When dentures no longer fit well, the correct action is to seek follow-up care. Denture adhesive is recommended for dentures, even well fitting ones. Adhesives improve retention, seal the borders to prevent food from slipping under, and cusion the soft tissues from the rigid acrylic. Using denture adhesive may improve the fit, but it tends to work best when only a small amount is used. Covering the entire denture fitting surface in adhesive makes it stay in less well. Adhesives may compensate for gradual loosening of a denture, but it is only a temporary solution; it does not solve the problem. Fortunately, dentures can often be relined with relining materials to improve the fit, and this process costs less than creation of new dentures. Overall, a well-made denture could last about 5 years (or more), but this is different for every patient.
Removable partial dentures usually consist of replacement teeth attached to pink or gum-colored plastic bases. Depending on your needs, your dentist will design a partial denture for you. A partial denture may have a metal framework and clasps that connect to your teeth, or they can have other connectors that are more natural looking. In some cases, a removable partial denture is made to attach to your natural teeth with devices called precision attachments. Precision attachments are generally more esthetic than clasps.
Retention is the principle that describes how well the denture is prevented from moving vertically in the opposite direction of insertion. The better the topographical mimicry of the intaglio (interior) surface of the denture base to the surface of the underlying mucosa, the better the retention will be (in removable partial dentures, the clasps are a major provider of retention), as surface tension, suction and friction will aid in keeping the denture base from breaking intimate contact with the mucosal surface. It is important to note that the most critical element in the retentive design of a maxillary complete denture is a complete and total border seal (complete peripheral seal) in order to achieve 'suction'. The border seal is composed of the edges of the anterior and lateral aspects and the posterior palatal seal. The posterior palatal seal design is accomplished by covering the entire hard palate and extending not beyond the soft palate and ending 1–2 mm from the vibrating line.
