RPA is especially suitable for Kennedy Class I and II cases under which condition?

RPA is especially suitable for Kennedy Class I and II cases under which condition?

• A. Severe soft tissue undercut or shallow vestibule
• B. No undercuts
• C. Large open bite
• D. Posterior crossbite

Answer: (A)

RPA works well in Kennedy Class I and II when there is limited space for conventional tooth-supported retention because it relies on tissue support and palatal coverage rather than just clasps on teeth. In cases with severe soft tissue undercuts or a shallow vestibule, the proximal plates and the acrylic-covered palate engage those soft-tissue undercuts, providing retention and stability for the denture. This approach distributes forces through the mucosa and the palate, reducing dependence on deep vestibules or extensive tooth-based retention. If there are no tissue undercuts, simpler tooth-supported designs would typically be adequate, and the other options describe occlusal problems (large open bite or posterior crossbite) that aren’t the primary factors guiding this retention design.

RPA works well in Kennedy Class I and II when there is limited space for conventional tooth-supported retention because it relies on tissue support and palatal coverage rather than just clasps on teeth. In cases with severe soft tissue undercuts or a shallow vestibule, the proximal plates and the acrylic-covered palate engage those soft-tissue undercuts, providing retention and stability for the denture. This approach distributes forces through the mucosa and the palate, reducing dependence on deep vestibules or extensive tooth-based retention. If there are no tissue undercuts, simpler tooth-supported designs would typically be adequate, and the other options describe occlusal problems (large open bite or posterior crossbite) that aren’t the primary factors guiding this retention design.