Surface Modification of Polyetheretherketone With Calcium Phosphate Using Ultraviolet Functionalization

Area of Science:

• Biomaterials Science
• Surface Engineering
• Orthopedic Implants

Background:

• Polyetheretherketone (PEEK) is a common biomaterial for implants due to its mechanical properties.
• The hydrophobicity of PEEK hinders osseointegration, limiting its clinical performance.
• Surface modification techniques are crucial for improving PEEK's biological interactions.

Purpose of the Study:

• To investigate the efficacy of ultraviolet (UV) light-assisted functionalization for grafting hydroxyapatite (HAp) onto PEEK surfaces.
• To evaluate the impact of HAp-functionalized PEEK on osteogenic activity in vitro.
• To explore a novel method for enhancing the osseointegration of PEEK medical devices.

Main Methods:

• PEEK samples were fabricated using fused filament fabrication.
• Samples underwent UV irradiation in simulated body fluid (SBF) to graft HAp.
• Surface characterization involved ATR-FTIR and SEM with EDS.
• In vitro cell studies with preosteoblasts assessed osteogenic activity via alkaline phosphatase.

Main Results:

• UV-assisted functionalization successfully deposited a calcium phosphate layer onto the PEEK surface.
• Scanning electron microscopy confirmed the presence of the grafted material.
• In vitro studies demonstrated significantly enhanced osteogenic activity on HAp-functionalized PEEK compared to controls at 7 and 14 days.

Conclusions:

• UV light-assisted grafting of HAp is an effective method for modifying PEEK surfaces.
• The functionalization significantly improves the osteogenic potential of PEEK.
• This approach holds promise for developing next-generation PEEK implants with enhanced osseointegration.