ACADEMY FOR DENTAL ASSISTANTS

Size: px

Start display at page:

Download "ACADEMY FOR DENTAL ASSISTANTS"

Doris Brooks
6 years ago
Views:

1 ACADEMY FOR DENTAL ASSISTANTS 12 Week Dental Assisting Program Section 2 Quiz Chapter Exposure to radiation: a. no matter how small, has the potential to cause harmful biologic changes. b. has a threshold, below which exposure is entirely safe. c. is safer when there is a single, large dose rather than a series of smaller doses. d. from a dental x-ray machine does not involve particulate radiation and is completely safe. 2. In dentistry, the the wavelengths of the x-rays, the greater their energy and their usefulness. a. shorter b. longer c. more ionized d. straighter 3. The component of the x-ray machine that functions in positioning the tubehead is the: a. kilovoltage selector. b. control panel. c. extension arm. d. cathode. 4. The heart of the x-ray generating system is the: a. x-ray tube. b. insulating oil. c. transformer. d. position indicator device. 5. The term is used to describe areas that appear dark on the image; is the term used to describe areas that appear white or light gray. a. radiopaque; radiolucent b. radiolucent; radiopaque c. density; contrast d. contrast; density 6. The degree of density or blackness on an image is controlled by the: a. low-voltage circuit. b. kilovoltage. c. milliampere seconds. d. position indicating device. 7. A lead apron and a thyroid collar: a. are used for a full-mouth series of films but are not necessary for single periapical films. b. must be used on all patients for all exposures. c. are required for pediatric patients but is optional for adults. d. are mandated only for pregnant women. 1

2 8. The Guidelines for Prescribing Dental Radiographs issued by the American Dental Association and the FDA recommend which of the following dental imaging procedures for a pregnant patient? a. Do not take images of a pregnant patient. b. Radiographic imaging procedures do not need to be altered because of pregnancy. c. Take images only after the first trimester. 9. One of the rules of radiation protection is never stand closer than feet from the x-ray unit during an exposure unless you are behind a barrier. a. 2 b. 6 c. 10 d The portion of the x-ray machine that supplies the electrons to produce x-rays is the: a. cathode. b. anode. c. control panel. d. focusing cup. 11. If you change the exposure time of the x-ray unit, what is affected? a. Energy of the beam b. Wavelength of the x-rays c. Number of x-rays produced d. Penetrability of the x-rays 12. The penetrating power of the x-ray beam is controlled by the settings on the: a. impulse timer. b. kilovolt setting. c. milliamp setting. d. All of the above are correct. 13. Thermionic emission refers to the: a. release of electrons from the tungsten filament. b. ions formed in the x-ray tube by the loss of electrons. c. change in filament resistance due to heating. d. slamming of electrons against the target. 14. The lead collimator is used to: a. make the primary beam more accurate b. restrict the size and shape of the primary beam. c. remove long wavelengths. d. stop production of the primary beam. 15. How much filtration is federally required for a dental x-ray machine operating over 70 kvp? a mm b mm c mm d. 0.5 mm 2

3 16. Primary radiation is: a. also called the useful beam. b. the beam of x-rays that comes from the target. c. less penetrating than secondary radiation. d. both a and b. 17. The fuzzy or blurred area around an image is called. It can be reduced by. a. distortion; limiting movement b. a penumbra; limiting movement c. distortion; using fast film d. a penumbra; using fast film 18. The time lapse from x-ray exposure until noticeable damage occurs is known as: a. the latent period. b. chronic exposure. c. the cumulative period. d. none of the above. 19. Which of the following is less sensitive to x-rays and therefore not considered a critical organ? a. Skin b. Muscle c. Thyroid gland d. Lens of the eye 20. Who should hold the film in a patient s mouth if the patient is unable to do so? a. Receptionist b. Parent or relative of the patient c. Assistant d. Dentist 21. A patient is concerned with radiation exposure. You can assure him that your office uses the ALARA concept, which includes: a. reducing the number of exposures. b. minimizing retakes. c. keeping exposures levels as low as possible. d. all of the above. 22. If the operator s film badge indicates an exposure to small amounts of radiation, what should be done? a. Consult a physician. b. Ignore the report. c. Evaluate the x-ray equipment and techniques. d. Change the ma and kvp. 23. If a patient is small and petite, to get the same density radiograph it is best to reduce the: a. exposure time. b. ma. c. kvp. d. exposure time and ma. 3

