Effect of Nd:Yttrium-aluminum-garnet laser radiation on Ti6Al4V alloy properties for biomedical applications

Khosroshahi, Mohammad E.; Mahmoodi, Mahboobeh; Tavakoli, Javad; Tahriri, M.

doi:10.2351/1.2995762

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…From micro-mechanical point of view, the previous finding of enhanced properties [16,20,22] after laser treatment at 140 Jcm -2 compared to untreated, as well as 70 and 250 Jcm -2 samples, were consistent with new finding of significant difference between samples' surface morphologies. The higher surface hardness (850, 377 HVN for 140 Jcm -2 and untreated samples, respectively), enhanced corrosion resistance, lower contact angle (35°for 140 Jcm -2 and 70°for untreated sample) and higher surface tension (60 mNm -1 ) for 140 Jcm -2 compared to untreated surface (39 mNm -1 ) have been reported before.…”

Section: Discussionsupporting

confidence: 86%

“…Upon selecting non-appropriate surface properties, formation of a fibrous tissue layer between implant and bone negatively affect bone formation results in eventual loosening of implant [14]. Local hardening and improvement of wear and corrosion resistance, composition, hydrophilicity and surface roughness are known factors to affect osseointegrtaion process [15][16][17][18][19]. Among them, surface roughness seems to play an important role, while its optimization enhances hydrophilicity of the implant surface [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Surface morphology characterization of laser-induced titanium implants: lesson to enhance osseointegration process

Tavakoli

Khosroshahi

2018

Biomed. Eng. Lett.

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The surface properties of implant are responsible to provide mechanical stability by creating an intimate bond between the bone and implant; hence, play a major role on osseointegration process. The current study was aimed to measure surface characteristics of titanium modified by a pulsed Nd:YAG laser. The results of this study revealed an optimum density of laser energy (140 Jcm -2 ), at which improvement of osteointegration process was seen. Significant differences were found between arithmetical mean height (Ra), root mean square deviation (Rq) and texture orientation, all were lower for 140 Jcm -2 samples compared to untreated one. Also it was identified that the surface segments were more uniformly distributed with a more Gaussian distribution for treated samples at 140 Jcm -2 . The distribution of texture orientation at high laser density (250 and 300 Jcm -2 ) were approximately similar to untreated sample. The skewness index that indicates how peaks and valleys are distributed throughout the surface showed a positive value for laser treated samples, compared to untreated one. The surface characterization revealed that Kurtosis index, which tells us how high or flat the surface profile is, for treated sample at 140 Jcm -2 was marginally close to 3 indicating flat peaks and valleys in the surface profile.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Surface morphology characterization of laser-induced titanium implants: lesson to enhance osseointegration process

Tavakoli

Khosroshahi

2018

Biomed. Eng. Lett.

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“…The laser-material interaction time is low at higher laser scanning speeds, and subsequently higher cooling rate and thermal gradient than the lower laser scanning speeds. Rapid solidification and cooling that occurred at high laser speed induced a higher microhardness value which agrees with reported data by Tavakoli et al (21).…”

Section: Microhardness Resultssupporting

confidence: 92%

“…Tafel plots in Figure 12 revealed that there are no pitting corrosion sites before and after the laser treatment (negative loop) during immersion of the laser-treated substrate in the salt solution. However, despite that, the laser treatment showed an additional improvement through the decrease in the value of the current density from 7.969*10 -7 to 3.969*10 -7 Amp which agree with (21). Furthermore, there is a noble shift of the curve if compared with untreated Ti.…”

Section: Chemical Corrosion Resultssupporting

confidence: 81%

Laser Scanning Speed Influences on Assessment of Laser Remelted Commercially Pure Titanium Grade 2

Mohammed Naji,

Ali Bash,

Resen

2024

IJE

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In this research, the influences of laser surface remelting using different scanning speeds on the microstructure, roughness, and hardness of Commercial pure Titanium (Grade 2) were investigated. High power Nd: YAG pulsed laser was used. The laser scanning speeds used in this study were 4, 6, 8, and 10 mm/s and the other laser parameters (power, pulse frequency, beam diameter) were constant. The corrosion performance of the laser surface remelted and Cp titanium was then evaluated by potential dynamic measurements in a 3.5% NaCl solution. The results revealed that due to the diffusionless transformation after laser surface treatment and the formation of the martensite phase, the surface postlaser treatment was significantly different from those before the treatment. The results were indicated using an optical microscope, FE-SEM, XRD, AFM, and microhardness analysis. It was found the lowest scanning speed, 4 mm/s, had the slightest roughness and the smallest average grain size (26.06 nm) due to the high input energy and slow cooling rate, while the highest scanning speed (10 mm/s) had the greatest microhardness (291.5 Hv) due to the short interaction time between the substrate surface and laser beam and the higher cooling rate. The results also demonstrated the obvious improvement in the pitting resistance of Cp Ti in harsh environments as a result of the influence of laser remelting.

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“…The understanding of wetting of a surface by a liquid, leading to the spreading of those liquids over the surface, can be seen as a crucial factor that is adopted within surface chemistry and surface engineering including applications such as biomaterials [1][2][3] and coating technologies [4,5]. As demonstrated in current surface engineering literature, wettability characteristics of many materials can be altered by the means of laser-induced surface treatment [1,6,7] and other surface treatments [8][9][10]. Despite increased academic recognition and demand for greater industrial deployment, wetting and the effects of surface modification are still not fully understood within the engineering community.…”

Section: Introductionmentioning

confidence: 99%

Modulating the wettability characteristics and bioactivity of polymeric materials using laser surface treatment

Waugh¹,

Lawrence²,

Shukla³

2016

Journal of Laser Applications

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It has been thoroughly demonstrated previously that lasers hold the ability to modulate surface properties of materials with the result being utilization of such lasers in both research and industry. What is more, these laser surface treatments have been shown to affect the adhesion characteristics and bio-functionality of those materials. This paper details the use of a Synrad CO2 laser marking system to surface treat nylon 6,6 and polytetrafluoroethylene (PTFE). The laser-modified surfaces were analyzed using 3D surface profilometry to ascertain an increase in surface roughness when compared to the as-received samples. The wettability characteristics were determined using the sessile drop method and showed variations in contact angle for both the nylon 6,6 and PTFE. For the PTFE it was shown that the laser surface treatment gave rise to a more hydrophobic surface with contact angles of up to 150° being achieved. For the nylon 6,6, it was observed that the contact angle was modulated approximately ±10° for different samples which could be attributed to a likely mixed state wetting regime. The effects of the laser surface treatment on osteoblast cell and stem cell growth is discussed showing an overall enhancement of biomimetic properties, especially for the nylon 6,6. This work investigates the potential governing parameters which drives the wettability/adhesion characteristics and bioactivity of the laser surface treated polymeric materials.

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Effect of Nd:Yttrium-aluminum-garnet laser radiation on Ti6Al4V alloy properties for biomedical applications

Cited by 14 publications

References 21 publications

Surface morphology characterization of laser-induced titanium implants: lesson to enhance osseointegration process

Surface morphology characterization of laser-induced titanium implants: lesson to enhance osseointegration process

Laser Scanning Speed Influences on Assessment of Laser Remelted Commercially Pure Titanium Grade 2

Modulating the wettability characteristics and bioactivity of polymeric materials using laser surface treatment

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