What is the first step in taking a master impression for RPD?

The first step in taking a master impression for a removable partial denture (RPD) is to clean the teeth. This is crucial because any debris, plaque, or biofilm on the teeth can interfere with the accuracy of the impression. Cleaning ensures that the impression material can properly capture the details of the tooth surfaces and the surrounding tissues, which is essential for achieving a precise fit for the denture.

After cleaning the teeth, the procedure can continue with disinfecting the tray and injecting the impression material. However, without the initial step of cleaning, the quality of the impression would be compromised, leading to potential issues with the fit and function of the final prosthetic. Proper hygiene practices also play an important role in infection control, further emphasizing the importance of starting with a clean field before making an impression.