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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In a two-step impression technique, what is done before seating the heavy body impression material?

  1. The tray is pre-warmed

  2. The syringe material is placed around the tooth

  3. The base material is mixed

  4. The model is positioned

The correct answer is: The syringe material is placed around the tooth

In a two-step impression technique, placing the syringe material around the tooth is a critical step that ensures accurate and detailed impressions of the prepared tooth or area being treated. This technique generally involves first applying a more fluid impression material, often referred to as the wash or syringe material, into the sulcus or around the tooth. This allows for precise capture of fine details, such as the margins of the preparation or any adjacent tooth structures. Once the syringe material is adequately placed, the heavier body impression material can be applied. This two-step method allows for a more accurate final impression, which is crucial for producing well-fitting restorations. The initial application of the syringe material effectively captures the intricate contours and details of the teeth and gums, while the heavy body material that follows fills in the broader areas, providing stability and reducing distortion. This method enhances the fidelity of the impression, which is essential for the fabrication of dental prosthetics, ensuring that they fit correctly and function effectively in the patient’s mouth.