4 24. The dentist says that the image has too much contrast; he would like to see more gray values. What adjustment would you make? a. Increase ma. b. Increase kvp. c. Decrease kvp. d. Decrease ma. 25. A good technique for reducing the radiation exposure to both patient and operator is the use of: a. a lead apron. b. thinner films. c. fast film or digital imaging. d. an automatic processor. 26. A radiograph that has an overall gray appearance is generally preferred. This radiograph is said to have: a. high density. b. low density. c. high contrast. d. low contrast. 27. How well the image reproduces fine detail or distinct outlines of an object is called: a. sharpness. b. magnification. c. density. d. contrast. 28. The location where x-rays are produced in the x-ray tube is called the: a. focal spot. b. filament. c. window. d. PID. 29. When the electrons slam against the target, are generated. a. 99% heat and 1% x-rays b. 1% heat and 99% x-rays c. 50% x-rays and 50% heat d. only x-rays 30. What happens when the exposure button is engaged? a. The high-voltage circuit is activated. b. Kilovolts drive the electrons to the target. c. Electrons slam against the target producing the x-ray. d. All of the above are correct. Chapter Dental film holders, used to position and hold the dental x-ray films in the patient s mouth, include: a. PID. b. XCP and disposable block. c. EeZee-Grip and EndoRay. d. both b and c. 4

5 2. The most commonly used film size for adult intraoral dentistry is size: a. #0. b. #2. c. #3. d. #4. 3. The extraoral film placed outside the mouth during x-ray exposure is: a. periapical. b. bite-wing. c. panoramic. d. occlusal. 4. A plastic or metal film cassette holds and protects the extraoral film. During exposure, the side of the cassette the must face the patient is the side. a. front b. back c. right d. left 5. The device that intensifies or increases the effect of the radiation and decreases the amount of exposure time needed when exposing an extraoral radiograph is a(n): a. screen film. b. film cassette. c. intensifying screen. d. nonscreen film. 6. hardens the film emulsion during film processing. a. Rinsing b. Developing c. Fixing d. Washing 7. Positioning instruments in digital radiography: a. assist in film placement. b. keep the patient s fingers from being exposed. c. should not be used. d. Both a and b are correct. 8. The purpose of the lead foil in the dental film packet is to: a. provide stiffness to the film. b. reduce film fogging. c. absorb the primary beam. d. make the packet more flexible and resilient. 9. When placing a dental film in the patient s mouth, the white side is placed the tube and the raised dot to the. a. toward; apical b. toward; occlusal or incisal c. away; apical d. away; occlusal or incisal 5

6 10. Solutions should have been changed in the processor 1 week ago. Continuing to use exhausted developer will result in films. a. dark b. light c. white d. Clear 11. The recommended distance between the safelight and where the films are unwrapped is: a. 2 feet. b. 4 feet. c. 6 feet. d. as close as possible. 12. The life of the processing solutions is affected by: a. the number of films processed. b. the time elapsed since last change. c. the size of films processed. d. all of the above. 13. When a film passes through fixer solutions before developing, the film will appear: a. clear. b. completely black. c. gray. d. yellowish-brown. 14. One reason for a lighter than normal radiograph is the: a. developer solution is too weak. b. developer solution is too warm. c. fixer solution is too weak. d. film was not properly rinsed. 15. When developer solution in an automatic processor is warmer than 83 F, the processed film will appear: a. dark or black. b. gray. c. clear. d. light. 16. Clear spots on a processed film can be caused by: a. static electricity. b. solutions are too warm. c. fixer contacts film prior to processing. d. drops of developer on a fixed film. 17. When loading the film into the cassette before exposure (in extraoral radiography), the: a. film comes preloaded in the cassette. b. procedure must be done in the darkroom. c. film may be placed in the holder outside the darkroom. d. film does not need an intensifying screen. 6

