Support is the principle that describes how well the underlying mucosa (oral tissues, including gums) keeps the denture from moving vertically towards the arch in question during chewing, and thus being excessively depressed and moving deeper into the arch. For the mandibular arch, this function is provided primarily by the buccal shelf, a region extending laterally from the back or posterior ridges, and by the pear-shaped pad (the most posterior area of keratinized gingival formed by the scaling down of the retro-molar papilla after the extraction of the last molar tooth). Secondary support for the complete mandibular denture is provided by the alveolar ridge crest. The maxillary arch receives primary support from the horizontal hard palate and the posterior alveolar ridge crest. The larger the denture flanges (that part of the denture that extends into the vestibule), the better the stability (another parameter to assess fit of a complete denture). Long flanges beyond the functional depth of the sulcus are a common error in denture construction, often (but not always) leading to movement in function, and ulcerations (denture sore spots).
There are several types of partial and full dentures. Complete dentures, also called full dentures, may be recommended when all teeth in the upper or lower jaw are missing. There are two options for complete dentures: immediate and conventional. Immediate dentures are made before the patient's teeth are removed and can be inserted as soon as the tooth removal surgery is complete.
Implant-Supported Overdentures: To increase the stability of a lower or upper denture, it's possible for it to be securely anchored using two or more dental implants. The upper jaw requires more implants (generally three or more) than the lower jaw due to a lesser bone density. Many people find this option offers a great balance of comfort, functionality and value.
An overdenture is a removable dental prosthesis that covers and rests on one or more remaining tooth roots. A removable partial denture is a dental prosthesis that replaces some teeth and is built around existing natural teeth. Both the overdenture and the removable partial denture may be connected to the remaining tooth roots or remaining natural teeth with anchors made of metal or plastic. These connections improve stability and the retention of both prostheses.
