Photofunctionalised Ti6Al4V implants enhance early phase osseointegration

Area of Science:

• Biomaterials Science
• Orthopaedic Surgery
• Dental Implantology

Background:

• Ultraviolet (UV) light photofunctionalisation is established to improve osseointegration for pure titanium (Ti) implants.
• Titanium alloy (Ti6Al4V) is widely used in orthopaedic and dental applications, but its photofunctionalisation and subsequent osseointegration require further investigation.

Purpose of the Study:

• To investigate the effect of UV light-mediated photofunctionalisation on the osseointegration of Ti6Al4V implants.
• To compare the early and late phases of osseointegration for photofunctionalised Ti6Al4V implants.

Main Methods:

• Ti6Al4V implants were treated with UV light. Surface chemistry and contact angles were analyzed.
• Implants were surgically placed into rat femurs, with analysis at two and four weeks post-surgery.
• Histomorphometric analysis, including bone-implant contact (BIC) and bone volume (BV) ratios, was performed using microcomputed tomography and histological data.

Main Results:

• UV treatment significantly reduced surface carbon content and contact angle on Ti6Al4V implants.
• A significant increase in BIC ratios was observed for UV-treated implants at two weeks, but not at four weeks.
• No significant differences in BV ratios were found between UV-treated and control implants at either time point.

Conclusions:

• Photofunctionalisation of Ti6Al4V implants promotes osseointegration during the early stages.
• The positive effect on osseointegration appears limited to the initial phase, with no lasting impact on bone volume.
• UV light treatment offers a potential method to enhance early implant stability in Ti6Al4V applications.