Tissue displacement is needed to expose which surfaces?

Tissue displacement is a critical technique used in prosthetic dentistry, particularly during the impression-taking process for removable partial dentures or complete dentures. The key purpose of tissue displacement is to adequately expose the prepared surfaces that will be instrumental for the fabrication of dental prosthetics.

When taking impressions, it is essential to displace the surrounding soft tissues effectively. This allows for a complete and detailed representation of the prepared surfaces, ensuring that all necessary contours and anatomical features are captured accurately. By doing this, ample space is created, allowing for the correct fit and function of the prosthetic devices.

In the context of the choices available, tissue displacement serves to expose both prepared surfaces—where dental preparation for prosthetics has taken place—as well as unprepared surfaces in proximity to those areas, ensuring that the entire arch or edentulous ridge can be recorded in relation to the surrounding tissues. This comprehensive capture is crucial for achieving optimal results in prosthetic design and functioning. Therefore, the correct choice reflects the necessity of displacing tissue to expose and accommodate both surfaces necessary for creating accurate impressions in prosthetic dentistry.