7. To minimize a patient’s exposure to radiation, intensifying screens: a. Contain a coating that fluoresces when irradiated, further exposing the x-ray. b. Must be coated with calcium tungstate, which is more sensitive than rare-earth phosphors. c. Can be used with digital receptors but not with film receptors. d. Can be paired with any speed of film to achieve the same exposure. 8. Cone-cuts can result from: a. Incorrect pairing of intensifying screen type with film type. b. Improper film handling. c. Improper tube positioning or angulation. d. Overexposure of the film. 9. Reversing the intraoral film in the film positioning device so that the lead foil is close to the beam causes a: a. Cone-cut. b. Foreshortening effect.
14. The paralleling technique is preferred to the bisecting angle technique because it: a. Results in less distortion from foreshortening and elongation. b. Offers the benefit of magnification due to increased object-to-film distance. c. Is almost impossible to overexpose the film, which reduces the patient’s radiation exposure. d. Is more cost-effective and therefore a popular choice among dentists. 15. In contrast to amber safelights, ruby red safelights: a. Allow more visibility in the darkroom. b. Are safe for use with all types of x-ray film. c. Are usually placed about 4 ft from where films are being developed. d. Can affect high-speed film clarity. 16. When duplicating film is used, the emulsion side (usually pink) should be: a. Facing upward and toward the light source in the room. b. Facing either way because both sides of the film contain emulsion layers. c. Facing downward and toward the light source in the duplicating box. d. Under the original x-ray image with the emulsion side facing upward and toward the duplicating box. 17. When dental films are developed using automatic c. Developer, fixer, water, drying elements. d. Developer, drying elements, fixer, water. 18. The chemical in developing solutions that helps inhibit oxidation is: a. Hydroquinone. b. Ammonium thiosulfate. c. Acetic acid. d. Sodium sulfite. 19. The main active chemical in fixer solutions is: a. Hydroquinone. b. Ammonium thiosulfate. c. Sodium bicarbonate. d. Silver halide. 20. Proper film mounting is important: a. To avoid increasing patient exposure to radiation. processors, the correct sequence is: a. Fixer, water, developer, water. b. Water, fixer, water, developer. b. For double-loading intraoral film cassettes. c. To avoid cone-cuts in extraoral film projections. d. For consistent, standardized interpretation of x-rays.
c. Herringbone effect. d. Prolonged image. 10. Light films may be caused by: a. Film fog. b. Using old solutions. c. Overexposure. d. Collimation errors. 11. Film fog can be caused by: a. Scatter radiation. b. Static charges.
c. Increased exposure time of kilovoltage. d. Storage of the film in a cool, dark place.
12. Gag reflex in a patient is usually: a. Intentionally invoked in order to avoid the dental procedure. b. Diminished if the patient drinks a warm and soothing liquid. c. Caused by psychological or physiological factors. d. Indicative of the need for immediate conscious sedation. 13. In the dimple-down technique: a. The patient’s facial dimples are used as positioning landmarks. b. The dimple on the film should be on the mandibular side of all periapical films. c. The dimple on the film should be closer to the occlusal surfaces for bite wing x-rays. d. The dimple on the film should be facing the x-ray beam.
Course Code: DCA01RA
EliteLearning.com/Dental
Page 151
Powered by FlippingBook