Abstract
To apply laser-sintered titanium (Ti) materials to dental prostheses with a three-dimensional structure such as partial dentures, we examined the microstructures and mechanical properties of commercially pure (CP) Ti grade (G) 2 annealed after laser sintering and laser-sintered (as-built) Ti-6Al-4V alloy. The tensile and fatigue properties of CP Ti G 2 annealed at 700 °C for 2 h after laser sintering were close to those of wrought CP Ti G 2 annealed at the same temperature after hot forging. The ultimate tensile strengths (σUTS) of 90°- and 0°-direction-built CP Ti G 2 rods after laser sintering 10 times were 553 and 576 MPa and the total elongations (TE) of these rods were 26% and 28%, respectively. The fatigue strengths (σFS) at 107 cycles of the 90°- and 0°-direction-built CP Ti G 2 rods after laser sintering 10 times were ~320 and ~365 MPa, respectively. The ratio σFS/σUTS was in the range of 0.5–0.7. The changes in the chemical composition and mechanical properties after laser sintering 10 times were negligible. The fatigue strength of the laser-sintered Ti-6Al-4V alloy was ~600 MPa, which was close to that of wrought Ti-6Al-4V alloy. These findings indicate that the laser-sintered CP Ti and Ti-6Al-4V alloy can also be applied in dental prostheses similarly to laser-sintered Co–Cr–Mo alloy. In particular, it was clarified that laser sintering using CP Ti G 4 powder is useful for dental prostheses.
Highlights
Alloy was ~600 MPa, which was close to that of wrought Ti-6Al-4V alloy. These findings indicate that the laser-sintered commercially pure (CP) Ti and Ti-6Al-4V alloy can be applied in dental prostheses to laser-sintered Co–Cr–Mo alloy
Metallic materials such as titanium (Ti) materials and cobalt–chromium–molybdenum (Co–Cr–Mo) alloys with excellent mechanical properties and structural stability have been widely used for dental prostheses [1,2,3]
We investigated the chemical composition, immersion property, microstructure, tensile property, and fatigue strength of CP Ti G 2 annealed at 700 ◦ C for 2 h after laser sintering for dental application with 3-D structures
Summary
Metallic materials such as titanium (Ti) materials and cobalt–chromium–molybdenum (Co–Cr–Mo) alloys with excellent mechanical properties and structural stability have been widely used for dental prostheses (especially metal frames for partial dentures, complete dentures, and implant superstructures) [1,2,3]. Ti materials (commercially pure (CP) Ti and Ti alloys) with high biocompatibility have been widely used for orthopedic implants and dental prostheses. Ti-6%Al-4%V alloy (here and hereafter values of alloy compositions indicate mass %) is widely used in the medical field and is standardized in ISO 5832-3 [5]. Since the O concentration in laser-sintered Ti-6Al-4V alloy increases upon laser sintering [6], high-purity Ti-6Al-4V G 5 powder for additive manufacturing (AM) has been standardized in ASTM F 2924 [7].
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