The Role of Attached Gingiva in Long-Term Peri-Implant Tissue Stability

Two implants placed in the same jaw, by the same clinician, on the same day, can look identical at the point of restoration and diverge substantially over a decade. One stays quiet. The other develops recurring tenderness, bleeding on brushing, gradual recession and eventually bone loss.

One of the more consistent explanations for that divergence is the nature of the gum tissue around them. Specifically, whether there is a band of firm, keratinised tissue bound to the underlying bone — attached gingiva — or whether the implant emerges through loose alveolar mucosa that moves whenever the lip or cheek moves.

It is an unglamorous detail, and it is not the only factor, but it is one that is planned for at the surgical stage or not at all.

Keratinised attached gingiva is the pale pink, stippled, firm tissue that sits immediately around the necks of teeth and extends a few millimetres before changing character. Two properties define it:

• It is keratinised — the surface epithelium has a tough keratin layer, comparable in principle to the outer layer of skin, which resists mechanical and chemical insult.

• It is attached — the connective tissue beneath is bound to the periosteum and underlying bone, so it does not move independently.

Alveolar mucosa is the redder, thinner, shinier tissue further from the teeth. It is non-keratinised, more permeable, richer in blood vessels, and mobile — it slides over the bone and moves with the lip and cheek. It is well suited to lining a cheek and poorly suited to forming a stable seal against an implant.

The line between them is the mucogingival junction, and its position relative to the implant is what determines whether the implant emerges through stable or mobile tissue.

A natural tooth has a periodontal ligament. Beyond holding the tooth in bone, the ligament carries a rich blood supply and a population of cells with reparative potential, and the connective tissue fibres of the gum insert into the tooth's cementum perpendicular to the surface — a genuine attachment.

An implant has none of this. It is ankylosed directly to bone with no ligament, and the connective tissue fibres around it run largely parallel to the implant surface rather than inserting into it. The result is a seal that relies more on the epithelial attachment and on tissue quality, with a poorer blood supply and less capacity to resist a bacterial challenge. Our article on biological width around implants sets out the dimensions of that seal.

Against that background, the character of the surrounding tissue carries more weight than it does around a tooth:

Cleaning tolerance. This is arguably the most practically important effect. Brushing at the margin of a tooth or implant surrounded by mobile, non-keratinised mucosa is frequently uncomfortable, and patients naturally clean the area less thoroughly. Less cleaning means more plaque; more plaque means inflammation. A band of firm keratinised tissue is comfortable to brush, and the area is therefore cleaned properly. The tissue does not prevent disease directly so much as it makes the behaviour that prevents disease sustainable.

Marginal stability. Mobile tissue at the implant margin is pulled by every movement of the lip and cheek. That repeated traction at the tissue–implant junction is a plausible contributor to the gradual recession seen at some implant sites.

Resistance to insult. Keratinised tissue tolerates mechanical and chemical challenge better than non-keratinised mucosa does.

Aesthetics. In the visible zone, firm keratinised tissue holds a stable, natural contour. Mobile mucosa is thinner, redder and more likely to show the underlying abutment or the metal of the fixture. Our article on how gum shape affects implant results covers the appearance side.

The evidence base here is worth representing accurately. Studies do not show that implants without keratinised tissue inevitably fail — many function well for years. What the evidence more consistently shows is more plaque, more bleeding on probing, more discomfort during brushing, and more recession at sites with little or no keratinised tissue. It is a risk factor and a comfort factor rather than a requirement.

The tissue that was there beforehand. Some people naturally have a broad band of keratinised tissue; others have very little, particularly on the tongue side of the lower jaw.

Long-term tooth loss. As the ridge resorbs after extraction, the band of keratinised tissue narrows and the mucogingival junction effectively migrates towards the crest. Long-standing edentulous ridges — particularly under dentures — frequently have minimal keratinised tissue remaining. Our article on ridge preservation after extraction covers the bone side of the same process.

Previous periodontal disease and surgery. Both can reduce the available band.

Flap design at placement. How the incision is made and how the flap is repositioned determines where the keratinised tissue ends up. A crestal incision with careful repositioning can distribute the existing band to both sides of the implant. This is a planned decision at surgery, not an incidental one.

Second-stage surgery. Where implants are uncovered in a second procedure, that is a further opportunity to reposition tissue advantageously — often by an apically repositioned flap or a roll technique.

Restoration contour. The emergence profile of the crown influences how the tissue sits against it. An over-contoured restoration presses on the tissue and is harder to clean.

