Effective UV/Ozone irradiation method for decontamination of hydroxyapatite surfaces

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Cell Biology

Background:

• Hydroxyapatite is a key biomaterial for bone regeneration.
• Surface contamination can impede osseointegration.
• Effective decontamination methods are crucial for biomaterial performance.

Purpose of the Study:

• To evaluate UV/ozone (O3) irradiation for decontaminating hydroxyapatite (HA) surfaces.
• To assess the impact of UV/O3 treatment on HA surface properties, including those modified by phosphoric acid (H3PO4).
• To investigate the in vitro response of osteoblast-like MC3T3-E1 cells to decontaminated HA surfaces.

Main Methods:

• Surface analysis techniques including surface roughness, X-ray photoelectron spectroscopy (XPS), and wettability measurements.
• UV/O3 irradiation of hydroxyapatite surfaces for varying durations.
• In vitro cell culture studies using MC3T3-E1 cells to assess proliferation, differentiation, and mineralization.

Main Results:

• UV/O3 irradiation significantly reduced carbon contamination and contact angle on HA surfaces (≥5 min and ≥3 min, respectively).
• Phosphoric acid-modified HA surfaces decontaminated with 5-min UV/O3 irradiation maintained low contact angles after 7-day storage.
• Irradiated surfaces significantly enhanced MC3T3-E1 cell proliferation, differentiation (ALP, OCN mRNA levels), and mineralization.

Conclusions:

• UV/O3 irradiation is an effective method for decontaminating H3PO4-modified hydroxyapatite surfaces.
• The treatment improves surface wettability and stability.
• Decontaminated surfaces promote enhanced osteoblast function, indicating potential for improved bone regeneration therapies.