Electrostatic layer-by-layer assembly for fabricating morphology-controlled hydroxyapatite/zirconia composite with...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Orthopedic & Dental Implants

Background:

• Yttria-stabilized zirconia (YSZ) offers mechanical strength and aesthetics for implants but lacks osteoconductivity.
• Hydroxyapatite (HAp) coatings can improve implant osseointegration, yet uniform, morphology-controlled deposition on YSZ is difficult.
• Optimizing implant performance requires overcoming challenges in HAp coating uniformity on YSZ.

Purpose of the Study:

• To achieve uniform deposition of morphology-controlled hydroxyapatite (HAp) on yttria-stabilized zirconia (YSZ) using electrostatic layer-by-layer (LBL) assembly.
• To enhance the biological performance of YSZ implants through improved HAp coating.
• To investigate the osteogenic response of HAp-coated YSZ.

Main Methods:

• Synthesized plate-like HAp and modified its surface charge.
• Surface-modified YSZ discs to enable electrostatic adsorption of HAp.
• Utilized LBL assembly for HAp deposition, followed by comprehensive material characterization and in vitro osteogenic assays.

Main Results:

• Achieved uniform, homogeneous deposition of negatively charged HAp onto positively charged YSZ via LBL assembly.
• Confirmed successful HAp coating and observed enhanced surface hydrophilicity.
• Demonstrated significantly improved osteogenic differentiation of MC3T3-E1 cells on HAp/YSZ composites, evidenced by increased alkaline phosphatase activity and calcium deposition.

Conclusions:

• LBL-mediated deposition provides a method for uniform, morphology-controlled HAp coating on YSZ.
• The enhanced osteogenic activity of HAp/YSZ composites signifies potential for advanced bioactive zirconia implants.
• This approach facilitates the development of next-generation dental and orthopedic implants with improved biological integration.