Free gingival graft. A thin layer of keratinised tissue including its epithelium is taken from the palate and placed at the site. The graft keeps its keratinised character, which is the point. It reliably widens the band, though the colour and texture match is imperfect — so it is used more readily in non-visible areas.

Connective tissue graft. Subepithelial connective tissue is taken from the palate and placed beneath the existing tissue. This thickens the tissue and gives a better aesthetic blend, which makes it the more common choice in the visible zone, though it is less reliable at increasing keratinised width specifically.

Soft tissue substitutes. Collagen matrices avoid the need for a palatal donor site and reduce discomfort. Outcomes are reasonable, though for pure keratinised width increase the free gingival graft remains the more predictable option.

Apically repositioned flap. Where a band of keratinised tissue exists but sits in the wrong position, repositioning it may suffice without a graft.

Timing. Grafting is generally more straightforward before or at implant placement, or at second-stage surgery, than around a restored implant where access is limited. This is one reason the assessment belongs in the planning phase.

Daily cleaning. Inflammation is the primary driver of tissue breakdown. Peri-implant mucositis is reversible; peri-implantitis with bone loss largely is not. Our articles on spotting early peri-implantitis and identifying peri-implantitis symptoms cover the signs.

Appropriate tools. Soft brushes, single-tufted brushes for the margin, and interdental brushes sized to the space. Our articles on interdental brushes versus floss around implants and electric toothbrushes on implants cover technique.

Not over-brushing. Force does not clean better and does damage the margin. Our article on whether brushing harder cleans better covers this.

Professional maintenance at appropriate intervals, with probing, monitoring of tissue width and radiographs where indicated.

Not smoking. The most significant modifiable risk factor for peri-implant disease.

If an implant site is tender to brush, bleeds routinely, has visibly red and shiny tissue at the margin, or the tissue appears to be moving away from the restoration, it is worth assessing. Peri-implant problems are frequently symptomless until they are advanced, which is why scheduled monitoring rather than symptom-led attendance is the approach. Our article on sore gums around an implant covers the presentation.

• Attached gingiva is keratinised and bound to bone; alveolar mucosa is non-keratinised and mobile.

• Implants lack a periodontal ligament, so the peri-implant seal is weaker than around a tooth.

• Adequate keratinised tissue mainly works by making the margin comfortable enough to clean properly.

• Absence of keratinised tissue is associated with more plaque, bleeding, discomfort and recession — not with inevitable failure.

• Long-term tooth loss and denture wear reduce the keratinised band.

• Flap design at placement and at second stage strongly influences the outcome.

• Grafting is more predictable before or during implant surgery than afterwards.

What is attached gingiva?

It is the firm, pale pink, keratinised gum tissue immediately around teeth and implants that is bound down to the underlying bone. It differs from the redder, mobile alveolar mucosa further away, which moves with the lip and cheek.

Do I need attached gingiva around an implant?

It is not an absolute requirement, and implants without it can function well. It is, however, associated with more comfortable cleaning, less bleeding and less recession over time, so it is assessed and, where practical, provided for during planning.

Can attached gingiva be created if I do not have enough?

Yes, usually by grafting — a free gingival graft to widen the keratinised band, or a connective tissue graft to thicken the tissue where appearance matters. Soft tissue substitutes avoid a palatal donor site. Suitability depends on the site and the surrounding anatomy.

Is a gum graft around an implant uncomfortable?

It is carried out under local anaesthetic. Where tissue is taken from the palate, the donor site is usually the more noticeable part of recovery for the first week or so, and it is covered with a dressing. Post-operative instructions and pain relief advice are provided.

How do I know whether I have enough around my implants?

It is measured clinically — the width of keratinised tissue is recorded, and tissue mobility is assessed. This forms part of implant maintenance appointments rather than something visible to you.

Can lack of attached gingiva cause my implant to fail?

Not directly. The chain is indirect: less keratinised tissue tends to mean cleaning is uncomfortable, which tends to mean more plaque, which drives inflammation and can lead to peri-implantitis with bone loss. Interrupting that chain at the cleaning stage is what matters most.

If you have implants and find the gum around one tender to clean, or have noticed the tissue changing, an assessment establishes what is happening and whether anything is needed.

You can contact our team at our Wimpole Street practice, or read about dental implants and gum disease treatment.

This article provides general information about peri-implant soft tissue and does not constitute individual dental advice. Whether soft tissue grafting is appropriate around a particular implant depends on tissue width and thickness, site anatomy and restorative factors, all of which require clinical assessment. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 16 September 2027