Surface characterizations of variously treated titanium materials.

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Dental Implantology

Background:

• Cell attachment to titanium surfaces is critical for clinical implant dentistry.
• Optimizing titanium implant surfaces promotes favorable cellular and tissue responses.
• Surface modification techniques are employed to enhance implant performance.

Purpose of the Study:

• To investigate the relationship between surface roughness (Ra) and contact angle (theta) on engineered titanium surfaces.
• To analyze these relationships across commercially pure titanium, Ti-6Al-4V, and TiNi alloys.
• To understand the role of surface oxide crystallography in cell attachment.

Main Methods:

• Engineered titanium surfaces of CP-Ti, Ti-6Al-4V, and TiNi were prepared.
• Contact angles were measured using distilled water, saline, neutrophils, and osteoblast-like cells.
• Surface oxide crystallography was analyzed using transmission electron diffraction.

Main Results:

• No significant differences in contact angles were observed across the four tested media.
• Commercially pure titanium treated with a combined method exhibited the lowest contact angle (10.51° in water).
• A linear correlation between contact angle and surface roughness was found, dependent on oxide type (rutile vs. rutile/anatase mix) and hydrophilicity/hydrophobicity.

Conclusions:

• Surface roughness and oxide crystallography significantly influence the wettability of titanium alloys.
• Hydrophilic surfaces (theta < 45°) with mixed rutile/anatase oxides show decreased contact angle with increased roughness.
• Hydrophobic surfaces (theta > 45°) with only rutile oxide show increased contact angle with increased roughness, impacting cell attachment.