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Comparison of Various Time-Related Modifications of Ultraviolet Photofunctionalization on SLA-Treated Titanium
Summary
Short-term re-hydrophobization and repeated UV re-irradiation maintain titanium surface superhydrophilicity and bioactivity. These treatments preserve the original topography of sandblasted, large-grit, acid-etched (SLA) titanium surfaces without significant changes.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Dental Materials
Background:
- Titanium surfaces are crucial for dental implants, and their surface properties influence osseointegration.
- Photofunctionalization using ultraviolet (UV) irradiation can enhance titanium surface properties, but the long-term stability is a concern.
- Understanding how short-term treatments affect aged titanium surfaces is essential for clinical applications.
Purpose of the Study:
- To compare the effects of short-term re-hydrophobization (24 hours) and repeated UV re-irradiation (24 hours) on the physicochemical and biologic characteristics of aged titanium surfaces.
- To evaluate the maintenance of superhydrophilicity and bioactivity after these surface treatments.
Main Methods:
- Sandblasted, large-grit, acid-etched (SLA) titanium surfaces were biologically aged for 8 weeks.
- Surfaces were subjected to UV irradiation, followed by either storage (re-hydrophobization) or repeated UV irradiation (re-irradiation).
- Surface characteristics were analyzed using SEM, XPS, and water contact angle measurements; cell viability, osteogenic differentiation, and mineralization were assessed.
Main Results:
- All treated SLA titanium surfaces exhibited superhydrophilicity, with water contact angles below 2 degrees.
- No significant differences were observed in surface elemental composition (XPS), cell viability, or alkaline phosphatase (ALP) activity across groups.
- The re-irradiation group showed the highest calcium deposition, indicating a trend towards enhanced mineralization, though not statistically significant.
Conclusions:
- Short-term re-hydrophobization and repeated UV re-irradiation effectively maintain the improved superhydrophilicity and bioactivity of SLA titanium surfaces.
- These treatments do not alter the surface topography of aged SLA titanium.
- UV-based surface treatments offer a viable method for rejuvenating titanium implant surfaces.
