National Dental Assisting Examining Board (NDAEB) Practice Exam

What is the primary purpose of final impressions in dentistry?

1. To create study models

2. To produce a master cast

3. To fabricate temporary restorations

4. To enhance occlusion

The correct answer is: To produce a master cast

The primary purpose of final impressions in dentistry is to produce a master cast. This master cast serves as a precise replica of a patient's oral structures, which is crucial for the fabrication of various dental prosthetics, such as crowns, bridges, dentures, and other restorations. Final impressions capture the detailed anatomy of the prepared teeth, surrounding structures, and occlusal relationships, ensuring that the dental appliance fits accurately and functions properly. The quality of the final impression directly influences the effectiveness and comfort of the resulting dental restoration. While study models may also be created using preliminary impressions, final impressions are specifically designed to give the clinician the detailed information needed for the definitive cast. This distinction is important, as it emphasizes the role of final impressions in achieving the necessary precision required for successful dental restorations.