How does the lab minimize abrasion or damage to the RPD master cast?

The correct approach for minimizing abrasion or damage to the removable partial denture (RPD) master cast is through the process of making a duplicate cast for fitting. This technique allows for the creation of a secondary cast that is used for constructing the RPD without putting stress or wear on the original master cast.

The master cast is often delicate and carries critical details regarding the anatomy and occlusion of the patient’s mouth. By using a duplicate for fitting and for the actual denture fabrication, the master cast remains intact and preserved. This is essential for ensuring accuracy in the final prosthesis and maintaining the integrity of the original cast for any necessary adjustments or future procedures.

Utilizing a duplicate cast not only protects the master cast but also allows the lab technician to accurately fit the RPD, ensuring proper function and comfort for the patient throughout its use.