What should be done to ensure that the undercut areas are effective for RPD retention?

Creating effective undercut areas for RPD retention is crucial for ensuring that the denture remains securely in place during function. The best approach involves using a tapered bur to create elongated depressions. This method is effective because it shapes the tooth surface in a way that allows the denture's clasps to engage properly with the undercut areas. The tapered design of the bur permits the creation of undercuts that are deeper at the entrance but shallower towards the base, helping to secure the clasp into the undercut for optimum retention.

In contrast, relieving the entire surface would not enhance retention but rather potentially compromise the fit and stability of the RPD. Buffing the surface with a polishing tool does not create the necessary geometric features required for retention, and while increasing enamel thickness may seem beneficial, it does not create the specific undercut needed for clasp engagement. Therefore, the use of a tapered bur is the most effective technique to ensure that undercut areas can provide the necessary retention for a removable partial denture.