Abstract
Mechanical properties and corrosion resistance for dental castings with Ti-15%Zr-4%Nb-4%Ta alloy without V and Al were evaluated by tensile test at room temperature, micro Vickers hardness test, anodic polarization test in 1% lactic acid and artificial saliva solutions. Trial fabrication of metal plates for complete and partial dentures, crown, and bridge with the new titanium alloy was conducted.The 0.2%proof strength and ultimate tensile strength for the dental cast were 739±53 MPa and 915±51MPa, respectively. Total elongation and reduction of area were 7±2%and 8±6%, respectively, and Young's modulus was 86±8GPa. The results were satisfactory compared to the Japanese Industrial Standard values for various dental casting alloys. However, micro Vickers hardness on the casting surface was higher than that in the center. Anodic polarization curves of the dental casting showed corrosion resistance similar to that of annealed Ti-15%Zr-4%Nb-4%Ta alloy. Current density in the high-potential region (over 2 V vs. SCE) was lower than that of Ti-6%A1-4%V ELI (Extra Low Interstitial) alloy. Moreover, the Ti-15%Zr-4%Nb-4%Ta alloy was found to be applicable for making a dental prosthesis using casting conditions similar to those of commercial pure titanium (CP Ti) casting. The findings indicated that the Ti-15%Zr-4%Nb-4%Ta alloy could be successfully used as a dental casting alloy.
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