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KMID : 0362120040260010077
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Journal of Technologic Dentistry
2004 Volume.26 No. 1 p.77 ~ p.88
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Effects of Heat-treatment on Crystallization and Mechanical Properties of Glass ceramics for Dental crown prosthesis in the system CaO-MgO-SiO2-P2O5-TiO2
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Chung In-Sung
Kim Bu-Sob
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Abstract
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Glass ceramics for dental crown prosthesis were prepared by crystallization of CaO-MgO-SiO2-P2O5-TiO2 glasses. Their crystallization behaviors have been investigated as a function of heat-treatment temperature and holding time in relation to mechanical properties.The results are as follows:Vickers hardness and bending strength of glass ceramics increased due to the precipitation ofapatite, whitlockite, -wollastonite, magnesium titanate, and diopside crystal phases within glassmatrix. The final crystalline phase assemblages and the microstructures of the glass ceramics were foundto be dependent on heat-treatment temperature and holding time.Vickers hardnes and bending strength of glass ceramics increased with increasing heat-treatmenttemperature and holding time.
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KEYWORD
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Glass ceramics, Vickers hardness, Bending strength, Heat-treatment temperature
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