NEWARK, N.J., US: In peri-implantitis cases that persist despite standard antimicrobial therapy, it is not clear what prevents the host response from resolving the disease. Implant-derived titanium particles have been implicated in peri-implant inflammation, but how they might contribute to persistent peri-implantitis has remained unclear. A new study from Rutgers School of Dental Medicine in Newark has investigated this gap and reports a mechanism that may help explain why antimicrobial therapy alone can be insufficient in some cases. The findings also hold clinical significance for dentists.
The study shifts attention from the microbial component of peri-implantitis to the implant surface. Bacterial biofilms can corrode titanium implant surfaces, releasing microscopic particles into the peri-implant tissue. Titanium particles can be released during maintenance if instruments intended for natural teeth are used on implants and during procedures used to treat established peri-implant inflammation. The researchers examined what these particles do after they enter peri-implant tissue. They found that the particles can interfere with macrophage function, reducing the ability of these immune cells to engulf and destroy bacteria and promoting a sustained inflammatory response associated with bone destruction.
“For the first time, we show why all the antibiotic treatments that work around teeth do not work around implants,” senior author Prof. Georgios Kotsakis, assistant dean for clinical research and director of research in the Department of Oral Biology at the dental school, said in a university press release. “Now that we know the cause, we can start developing therapeutics,” he added.
Once released into peri-implant tissue, titanium particles may attach to bacterial toxins and then be taken up by macrophages. Because the metal particles cannot be degraded, the cells may enter an overactive inflammatory state and become less effective at clearing bacteria. In laboratory experiments performed as part of the study, macrophages exposed to titanium particles took up substantially fewer bacteria than unexposed cells did.
“These particles are little magnets that attract bacterial toxin, and they hijack the immune system, preventing it from clearing bacteria,” Prof. Kotsakis noted.
The Rutgers group is now testing drug candidates that target the same pathway in human cells. If successful, such therapies could complement existing antimicrobial and mechanical approaches by modulating the inflammatory response rather than targeting bacteria alone.
For clinicians, the finding that titanium particle release can make peri-implantitis more difficult to resolve has direct significance for implant maintenance and peri-implantitis treatment. Instrumentation that damages implant surfaces may add to the biological process that treatment is intended to control. The study therefore adds mechanistic support for implant-specific maintenance protocols and careful instrumentation.
The study, titled “Implant-derived titanium particles impair macrophage bacterial clearance via TRPC1 and lysosomal dysfunction”, was published online in the April 2026 issue of PNAS Nexus.
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