National Dental Assisting Examining Board (NDAEB) Practice Exam

What should a dental assistant consider when creating models from impressions?

1. The temperature of the impression material

2. The strength of the gypsum used

3. The type of wax used for trimming

4. The initial viscosity of the impression material

The correct answer is: The strength of the gypsum used

When creating models from impressions, the strength of the gypsum used is crucial. Gypsum is the material typically used to pour models from impressions, and its strength determines how well the model can withstand the handling and any subsequent processes such as trimming or adjusting. Using a gypsum product with adequate strength ensures that the model is durable enough for fabrication processes such as constructing crowns, bridges, or dentures without easily chipping or breaking. Additionally, a stronger gypsum will provide a more accurate representation of the dental impression, preserving the fine details captured in the impression process, which is essential for achieving a proper fit and function in the final dental products. This makes the selection of gypsum a fundamental consideration for dental assistants when creating models from impressions.