Relines: postponing them costs more bone than the appointment saves

Resorption of the edentulous ridge does not stop. It continues for life, faster in the first months after extractions and then slowly but without interruption, and no denture prevents it.

This means a complete denture perfectly fitted at delivery becomes progressively ill-fitting, and that relining is not a repair but scheduled maintenance.

The point overlooked is that an unstable denture accelerates resorption rather than merely enduring it. Movement transmits non-physiological forces to the ridge, and overloaded zones resorb faster.

Postponing a reline to spare the patient an appointment therefore loses bone that does not return. It is the exact opposite of the saving it appears to be.

The signs indicating the need are recognisable. Reduced retention without any change in hygiene, sore spots appearing in new areas, recent phonetic difficulty, and visible denture movement during chewing.

Inflammatory hyperplasia at the borders is a late sign: it indicates the border has shifted through resorption and now traumatises the tissue chronically. At that point the tissue must be treated before relining.

Direct relining is performed chairside with self-curing resin. It is quick but has limitations: the reaction is exothermic, residual monomer can irritate the mucosa, and thickness control is difficult.

The most concrete risk is an unintended increase in vertical dimension: if the patient bites too hard on still-plastic material nothing happens, but if they do not bite hard enough the denture ends up a millimetre high, which the patient will feel.

Indirect relining, with a functional impression and laboratory processing, offers markedly superior material properties and no risk of chemical irritation. The patient is without the denture for some hours, and that is the only real drawback.

Soft relines have a specific indication: thin ridges with attenuated mucosa, where a rigid material causes pain. The material cushions the load and makes tolerable a situation that would otherwise be painful.

Their real lifespan must be communicated to the patient. Acrylic-based materials lose elasticity within months; silicones last longer but tend to detach at the borders and to be colonised by Candida, which adheres to these surfaces more than to acrylic.

Tissue conditioner serves a different, temporary purpose: it is applied to inflamed mucosa to allow healing before the definitive impression. It must be changed every few days and is not a reline.

In summary: relining is scheduled rather than awaited, indirect is preferable when time allows, and soft relines have a precise indication and a limited lifespan that must be stated. A denture that moves is not merely uncomfortable: it is consuming the bone it rests on.