How do tissue-supported RPDs primarily gain support?

Tissue-supported removable partial dentures (RPDs) primarily gain support from the mucosa, which is an essential aspect of their design and functional capabilities. The mucosa serves as the primary foundation for these types of dentures, distributing the functional loads and providing stability during use.

In a tissue-supported RPD, the base of the denture rests against the oral mucosa, ensuring that the weight and functional forces from chewing and other movements are adequately managed by the soft tissues. This relationship not only assists in the retention of the denture but also enhances patient comfort by allowing the forces to be distributed over a larger area of the mucosa.

While other structures, such as existing teeth or a metal framework, may play important roles in the overall support of a denture, they are not the primary source of support for tissue-supported RPDs. The design emphasizes the role of soft tissue in not just supporting but stabilizing the appliance, making proper tissue contour assessment and adaptation a critical component in the successful fit and function of these dentures.