The study, conducted by researchers at Rutgers School of Dental Medicine in the United States and published in the journal PNAS Nexus, examined why peri-implantitis, an infection that damages the bone surrounding dental implants, can be difficult to treat with antibiotics.
According to the findings published by ScienceDaily on October 23, 2026, between 10% and 20% of dental implant recipients develop the condition, which can eventually threaten the stability of the implant.
The researchers found that bacteria accumulating on titanium implant surfaces can form acidic layers that gradually corrode the metal, releasing tiny particles into surrounding gum tissue.
These particles can disrupt immune cells known as macrophages, which normally help the body fight infections.
When the particles enter the tissue, they attract bacterial toxins that cause macrophages to mistake them for harmful microorganisms.
However, because the immune cells cannot break down titanium, they remain trapped in a prolonged state of inflammation.
This response can damage the bone supporting the implant while reducing the immune system’s ability to eliminate the bacteria responsible for the infection.
Georgios Kotsakis, the study’s senior author and assistant dean for clinical research at Rutgers School of Dental Medicine, said the findings explain why treatments that work for infections around natural teeth may be less effective around dental implants.
“For the first time, we show why all the antibiotic treatments that work around teeth do not work around implants,” Kotsakis said. “Now that we know the cause, we can start developing therapeutics.”
The team also identified a calcium channel known as TRPC1, which plays a role in the inflammatory response triggered by titanium particles and bacterial toxins.
In experiments involving genetically engineered mice, researchers found that disabling the channel improved the immune response, reduced inflammation and helped the animals clear bacteria more effectively.
The findings suggest that targeting this pathway could lead to new treatments for peri-implantitis.
However, further research is needed before such therapies can be established as safe and effective for human patients.
The researchers are now evaluating potential drugs that target the same molecular pathway in human cells, with funding from the US National Institutes of Health.
The study also highlights the importance of proper dental implant care.
Researchers warn that some cleaning instruments can scratch titanium surfaces, potentially releasing additional particles and contributing to implant damage.
Regular professional cleaning using appropriate, non-abrasive techniques remains an important preventive measure for people with dental implants.
The findings provide a new explanation for why some implant-related infections are difficult to treat and could help scientists develop more effective approaches to protecting patients’ oral health.
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