Implant hygiene: peri-implant tissue defends itself less well than periodontal tissue

Hygiene around implants is often explained as though it were hygiene around natural teeth, and the biological difference makes that approach insufficient.

A natural tooth is connected to bone by the periodontal ligament, with fibres inserting perpendicularly into root cementum and forming a mechanical barrier to bacterial advance.

Around an implant those fibres do not exist. Collagen fibres run parallel to the implant surface, and the barrier consists almost solely of epithelial attachment.

Vascularity is also reduced, because the supply from the ligament is missing. The result is a tissue with lower defensive and reparative capacity.

The clinical consequence is that peri-implant inflammation advances towards bone more rapidly than periodontal inflammation, and the window for intervention is narrower.

Peri-implant mucositis is the reversible stage: soft tissue inflammation without bone loss. Treated, it resolves; neglected, it progresses to peri-implantitis, which entails bone loss and is not reversible.

Bleeding on probing is the sign that distinguishes the two stages and the reason periodic review is not optional. The patient does not perceive mucositis, because it does not hurt.

Aids must be chosen with attention to material. Interdental brushes with an exposed metal core can scratch titanium, and the grooves retain more plaque than a smooth surface.

Brushes with a nylon- or plastic-coated core are preferred, and titanium or fibre instruments for professional debridement, avoiding steel curettes on exposed implant surfaces.

Floss should be used with caution. Some techniques call for hugging the abutment in a C shape, but floss forced beneath the margin can tear the epithelial attachment, which is the only barrier present.

The water flosser has better evidence in this setting than elsewhere, because it reaches difficult areas without traumatic contact. It is one of the few cases where it can be recommended as a principal rather than adjunctive aid.

The condition that makes all this possible is the prosthetic design. A superstructure with convex profiles, polished surfaces and accessible spaces can be cleaned; one with concavities and undercuts cannot be cleaned by any instrument.

In summary: peri-implant tissue has reduced defences and inflammation advances faster, mucositis is reversible and must be actively sought, aids must not scratch titanium, and cleanability is decided at the design stage.