National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Which gypsum product is known for its ability to withstand extreme heat?

Investment material
Regular gypsum
Stone
Hydrocal

The correct answer is: Investment material

Investment material is specifically formulated to endure extreme heat, making it ideal for situations like casting metal alloys in dental practices. It is designed to withstand high temperatures without significant change in form or integrity, which is essential when metals are melted and poured into molds to create dental restorations. This characteristic ensures that the investment material accurately retains the details of the impression and provides a precise casting. In contrast, regular gypsum and products like stone and Hydrocal are not engineered to handle the high temperatures required during the casting process. Regular gypsum tends to break down under heat, and while stone and Hydrocal have better strength and density than regular gypsum, they still cannot approach the thermal resistance of investment materials. Therefore, investment material remains the most suitable choice when dealing with processes that involve extreme heat, such as the casting of metal dental restorations.