Koizumi Hiroyasu, Ishii Takaya, Okazaki Tomoyo, Kaketani Masahiro, Matsumura Hideo, Yoneyama Takayuki
Department of Fixed Prosthodontics, Nihon University School of Dentistry.
Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry.
J Oral Sci. 2018;60(2):285-292. doi: 10.2334/josnusd.17-0280.
The castability, mechanical properties, and fracture characteristics of Ti-15Mo-5Zr-3Al alloy were compared with those of Ti-6Al-7Nb alloy and pure titanium (CP Ti) for application of this β-type titanium alloy in cast dental prostheses. Cast specimens were prepared with a centrifugal casting machine. A tensile test was performed according to ISO standard 22674. The castability index for Ti-15Mo-5Zr-3Al was lower than those for Ti-6Al-7Nb and CP Ti. The tensile strength of Ti-15Mo-5Zr-3Al was 852 MPa, which was lower than that of Ti-6Al-7Nb and higher than that of CP Ti. The proof strength of Ti-15Mo-5Zr-3Al was 799 MPa, which was comparable to that of Ti-6Al-7Nb and higher than that of CP Ti. The elastic modulus of Ti-15Mo-5Zr-3Al was 81.0 GPa, which was lower than the values for Ti-6Al-7Nb and CP Ti. Elongation of Ti-15Mo-5Zr-3Al was 5.1%, which was comparable to that of Ti-6Al-7Nb and less than that of CP Ti. The shape of the fractured segment was narrower for Ti-15Mo-5Zr-3Al than for Ti-6Al-7Nb and CP Ti. The deformation characteristics of Ti-15Mo-5Zr-3Al may result in decreased stress relative to increased strain during plastic deformation in the stress-strain diagram. In conclusion, Ti-15Mo-5Zr-3Al alloy has a low elastic modulus and exhibits limited ductile plastic deformation in cast dental prostheses.
为了将这种β型钛合金应用于铸造牙科修复体，对Ti-15Mo-5Zr-3Al合金的铸造性能、力学性能和断裂特性与Ti-6Al-7Nb合金及纯钛（CP Ti）进行了比较。使用离心铸造机制备铸造试样。根据ISO标准22674进行拉伸试验。Ti-15Mo-5Zr-3Al的铸造性能指数低于Ti-6Al-7Nb和CP Ti。Ti-15Mo-5Zr-3Al的抗拉强度为852 MPa，低于Ti-6Al-7Nb但高于CP Ti。Ti-15Mo-5Zr-3Al的屈服强度为799 MPa，与Ti-6Al-7Nb相当但高于CP Ti。Ti-15Mo-5Zr-3Al的弹性模量为81.0 GPa，低于Ti-6Al-7Nb和CP Ti的值。Ti-15Mo-5Zr-3Al的伸长率为5.1%，与Ti-6Al-7Nb相当但低于CP Ti。Ti-15Mo-5Zr-3Al断裂段的形状比Ti-6Al-7Nb和CP Ti更窄。在应力-应变图中，Ti-15Mo-5Zr-3Al的变形特性可能导致塑性变形期间相对于应变增加应力降低。总之，Ti-15Mo-5Zr-3Al合金具有低弹性模量，并且在铸造牙科修复体中表现出有限的延性塑性变形。
