined as 3 min and 50°C/min, respectively. It is determined that the most promising composition ratio for high strength low-fusing dental porcelain fritting applications is 70 wt% feldspar - 21 wt% quartz - 9 wt % kaolinite, which showed the maximum flexural strength and microhardness values of 67 MPa and 0.645 GPa, respectively. However, the maximum fracture toughness value of 3.01 MPa.m^0.5  was found in the composition of 80 wt% feldspar - 17 wt% quartz - 3 wt % kaolinite. Most importantly, these measured flexural strength and fracture toughness values are noticeably higher than those of the dental porcelain specifications (ISO 6872).

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