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- W2018087769 abstract "This study examined the effects of TiN (titanium nitride) and WC (tungsten carbide) coatings on the fatigue characteristics of dental implants using a sinusoidal cyclic loading machine under load between 42–420 N and 58–580 N according to the ISO 14801. In this study, an abutment screw was coated with a TiN and WC film by EB-PVD and sputtering, respectively. For the fatigue test, the implant fixture and abutment were tightened to a torque 32 Ncm using a digital torque gauge with 0.1 Ncm accuracy. Field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) were used to observe the coated surface and fracture surface of the abutment screw. The uncoated abutment screws contained scratches caused by the mechanical process, whereas the TiN and WC coated screws showed a smooth surface at the screw thread and screw valley. The mean fatigue life of the uncoated, TiN coated, and WC coated abutment screw at 420 N was 5.8 × 105, 8.2 × 105 and 106 cycles, respectively. At 580 N, the mean fatigue life of the uncoated, TiN coated and WC coated abutment screw was 2.1 × 104, 4.1 × 104 and 2.3 × 104 cycles, respectively. The uncoated abutment screw showed the beach mark and fatigue striation. On the other hand, in the case of TiN and WC coated abutment screws, the semi-cleavage fracture and ductile fracture appeared at 420 N. Semi-cleavage fracture and massive fatigue striation with a step of 0.5 μm/cycle were observed in TiN coated abutment screw, whereas a minute slip band was noted and the interval of fatigue striation increased to several μm/cycle in the WC coated screw at 580 N." @default.
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- W2018087769 date "2014-03-01" @default.
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- W2018087769 title "Effects of TiN and WC coating on the fatigue characteristics of dental implant" @default.
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- W2018087769 doi "https://doi.org/10.1016/j.surfcoat.2012.02.046" @default.
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