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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For which type of dental appliance would a vacuum former NOT be commonly used?

Mouth guard
Custom tray
Permanent crown
Night guard

The correct answer is: Permanent crown

A vacuum former is typically used to create custom-fitted dental appliances from thermoplastic materials, and it is effective for producing various types of appliances that require a precise fit to the patient's dental structures. Appliances like mouth guards, custom trays, and night guards benefit from this process as they require individualized shapes that conform closely to the patient's anatomy. However, when it comes to a permanent crown, a vacuum former is not commonly utilized. Permanent crowns are typically fabricated using materials such as porcelain, metal, or a combination of both, and the process involves dental laboratory techniques that include impressions, wax patterns, and casting rather than the shaping of thermoplastic materials through a vacuum former. The fabrication of crowns requires more complex methods, such as computer-aided design and manufacturing (CAD/CAM), or traditional techniques involving metal frameworks and ceramic layering, which are not suitable for a vacuum forming process. Therefore, the correct answer identifies the type of appliance that does not align with the function of a vacuum former.