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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Which of the following describes a radiolucent restoration?

Metal
Composite
Acrylic
Amalgam

The correct answer is: Acrylic

A radiolucent restoration is a type of dental material that allows X-rays to pass through it, appearing darker on a radiograph. This characteristic is essential in differentiating between various types of dental materials, as it provides important information about the type of restoration present in the tooth. Acrylic, which is commonly used in various dental applications including temporary restorations and dentures, fits this description because it exhibits a degree of radiolucency. This means that, on an X-ray, acrylic will not attenuate the X-ray beam significantly, allowing for clearer visualization of the underlying tooth structure or any potential issues such as decay. The other materials listed do not exhibit this characteristic: metals, such as gold or silver, are dense and typically show up as radiopaque (lighter) on X-rays; composite resins may vary in their radiopacity but generally are not as radiolucent as acrylic; and amalgam is also radiopaque due to its metallic components. Understanding these distinctions is crucial for dental professionals when assessing radiographs to make informed decisions about diagnosis and treatment.