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S Saha
S Saha
Tanzania
Publications
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Research Article
Microwave Sintering of Ceramics for Dentistry: Part 2
Author(s): R Vaderhobli*,S Saha R Vaderhobli*,S Saha
Fourteen dental copings (zirconia stabilized with 3 mol% yttria) were layered with Noritake dental glass-ceramic and sintered in the microwave furnace with various sintering temperatures. Sintered zirconia rectangular beams measuring 50 mm in length, 4 mm in width and 0.75 mm in height were coated with the dental glass-ceramic and sintered in the microwave furnace. These were subjected to a four-point bend test to calculate modulus of rupture. Sintering temperature of 800°C in the microwave furnace with ramp rates in excess of 100°C per minute was sufficient to attain good sintered crowns. Indentation hardness with 200g loads and 500g loads for the microwave-sintered teeth resulted in hardness values of 0.685 ± 0.0245 GPa and 6.56 ± 0.4 GPa. The indentation fracture toughness values with 200g and 500g were calculated to be 2.26 ± 0.8 MPa(m)0.5 and 0.97 &pl.. View More»
DOI: 10.4172/2161-1122.1000316