[Comparative surface microanalysis of Branemark implants which fail to osseointegrate]

Area of Science:

• Biomaterials Science
• Oral Implantology
• Surface Chemistry

Background:

• The success of osseointegration is influenced by implant surface properties.
• Understanding the host response to implant materials is crucial for clinical outcomes.
• Bränemark oral implants are widely used, necessitating detailed surface characterization.

Purpose of the Study:

• To comparatively analyze the surface topography, chemical composition, and oxide layer thickness of retrieved and control Bränemark oral implants.
• To investigate the correlation between implantation duration and surface changes.
• To identify potential factors contributing to osseointegration failure.

Main Methods:

• Scanning Electron Microscopy (SEM) for topographical analysis.
• X-ray Energy Dispersive Spectroscopy (EDS) for surface chemical composition.
• Auger Electron Spectroscopy (AES) for elemental analysis of the outermost monolayers and oxide layer thickness.
• Analysis of 16 retrieved implants (11 failed osseointegration) and 5 control implants.

Main Results:

• SEM revealed no significant topographical differences between retrieved and control samples.
• EDS indicated similar bulk composition (titanium with <0.5% other elements) in the outermost micron.
• AES showed increased oxide layer thickness with longer implantation times.
• AES detected significant differences in carbon and silicon levels on retrieved samples, suggesting contamination beyond statistical limits.

Conclusions:

• Implantation time influences oxide layer thickness but not overall topography or bulk composition.
• Contamination, particularly carbon and silicon, on retrieved implants exceeded established limits.
• Surface contamination, rather than inherent topographical or compositional differences, may be a factor in osseointegration failure.