Which statement about RPD retention is true?

Retention in removable partial dentures (RPDs) is a critical factor for their success and stability in the oral cavity. The correct assertion is that clasps and guide planes are essential components for achieving retention. Clasps are metal components that engage the remaining natural teeth to provide retention and stability, helping to prevent the RPD from being dislodged during function. Guide planes, which are areas on the teeth that are intentionally prepared to guide the RPD into place, also enhance retention by helping the partial denture establish a predictable path of insertion and withdrawal.

While peripheral border seal can contribute to retention, it is not solely responsible, as it relies on other factors, including the fit of the denture base and the health of the residual ridge. Thick denture bases do not necessarily contribute to retention; in fact, unnecessarily thick bases can lead to discomfort and movement. Lastly, the partial denture base being short may lead to insufficient coverage and stability, which is contrary to the goals of achieving effective retention. Hence, the configuration of clasps and the design of guide planes are paramount for achieving a stable and retentive RPD.