What are the inherent problems with lower dentures?
1. The lower denture is constantly in contact with movable tissues and structures in the mouth. The two oral structures that move the most during normal activity are the tongue and those structures that lie below the tongue, called the floor of the mouth. During normal chewing, swallowing, and speaking, movement of the tongue and the floor of the mouth may significantly disrupt the stability of the lower denture. 2. The lower denture has less surface area for support. When compared to the upper denture that rests on the relatively broad and flat roof of the mouth, or palate, the lower denture must often rest on a thin, knife-edge ridge of bone. 3. As bone resorbs over time, the quality of support to be derived from the lower jawbone dramatically changes. For example, the lower jawbone ridge height is reduced, the quality of the gum tissues that overlie the lower jawbone deteriorates and becomes mobile and changing muscle and frenum attachments to the lower jawbone increasingly produce
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