Which feature helps ensure the retention of an RPD?

The feature that helps ensure the retention of a removable partial denture (RPD) is the clasp design and fit. Clasps are crucial components that engage with the natural teeth to provide stability and retention. Properly designed clasps allow the RPD to grip the abutment teeth securely, minimizing the potential for displacement during function. The fit of these clasps is equally important; a well-fitted clasp will adequately apply the right amount of tension without causing discomfort or damaging the abutment teeth.

Factors such as flexibility of the denture material or the quantity of components can influence the overall performance of the RPD, but they do not directly ensure retention. The color of the prosthetic teeth may have aesthetic significance but does not contribute to how well the denture stays in place. Hence, the design and fit of the clasps are fundamental for achieving adequate retention of an RPD.