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Properties and cyclic fatigue of glass infiltrated tape cast alumina cores produced using a water-based solvent

 Nam-Sik Oh  ;  Dae-Joon Kim  ;  Keun-Woo Lee  ;  Ho-Young Lee  ;  Joo L. Ong 
 DENTAL MATERIALS, Vol.23(4) : 442-449, 2007 
Journal Title
Issue Date
Aluminum Oxide/chemical synthesis* ; Aluminum Oxide/chemistry ; Analysis of Variance ; Carboxylic Acids ; Crowns* ; Dental Porcelain/chemical synthesis* ; Dental Porcelain/chemistry ; Dental Stress Analysis ; Emulsions ; Glass ; Hot Temperature ; Materials Testing ; Plasticizers ; Pliability ; Solvents ; Tensile Strength ; Water
OBJECTIVE: The purpose of this study was to investigate the properties of tape cast alumina composite produced using a water-based solvent and its possible clinical use as an all ceramic crown system in a fixed partial denture. Durability of the system will be measured by fatigue test to simulate the masticating conditions of the oral cavity. METHODS: The optimal weight ratio of water-based alumina tape was determined by tensile strength, shrinkage ratio and durability. The coefficient of thermal expansion, fracture toughness, biaxial flexural strength and flexural strength after fatigue test of a composite produced from alumina tape at optimal weight ratios were determined and compared to In-Ceram alumina core (control). RESULTS: The weight ratio of alumina/(alumina+binder+plasticizer) of 0.84 and binder/(binder+plasticizer) of 0.5 was observed to be the optimal composition for achieving excellent composite properties. Coefficient of thermal expansion of the sintered alumina tape was observed to be 7.3x10(-6)/degrees C, and this value was increased to 7.5x10(-6)/degrees C after infiltrating the sintered tape with glass. The fracture toughness and biaxial flexural strength of glass infiltrated alumina tape was observed to be 4.6 MPa m(1/2) and 498 MPa, respectively. After cyclic loading for 10(2)-10(6) cycles, no significant change in the biaxial flexural strength was observed between the glass infiltrated alumina core and the In-Ceram alumina core (p>0.05). SIGNIFICANCE: The observed properties provide evidence that the water-based tape cast alumina-glass composite is suitable for clinical use as an all ceramic crown system in a fixed partial denture.
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Lee, Keun Woo(이근우) ORCID logo https://orcid.org/0000-0002-3153-190X
Lee, Ho Yong(이호용)
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