An impression technique to make a new master cast for an existing removable partial denture

Area of Science:

• Dental Prosthodontics
• Removable Dental Prosthetics

Background:

• Master casts for removable partial dentures are crucial for fabrication.
• Loss of a master cast necessitates replacement, potentially compromising existing denture frameworks.
• Maintaining framework fit is essential for successful denture function.

Purpose of the Study:

• To describe a novel two-step impression procedure for replacing a lost master cast.
• To ensure accurate reproduction of a well-fitting removable partial denture framework.
• To maintain the passive fit of the denture framework on prepared rest seats.

Main Methods:

• A two-step impression technique was developed.
• The procedure integrates the altered-cast technique with a modified disposable impression tray.
• Continuous finger pressure on the major connector was applied during both impression stages.

Main Results:

• The described technique allows for the replacement of a lost master cast.
• Accurate impressions of the existing framework were obtained.
• Framework movement and loss of contact with rest seats were prevented.

Conclusions:

• This two-step impression method provides a viable solution for reproducing removable partial denture frameworks when the master cast is lost.
• The technique ensures the preservation of the fit and function of the existing denture framework.
• It offers a practical approach for clinicians facing lost master casts in removable prosthodontics.