Fabrication and Characterization of High Strength Dental Porcelain Nanocomposite from Thailandís Raw Materials
Attavit Pisitanusorn*[a], Supon Ananta [a], Rattikorn Yimnirun [a] and Sakdipown Thiansem [b]* Author for corresponding; e-mail address: attavit@chiangmai.ac.th
Volume: Vol.32 No.3 (SEPTEMBER 2005)
Research Article
DOI:
Received: -, Revised: -, Accepted: -, Published: -
Citation: Pisitanusorn A., Ananta S., Yimnirun R. and Thiansem S., Fabrication and Characterization of High Strength Dental Porcelain Nanocomposite from Thailandís Raw Materials, Chiang Mai Journal of Science, 2005; 32(3): 549-553.
Abstract
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.m0.5 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).