Effects of Different Hydroxyapatite Binders on Morphology, Ca/P Ratio and Hardness of Nd-YAG Laser Clad Coatings

Chien, Chi-Sheng; Han, Tengfei; Hong, T.; Kuo, Tsung-Yuan; Liao, Tze Yuan

doi:10.2320/matertrans.m2009245

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…8 Cross-sectional hardness profiles of FA/Al 2 O 3 specimenstechnique used and the parameter settings applied. For example, recent studies have shown that their hardness may range from 260 to 1000 HV[21,[37][38][39]. The results obtained in this study have shown that the addition of Al 2 O 3 to FA yields a hardness value of up to 1300 HV.…”

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confidence: 48%

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

et al. 2016

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Hydroxyapatite (HA) is one of the most commonly used coating materials for metal implants. However, following high-temperature deposition, HA easily decomposes into an unstable phase or forms an amorphous phase, and hence, the long-term stability of the implant is reduced. Accordingly, the present study investigates the use of fluorapatite (FA) fortified with 20 wt% alumina (a-Al 2 O 3 ) as an alternative biomedical coating material. The coatings are deposited on Ti6Al4V substrates using a Nd:YAG laser cladding process performed with laser powers and travel speeds of 400 W/200 mm/min, 800 W/400 mm/min and 1200 W/600 mm/min, respectively. The results show that for all of the specimens, a strong metallurgical bond is formed at the interface between the coating layer and the transition layer due to melting and diffusion. The XRD analysis results reveal that the cladding layers in all of the specimens consist mainly of FA, b-TCP, CaF 2 , Ti and h-Al 2 O 3 phases. In addition, the cladding layers of the specimens prepared using laser powers of 400 and 800 W also contain CaTiO 3 and CaAl 2 O 4 , while that of the specimen clad using a power of 1200 W contains TTCP and CaO. Following immersion in simulated body fluid for 14 days, all of the specimens precipitate dense bone-like apatite and exhibit excellent bioactivity. However, among all of the specimens, the specimen that is prepared with a laser power of 800 W shows the best biological activity due to the presence of residual FA, apatite-generating CaTiO 3 and a rough cladding layer surface.

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confidence: 48%

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

et al. 2016

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“…The slow degradation of the β-TCP coating occurred in the course of bone remodelling without loss of fixation, and osteoclasts probably played a major role. Degraded β-TCP at the interface likely induced the formation of new bone (Tanimoto and Nishiyama, 2008, Chien et al, 2009). Slow coating resorption and bone remodelling have resulted in an extent of bone-implant osseointegration.…”

Section: Resultsmentioning

confidence: 99%

Implementation and characterization of coating pure titanium dental implant with sintered β-TCP by using Nd:YAG laser

Safi

Hussein

Al-Shammari

et al. 2019

The Saudi Dental Journal

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ObjectivesThis work presents laser coating of grade 1 pure titanium (Ti) dental implant surface with sintered biological apatite beta-tricalcium phosphate (β-TCP), which has a chemical composition close to bone.Materials and methodsPulsed Nd:YAG laser of single pulse capability up to 70 J/10 ms and pulse peak power of 8 kW was used to implement the task. Laser pulse peak power, pulse duration, repetition rate and scanning speed were modulated to achieve the most homogenous, cohesive and highly adherent coat layer. Scanning electron microscopy (SEM), energy dispersive X-ray microscopy (EDX), optical microscopy and nanoindentation analyses were conducted to characterise and evaluate the microstructure, phases, modulus of elasticity of the coating layer and calcium-to-phosphate ratio and composition.Results showed that the laser power and scanning speed influenced coating adherence. The cross-sectional field-emission scanning electron microscopy images at low power and high speed showed poor adherence and improved as the laser power increased to 2 kW. Decreasing the scanning speed to 0.2 mm/s at the same power of 2 kW increased adherence. EDX results of the substrate demonstrated that the chemical composition of the coat layer did not change after processing. Moreover, the maps revealed proper distribution of Ca and P with some agglomeration on the surface. The sharp peaks on the X-ray diffraction patterns indicated that β-TCPs in the coat layer were mostly crystalline. The elastic modulus was low at the surface and increased gradually with depth to reach 19 GPa at 200 nm; this value was close to that of bone. The microhardness of the coated substrate increased by about 88%. The laser pulse energy of 8.3 J, pulse peak power of 2 kW, pulse duration of 4.3 min, repetition rate of 10 Hz and scanning speed of 0.2 ms−1 yielded the best results.ConclusionBoth processing and coating have potential use for dental implant applications.

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“…The slow release of HA ions at the interface probably stimulates the formation of new bones. 38,39 An extended osseointegration will result from slow resorption of implant coating and bone remodeling. Coated Ti dental implants will be covered with three-layered cell sheets that successfully form using collagen grafts as a scaffold 40 to construct biohybrid implants.…”

Section: Discussionmentioning

confidence: 99%

Effects of Long Durations of RF–Magnetron Sputtering Deposition of Hydroxyapatite on Titanium Dental Implants

et al. 2021

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Objectives Dental implant is a revolution in dentistry; some shortages are still a focus of research. This study use long duration of radiofrequency (RF)–magnetron sputtering to coat titanium (Ti) implant with hydroxyapatite (HA) to obtain a uniform, strongly adhered in a few micrometers in thickness. Materials and Methods Two types of substrates: discs and root form cylinders were prepared using a grade 1 commercially pure (CP) Ti rod. A RF–magnetron sputtering device was used to coat specimens with HA. Magnetron sputtering was set at 150 W for 22 hours at 100°C under continuous argon gas flow and substrate rotation at 10 rpm. Coat properties were evaluated via field emission scanning electron microscopy (FESEM), scanning electron microscopy–energy dispersive X-ray (EDX) analysis, atomic force microscopy, and Vickers hardness (VH). Student’s t-test was used. Results All FESEM images showed a homogeneous, continuous, and crack-free HA coat with a rough surface. EDX analysis revealed inclusion of HA particles within the substrate surface in a calcium (Ca)/phosphorus (P) ratio (16.58/11.31) close to that of HA. Elemental and EDX analyses showed Ca, Ti, P, and oxygen within Ti. The FESEM views at a cross-section of the substrate showed an average of 7 µm coat thickness. Moreover, these images revealed a dense, compact, and uniform continuous adhesion between the coat layer and the substrate. Roughness result indicated highly significant difference between uncoated Ti and HA coat (p-value < 0.05). A significant improvement in the VH value was observed when coat hardness was compared with the Ti substrate hardness (p-value < 0.05). Conclusion Prolonged magnetron sputtering successfully coat Ti dental implants with HA in micrometers thickness which is well adhered essentially in excellent osseointegration.

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Effects of Different Hydroxyapatite Binders on Morphology, Ca/P Ratio and Hardness of Nd-YAG Laser Clad Coatings

Cited by 13 publications

References 18 publications

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

Implementation and characterization of coating pure titanium dental implant with sintered β-TCP by using Nd:YAG laser

Effects of Long Durations of RF–Magnetron Sputtering Deposition of Hydroxyapatite on Titanium Dental Implants

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