Calcium phosphate coatings obtained by Nd:YAG laser cladding: physicochemical and biologic properties

Area of Science:

• Biomaterials Science
• Materials Engineering
• Orthopedic Technology

Background:

• Plasma spraying (PS) is the standard for calcium phosphate (CaP) coatings on cementless prostheses.
• PS coatings exhibit drawbacks including poor adhesion, low strength, and brittleness.
• Improved CaP coating methods are needed for better implant fixation and osteointegration.

Purpose of the Study:

• To introduce and evaluate laser surface cladding as an alternative CaP coating technique.
• To address the limitations of plasma spraying for biomedical applications.
• To assess the potential of laser cladding for orthopedic implants.

Main Methods:

• Calcium phosphate (CaP) coatings were applied to a Ti alloy using Nd:YAG laser surface cladding.
• Coating physicochemical properties were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX).
• In vitro biologic evaluation was performed using human osteoblast-like MG-63 cells.

Main Results:

• Laser surface cladding successfully produced CaP coatings on Ti alloy substrates.
• Physicochemical characterization confirmed the coating's integrity and composition.
• In vitro studies indicated favorable biological responses of the coatings with MG-63 cells.

Conclusions:

• Nd:YAG laser cladding is a promising technique for creating CaP coatings in the biomedical field.
• This method offers potential advantages over plasma spraying for orthopedic implant applications.
• Laser cladding demonstrates potential for enhanced implant fixation and osteointegration.