NDAEB Exam Prep Final 2024 real questions and answers

NDAEB Exam Prep Final 2024 real questions and answers What two basic methods are used to acquire a digital x-ray image? - CORRECT ANSWER-Direct imaging(sensor) & indirect imaging(PSP) Advantages of Digital Radiography - CORRECT ANSWER-Immediate viewing of images, less radiation, no chemicals, ability to enhance images, communication with other dentists, no more lost films, remote consultation capability Disadvantages of Digital Radiography - CORRECT ANSWER-Cost, converting previous records to digital, learning the computer software, thickness and rigidity of sensors, infection control What is intraoral film composed of? - CORRECT ANSWER-Film Base - Clear Cellulose Acetate Thin Adhesive Layer Silver Halide Crystals - absorb radiation A protective layer to protect the emulsion surface. What is a latent image? - CORRECT ANSWER-The image on the film that is not yet visible because it has not been processed. What does 'film speed' refer to? - CORRECT ANSWER-The amount of radiation that is required to produce a radiograph of standard density. True or false: The larger the silver halide crystals, the faster the film speed? - CORRECT ANSWER-True What is the fastest film speed currently available? - CORRECT ANSWER-F-Speed. (It reduces patient exposure to radiation by 20-60% compared to E or D speed film) What are the 3 types of x-ray film used in dental radiography? - CORRECT ANSWERIntraoral film, extraoral film, and duplicating film. When does a "Herringbone" pattern occur on dental film? - CORRECT ANSWER-When it is placed in the mouth backwards. What are the 5 basic sizes that intraoral film comes in? - CORRECT ANSWER-Child Size: 0 Narrow Anterior: 1 Adult Size: 2 Preformed bitewing: 3 (infrequently used) Occlusal: 4 What are two common extraoral radiographs taken? - CORRECT ANSWER-Panoramic and Cephalometric. What is an intensifying screen? - CORRECT ANSWER-A device that intensifies or increases the effect of radiation and thus decreases the amount of exposure time needed. It is coated with phosphor which gives off light when struck by x-radiation. What are the 5 steps in processing film? - CORRECT ANSWER-1. Developing (reduce the silver halide crystals into black metallic silver) 2. Rinsing (remove developer from film) 3. Fixing. (use an acidic solution to remove unexposed silver halide crystals) 4. Washing (wash the film) 5. Drying What are the two techniques that can be used for exposing intraloral images? - CORRECT ANSWER-Bisecting & Paralleling 5 Basic Rules of the Paralleling Technique - CORRECT ANSWER-1. Placement: it must cover correct teeth to be examined 2. Position: it must be parallel to the long axis of the tooth. 3. Vertical Angulation: Central ray must be directed perpendicular to the receptor & tooth. 4. Horizontal Angulation: Central ray must be directed through the contact areas. 5. Central Ray: it must be centered on the receptor. Why is it important to have an 'exposure sequence' for receptor placement? - CORRECT ANSWER-To ensure an area is not omitted or exposed twice. What occurs if the horizontal angulation is incorrect? - CORRECT ANSWEROverlapping of teeth. What two errors can occur if the vertical angulation is incorrect? - CORRECT ANSWERForeshortened or elongated images. What qualities must an endodontic x-ray have? - CORRECT ANSWER-Tooth centered on the image At least 5mm of bone visible beyond apex of the tooth The image is as anatomically accurate as possible Two methods of mounting radiographs are: - CORRECT ANSWER-1. Labial mounting method: radiographs placed in the mount with the raised