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.
For many years, partial dentures have been used to replace groups of teeth or a few teeth scattered across the lower or upper jaw. There are a variety of removable partial dentures available to patients and each one comes with its own set of benefits and disadvantages. All partial dentures attach to remaining teeth and have a gum–colored portion meant to blend into the existing gum, with prosthetic teeth to replace the missing teeth.
Extractions were the main cost saver ($30 each) but you have to pay for the dentures first ($500). Don't think they would have accepted me if I only wanted extractions. TOOK 5 MONTHS and 6 or 7 visits to get these "immediate" dentures. Look good out of my mouth but when I smile u see all the bottom teeth and hardly any top ones. LOTS of overbite make biting PB&J sandwich impossible.
