What is the main difference between immediate and delayed RPDs?

The main difference between immediate and delayed removable partial dentures (RPDs) lies in the timing of their placement in relation to tooth extraction. Immediate RPDs are specifically designed to be placed in the mouth right after the extraction of teeth. This approach provides immediate esthetic and functional support to the patient, helping to maintain their oral health and maximize comfort during healing.

By obtaining a dental impression prior to extraction, the denture can be fabricated to fit the edentulous space as soon as the extraction occurs. This not only serves immediate cosmetic needs but also aids in preserving the oral tissues and facilitating a smoother transition during the healing phase.

In contrast, delayed RPDs are not placed until healing has occurred after the extraction, which typically means waiting for the tissues to stabilize and reshape. This timing allows for a more accurate fit based on the final contours of the healed ridge but does not provide the immediate benefits that come with an immediate RPD.

The other options regarding costs or material types do not accurately reflect the distinguishing factors of immediate and delayed RPDs, reinforcing why the timing of placement is the critical aspect to understand.