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!

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What type of zinc phosphate cement is designed for precise castings?

Type 1
Type 2
Type 3
Type 4

The correct answer is: Type 1

Type 1 zinc phosphate cement is specifically designed for use with precise castings, such as those found in indirect restorations and prosthodontic applications. This type of cement demonstrates low film thickness, which is crucial for achieving a tight fit between the restoration and the tooth structure. The characteristics of Type 1 allow it to provide excellent adaptation to the casting surface, ensuring both retention and stability of the restoration. Moreover, Type 1 zinc phosphate cement has a specific powder-to-liquid ratio that influences its viscosity and strength, making it suitable for durable, marginal seals in cast restorations. Its ability to withstand thermal changes and provide adequate compressive strength when set further emphasizes its appropriateness for cementing castings in dental procedures. Understanding the distinctions between the different types of zinc phosphate cements is important for ensuring the right selection for various clinical scenarios.