X-ray absorption fine structure (XAFS) analysis of titanium-implanted soft tissue.

Area of Science:

• Biomaterials Science
• Materials Science
• Analytical Chemistry

Background:

• Titanium (Ti) dental implants are widely used due to their biocompatibility.
• Understanding the chemical state and fate of Ti particles transferred to surrounding tissues is crucial for assessing implant success.
• Previous studies have limited data on the chemical speciation of Ti within peri-implant tissues.

Purpose of the Study:

• To investigate the chemical state of titanium transferred from dental implants into surrounding human tissues.
• To determine if the presence of Ti in tissues correlates with dental implant failure.
• To evaluate the utility of X-ray absorption fine structure (XAFS) for analyzing trace elements in biological samples.

Main Methods:

• Tissue samples from around Ti dental implants (successful and failed) were excised.
• Titanium distribution was mapped using X-ray scanning analytical microscopy (XSAM).
• Fluorescence XAFS analysis was performed to determine the chemical states of Ti in the tissues.

Main Results:

• Titanium in the tissues was predominantly in a metallic state, consistent with surgical debris.
• Oxidized forms of Ti (anatase, rutile) were detected in some samples, either alone or mixed with metallic Ti.
• The presence of Ti in the surrounding tissue was not found to be a cause of implant failure.

Conclusions:

• Titanium debris from dental implant surgery is common in surrounding tissues but primarily metallic.
• The detected Ti in tissues does not appear to compromise implant survival.
• XAFS is a valuable technique for characterizing the chemical states of low-concentration elements in biological tissues.