Influence of Er:YAG laser irradiation on surface properties of Ti-6Al-4V machined and hydroxyapatite coated

• Published in: Lasers in medical science Vol. 38; no. 1; p. 48
• Main Authors: Simões, Isadora Gazott, Kreve, Simone, Cruz, Marcos Antônio Eufrásio, Botelho, André Luís, Ramos, Ana Paula, dos Reis, Andréa Cândido, Valente, Mariana Lima da Costa
• Format: Journal Article
• Language: English
• Published: London Springer London 23.01.2023; Springer Nature B.V
• Subjects: Alloys; Aluminum; Coatings; Contact angle; Dentistry; Durapatite - chemistry; Hydroxyapatite; Irradiation; Lasers; Lasers, Solid-State; Medicine; Medicine & Public Health; Microscopy, Electron, Scanning; Optical Devices; Optics; Original Article; Parameters; Photonics; Protective coatings; Quantum Optics; Scanning electron microscopy; Semiconductor lasers; Surface Properties; Surface roughness; Surface treatment; Surgical implants; Titanium; Titanium base alloys; Vanadium; Wettability; Wetting; X-ray spectroscopy; YAG lasers; Titanium; Surface properties; Hydroxyapatite; Surface treatment; Laser
• ISSN: 1435-604X; 0268-8921; 1435-604X
• DOI: 10.1007/s10103-023-03719-z

Surface treatment by laser irradiation can change the topography of titanium; however, little is known about the changes it causes when applied to other coatings. This study aimed to evaluate the influence of Er:YAG laser irradiation on the surface properties of titanium-aluminum-vanadium (Ti-6Al-4V) discs. Four Ti-6Al-4V surfaces were evaluated ( n  = 10): CON—control, machined without surface treatment; LT—machined + laser treatment; HA—hydroxyapatite coating; and LT-HA—hydroxyapatite coating + laser treatment. For the laser treatment, an Er:YAG laser with a wavelength of 2940 nm, a frequency of 10 Hz, and an energy density of 12.8 J/cm 2 was used. The morphology of the coating was investigated by scanning electron microscopy and the surface composition by energy-dispersive X-ray spectroscopy. The influence of laser irradiation treatment on roughness and wettability was also evaluated. The Er:YAG laser promoted a significant reduction in the roughness Sa ( p  < 0.05) and in the contact angle ( p  = 0.002) of the LT surface compared to the CON surface. On the LT-HA surface, a significant decrease in roughness was observed only for the Rz parameter ( p  = 0.015) and an increase in the contact angle ( p  < 0.001) compared to the HA surface. The use of the Er:YAG laser with the evaluated parameters decreased the surface roughness and improved the wetting capacity of machined without surface treatment. In the group with hydroxyapatite coating, the laser influenced the surface roughness only for the parameter Rz and reduced their wetting capacity.