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DANB's NELDA (NELDA) Practice Tests & Test Prep by Exam Edge - Free Test


Our free DANB's National Entry Level Dental Assistant (NELDA) Practice Test was created by experienced educators who designed them to align with the official Dental Assisting National Board content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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DANB's National Entry Level Dental Assistant - Free Test Sample Questions

With panoramic radiography, if a lead apron is used it should cover:

Correct Answer:
back and shoulders.


in panoramic radiography, the use of a lead apron is crucial for protecting patients from unnecessary radiation exposure. however, the placement of the lead apron is equally important to ensure both safety and the quality of the radiographic image. the correct positioning for a lead apron during a panoramic x-ray is to cover the patient’s back and shoulders.

the rationale behind this specific positioning is tied to the mechanics of panoramic x-ray machines, which capture a comprehensive view of the facial bones, teeth, and jaws in a single image. the x-ray beam travels in a semicircular motion around the head. therefore, any lead protection placed in front of the chest or above the shoulders can interfere with the path of the x-ray beam, potentially causing artifacts or distortions in the final image. these distortions could obscure critical diagnostic information.

lead aprons designed for use in panoramic radiography typically do not have a thyroid collar or any extension above the collar level because such additions can block the x-ray beam as it projects images from one side of the jaw to the other. this is particularly important in dental radiography where clarity and detail are essential for accurate diagnoses.

furthermore, it is essential to ensure that the lead apron extends down to cover the torso and potentially the lap, depending on the length of the apron. this coverage helps protect the major organs from scatter radiation, which can be a concern even with the relatively low levels of radiation used in dental x-rays. properly positioning the apron to cover the back and shoulders while avoiding the neck and chest ensures optimal patient protection and image quality during panoramic radiography.