Share
Key takeaways
- The spectrum has 3 phases: healthy implant, peri-implant mucositis (no bone loss), and peri-implantitis (progressive bone loss).
- Mucositis is the only phase considered reversible, and only when caught and treated early by a professional.
- Peri-implantitis is graded early, moderate, or advanced based on how much supporting bone is lost.
- Severity rests on 3 measurements: bleeding on probing, probing depth (often 6 mm or more), and bone loss on a radiograph or CBCT scan.
From a healthy implant to peri-implant mucositis
A healthy implant sits in firm, pink gum tissue. It does not bleed when a dentist runs a probe gently around it, there is no pus, and the probing depth stays shallow and stable over time. The bone level on a radiograph holds steady year to year. This is the baseline every check-up is measured against.
The first shift along the spectrum is peri-implant mucositis. Here the gum around the implant becomes inflamed. The classic sign is bleeding on gentle probing. You may also notice redness, slight swelling, or tenderness when you brush. The defining feature is what is absent: there is no loss of the supporting bone yet. The inflammation is confined to the soft tissue.
This matters because mucositis is widely viewed as reversible. Caught early and managed by a professional, the gum can settle back to health. Left alone, it can progress to the next phase. If you want to know what to look for between visits, see our guide on the signs of unhealthy gums around an implant. Spotting trouble early is the whole point, because the reversible window is narrow.
The three grades of peri-implantitis
Peri-implantitis begins when inflammation is joined by progressive loss of the bone that holds the implant. Once bone is gone, it does not grow back on its own. This is why peri-implantitis is treated as a more serious condition than mucositis, and why dentists watch implants so closely.
Clinicians describe peri-implantitis along a severity scale, commonly labeled early (slight), moderate, and advanced. The grade reflects how much of the supporting bone has been lost relative to the implant. Early peri-implantitis shows limited bone loss near the implant neck. Moderate cases show bone loss extending further down the implant. Advanced cases show extensive bone loss, which can leave the implant loose and at risk of failure.
These grades are a snapshot of severity, not a fixed timetable. Progression speed varies from person to person and depends on plaque control, smoking, history of gum disease, and other factors. The grades describe how far the disease has gone, not how fast it will move next. For the full staging timeline and what care looks like at each grade, link up to Peri-implantitis treatment, which is where the management ladder belongs.
How dentists gauge severity
Staging is not guesswork. It rests on a few objective measurements a dentist repeats at each visit, then compares against your baseline.
First is bleeding on probing. A gentle pass with a probe should not draw blood from a healthy implant. Bleeding, or pus, signals active inflammation. Second is probing depth, the millimeter reading of how deep the pocket around the implant is. Shallow and stable is the goal. Established peri-implantitis often shows depths of 6 mm or more. Third, and the dividing line between mucositis and peri-implantitis, is bone loss. This is read on a radiograph, and a CBCT scan gives a more complete three-dimensional picture of the bone defect than a flat x-ray can.
Together these tell the dentist which phase you are in and, over repeated visits, whether things are stable, improving, or worsening. Seeing the contrast across a course of professional care can be striking; our piece on before and after periodontitis treatment shows how the same measurements track the soft tissue response in the closely related gum condition. The figures only mean something when they are tracked over time by a professional, not read once in isolation.
A note on collagen and silicon. Gum tissue is rich in collagen. ch-OSA® delivers bioavailable silicon that is thought to support the body's own collagen formation in general. It is an adjunct to discuss with your periodontist, never a treatment for peri-implantitis.