A study from the University of Gothenburg found titanium micro-particles in the oral mucosa around dental implants in all 21 patients examined, regardless of whether the implant showed signs of inflammation. Published in Communications Medicine, the research used tissue samples taken from both healthy implants and those affected by peri-implantitis, with each patient acting as their own control. Particle density varied between patients but not between healthy and inflamed sites within the same individual.

The findings extend earlier research that linked titanium particles primarily to inflamed peri-implant tissue. Researchers used the µ-PIXE imaging method, developed at Uppsala University, to map particle distribution within the tissue samples. They identified 14 genes with altered expression in samples containing higher titanium concentrations, particularly genes associated with inflammation and wound healing.

Whether the particles directly influence the local immune response or whether gene expression differences reflect individual variation in inflammatory conditions remains unclear. The researchers suggest particles are likely released during surgical placement, when the implant is inserted into the prepared bone canal. They note that surface structure differs between implant systems and may affect how many particles are deposited, making implant design a relevant factor for future research. Clinicians are advised that there is currently no cause for alarm, but long-term tissue behaviour warrants further investigation.