Tissue-response to calcium-bonded titanium surface.

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Surface Chemistry

Background:

• Titanium (Ti) is a widely used biomaterial for orthopedic implants.
• Previous studies indicated that calcium-bonded titanium (Ca-Ti) surfaces, formed through hydrothermal reactions, exhibit bone-apatite-like formation in simulated body fluid.
• Optimizing titanium surface properties is crucial for improving osseointegration and implant success.

Purpose of the Study:

• To evaluate the in vivo biological response to a Ca-Ti surface.
• To compare the bone response to Ca-Ti surfaces with untreated and NaOH-treated titanium surfaces.
• To assess the efficacy of hydrothermal treatment with CaCl(2) for enhancing bone integration.

Main Methods:

• Commercially pure titanium cylinders were prepared into three groups: untreated, NaOH+heat treated (NaOH+hTi), and hydrothermally treated with CaCl(2) (Ca-Ti).
• Implants were surgically placed into defects in Wistar rat tibias.
• Histomorphometric analysis was performed on retrieved implants at 1, 2, and 4 weeks post-implantation.

Main Results:

• Ca-Ti implants demonstrated significantly higher bone contact percentages at all time points: 55.2% (1 week), 88.1% (2 weeks), and 96.1% (4 weeks).
• Untreated Ti showed bone contact of 5.7% (1 week), 19.9% (2 weeks), and 57.4% (4 weeks).
• NaOH+hTi implants showed bone contact of 27.2% (1 week), 70.9% (2 weeks), and 96.0% (4 weeks), comparable to Ca-Ti at 4 weeks.

Conclusions:

• Hydrothermal treatment of titanium with CaCl(2) yields a bioactive Ca-Ti surface.
• The Ca-Ti surface promotes significantly greater bone formation and osseointegration compared to untreated titanium.
• Ca-Ti surfaces show comparable bone integration to NaOH+heat treated surfaces by 4 weeks, suggesting a highly effective method for enhancing implant osseointegration.