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


CONCLUSIONS
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.
Oh
Nam-Sik
NS
Department of Dentistry, Inha University, Incheon, Republic of Korea.
Kim
Dae-Joon
DJ
Ong
Joo L
JL
Lee
Ho-Young
HY
Lee
Keun-Woo
KW
D000537:Aluminum Oxide / Q000138:chemical synthesis* / Q000737:chemistry; D000704:Analysis of Variance; D002264:Carboxylic Acids; D003442:Crowns; D003776:Dental Porcelain / Q000138:chemical synthesis* / Q000737:chemistry; D003799:Dental Stress Analysis; D004655:Emulsions; D005898:Glass; D006358:Hot Temperature; D008422:Materials Testing; D010968:Plasticizers; D018583:Pliability; D012997:Solvents; D013718:Tensile Strength; D014867:Water
D002264:Carboxylic Acids; D004655:Emulsions; D010968:Plasticizers; D012997:Solvents; D014867:Water; D003776:Dental Porcelain; C070870:In-Ceram; D000537:Aluminum Oxide