7 18. When film emulsion interacts with x-rays, the result is: a. a visible distortion. b. a distorted light source. c. a latent image. d. none of the above. 19. An extraoral dental x-ray film is: a. not sensitive to light. b. less sensitive to light than intraoral film. c. just as sensitive to light as intraoral film. d. more sensitive to light than intraoral film. 20. Digital radiography requires less radiation than traditional radiography because the: a. exposure time is increased. b. sensor is smaller. c. sensor is more sensitive to x-ray energy. d. sensor is attached to the computer. Chapter The Consumer-Patient Radiation Health and Safety Act is a federal law that requires all: a. persons who use x-rays to take dental images to be properly trained. b. persons who use x-rays to take dental images to be certified. c. dental x-ray machines to be registered. d. Both a and b are correct. 2. Dental images are the property of the: a. dentist. b. patient. c. patient s insurance company. d. dentist and the patient. 3. What should the dental assistant do if a patient refuses dental imaging? a. Document in the patient s record the fact that he or she refused recommended dental imaging. b. Explain to the patient the importance of dental imaging. c. Take the dental images anyway. d. Both a and b are correct. 4. The safelight in the darkroom can be tested by: a. using the coin test. b. turning off all the lights in the darkroom and looking for any white light. c. using a step wedge. d. taking a reference image. 5. The most critical component in film processing quality control is: a. processing two test films each day. b. maintaining the freshness of the processing solutions. c. maintaining the darkroom. d. checking the safelight. 7

8 6. Who is responsible for overall quality assurance in a dental practice? a. Dentist b. Dental assistant c. Dental hygienist d. Office manager 7. Regulations regarding certification for dental assistants in radiography: a. are not required by federal law. b. vary from state to state. c. do not exist. d. Both a and b are correct. 8. Which of the following must be disclosed to the patient before obtaining informed consent for dental radiographs? a. Risks and benefits of the images b. Person who will be exposing c. Consequences of not having images d. All of the above 9. Who can be held legally responsible for a dental assistant s actions? a. The dentist b. The dental assistant c. Both the dentist and assistant d. The patient 10. Calibration of dental x-ray equipment should be performed by: a. a dental assistant. b. a qualified technician. c. the dentist. d. all of the above. 11. Once films are removed from the mouth, they are considered contaminated and should be: a. given to the patient to hold. b. handled only with gloved hands. c. left on the counter in the operatory to accelerate exposure. d. heat-sterilized. 12. Sterilized positioning instruments should be removed from the packages: a. before the patient is seated. b. after the patient is seated. c. at any time. d. in the sterilization area. 13. Given normal use, processing solutions should be changed: a. once a day. b. once a week. c. every 3 to 4 weeks. d. annually. 8

9 14. An administrative quality control plan: a. ensures that each individual is trained to perform assigned duties. b. maintains a written description of the quality insurance plan. c. maintains records of control tests. d. does all of the above. 15. A record-keeping log for processing solution does not need to include the: a. date of solution replacement. b. date the tanks were cleaned. c. date of solution replenishment. d. name of the solution used to clean the tanks. Chapter The bitewing view is used for detecting: a. abscessed teeth. b. periodontal disease. c. interproximal decay. d. both b and c. 2. An intraoral full-mouth survey on an adult consists of images. a. 18 to 20 b. four c. 10 periapical and 2 bitewing d. four anterior images and eight posterior 3. What size film sensor is used for the anterior region of the mouth? a. #1 b. #2 c. #3 d. Both a and b 4. The technique is recommended by the American Academy of Oral and Maxillofacial Radiology and the American Association of Dental Schools, because it provides the most accurate image with the least amount of radiation exposure to the patient is the technique: a. bisecting-angle b. paralleling c. bitewing survey d. short-cone 5. To minimize image distortion, the: a. film must be positioned perpendicular to the long axis of the tooth. b. film must be positioned parallel to the long axis of the tooth. c. central ray of the x-ray beam must be directed parallel to the film. d. central ray of the x-ray beam must be directed parallel to the long axis of the tooth. 6. Incorrect horizontal angulation of the PID results in: a. elongation. b. foreshortening. c. blurred images. d. overlapped contact areas. 9

