Takahashi Masatoshi, Kikuchi Masafumi, Takada Yukyo
Division of Dental Bioaterials, Tohoku University Graduate School of Dentistry.
Dent Mater J. 2016;35(4):564-70. doi: 10.4012/dmj.2015-354.
The mechanical properties -tensile strength, yield strength, elongation after fracture, and Vickers hardness- and alloy phases of the dental cast alloys Ti-6%Nb-4%Cu, Ti-18%Nb-2%Cu, and Ti-24%Nb-1%Cu were investigated. Ti-6%Nb-4%Cu consisted of a single α-phase, while Ti-18%Nb-2%Cu and Ti-24%Nb-1%Cu consisted of α- and β-phases. The tensile strengths, yield strengths, and hardnesses of these alloys were higher than those of Ti-5%Cu and Ti-30%Nb; however, their breaking elongations were smaller. These differences in the mechanical properties are attributable to solid-solution strengthening or to precipitation strengthening by the dual-phase (α+β) structure. Thus, Ti-Nb-Cu alloys are suitable for use in high-strength dental prostheses, such as implantretained superstructures and narrow-diameter implants.
对牙科铸造合金Ti-6%Nb-4%Cu、Ti-18%Nb-2%Cu和Ti-24%Nb-1%Cu的力学性能（拉伸强度、屈服强度、断裂伸长率和维氏硬度）及合金相进行了研究。Ti-6%Nb-4%Cu由单一的α相组成，而Ti-18%Nb-2%Cu和Ti-24%Nb-1%Cu由α相和β相组成。这些合金的拉伸强度、屈服强度和硬度高于Ti-5%Cu和Ti-30%Nb；然而，它们的断裂伸长率较小。力学性能的这些差异归因于固溶强化或双相（α+β）结构的析出强化。因此，Ti-Nb-Cu合金适用于高强度牙科修复体，如种植体支持的上部结构和窄直径种植体。
