Machinable glass-ceramics forming as a restorative dental material

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概要

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• MgO, SiO2, Al2O3, MgF2, CaF2, CaCO3, SrCO3, and P2O5 were used to prepare glass-ceramics for restorative dental materials. Thermal properties, phases, microstructures and hardness were characterized by DTA, XRD, SEM and Vickers microhardness. Three-point bending strength and fracture toughness were applied by UTM according to ISO 6872: 1997(E). XRD showed that the glass crystallized at 892°C (second crystallization temperature+20°C) for 3 hrs consisted mainly of calcium-mica and fluorapatite crystalline phases. Average hardness (3.70 GPa) closely matched human enamel (3.20 GPa). The higher fracture toughness (2.04 MPa√m) combined with the hardness to give a lower brittleness index (1.81 μm−1/2) which indicates that they have exceptional machinability. Bending strength results (176.61 MPa) were analyzed by Weibull analysis to determine modulus value (m=17.80). Machinability of the calcium mica-fluorapatite glass-ceramic was demonstrated by fabricating with CAD/CAM.

• 2011-05-01

著者

• YAMASHITA Kimihiro

  Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University

• Yamashita Kimihiro

  Institute Of Biomaterials And Bioengineering Department Of Inorganic Materials Tokyo Medical And Den

• Yamashita Kimihiro

  Institute Of Biomaterials And Bioengineering Tokyo Medical And Dental University

• CHAYSUWAN Duangrudee

  Department of Materials Engineering, Faculty of Engineering, Kasetsart University

• SIRINUKUNWATTANA Krongkarn

  Department of Materials Engineering, Faculty of Engineering, Kasetsart University

• KANCHANATAWEWAT Kanchana

  Institute of Advanced Dental Medicine, Rangsit University

• HENESS Greg

  Department of Physics and Advanced Materials, Faculty of Science, University of Technology

• Kanchanatawewat Kanchana

  Institute Of Advanced Dental Medicine Rangsit University

• Sirinukunwattana Krongkarn

  Department Of Materials Engineering Faculty Of Engineering Kasetsart University

• Chaysuwan Duangrudee

  Department Of Materials Engineering Faculty Of Engineering Kasetsart University

• Heness Greg

  Department Of Physics And Advanced Materials Faculty Of Science University Of Technology

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