10 7. Incorrect vertical angulation can result in an image that is: a. elongated. b. foreshortened. c. overlapped. d. both a and b. 8. Because of the curvature of the arch, a total of bitewing views are taken on an adult patient. a. two b. four c. six d. Eight 9. Radiographic images on an edentulous patient might be required for: a. detection of interproximal caries. b. identifying objects embedded in the bone. c. detecting retained root tips, impacted teeth, and lesions. d. both b and c. 10. Factors that can affect the quality of dental radiographs include: a. film sensor placement. b. exposure. c. processing. d. all of the above. 11. The number of x-ray views that makes a patient's full-mouth series depends on: a. the dentist s preference. b. the number of teeth present in a patient s mouth. c. whether the paralleling or the bisecting technique is used. d. all of the above. 12. The American Academy of Oral and Maxillofacial Radiology recommends using the paralleling technique because: a. it is an easier technique to use. b. it provides the most accurate image with the least among of radiation exposure. c. the film sensor is placed closer to the teeth therefore reducing the chance of patient gagging. d. Both b and c are correct. 13. If the central ray of the x-ray beam is not centered on the film sensor, a partial image will result on the film sensor, which is called a(n): a. cone cut. b. herringbone image. c. blurred image. d. elongated image. 14. What is the usual number of posterior film sensor images taken in the parallel technique? a. 2 b. 4 c. 6 d. 8 10

11 15. An anterior set of images includes: a. premolars and molars. b. canines and incisors. c. canines and premolars. d. incisors and molars. 16. To correct an elongated image on an x-ray view, the vertical angulation needs to be: a. increased. b. decreased. c. lowered. d. flattened. 17. When taking periapical x-rays, the patient s head is for maxillary films and for the mandibular arch. a. tilted back slightly; tilted back slightly b. tilted back slightly; upright c. upright; tilted back slightly d. upright; upright 18. When taking a premolar bitewing image, the anterior edge of the film sensor should be placed: a. in the middle of the first premolar. b. on the distal half of the canine. c. on the distal half of the lateral incisor. d. on the mesial of the second premolar. 19. When taking radiographs using film, the white side of the film is always placed: a. away from the teeth. b. toward the teeth. c. either away from or toward the teeth, it does not matter. d. right next to the teeth being radiographed. 20. When mounting radiographs, it is important to: a. know the anatomy of the maxilla and mandible. b. mount the films in the order of the teeth. c. label the mount with the patient's name and date before mounting the films. d. do all of the above. Chapter A panoramic image allows the dentist to: a. detect caries. b. view the entire dentition and related structures in one film. c. view all of the sinus cavities. d. do both a and b. 2. Each panoramic unit has a(n) that is used to align the patient s teeth as accurately as possible. a. head position b. tubehead c. exposure control d. power source 11

12 3. The exposure controls allow the to be adjusted on the panoramic x-ray unit, to accommodate patients of different sizes. a. exposure time b. vertical angulation c. horizontal angulation d. milliamperage and kilovoltage 4. A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise, a will appear on the image. a. dark area b. blurred area c. ghost image d. blurred area and a ghost image 5. A ghost image will appear than normal and on the side of the image. a. larger; opposite b. larger; same c. smaller; opposite d. smaller; same 6. To avoid a lead apron artifact on a panoramic radiograph: a. use a lead apron without a thyroid collar. b. place the lead apron high around the neck of the patient so that it does not block the x-ray beam. c. place the lead apron low around the neck of the patient so that it does not block the x-ray beam. d. do both a and c. 7. Anterior teeth that appear fat are caused by the: a. patient s teeth positioned too far forward on bite block. b. patient s teeth positioned too far back on bite block. c. patient not sitting or standing up straight. d. chin positioned too low. 8. Advantages of panoramic imaging, when contrasted with intraoral imaging, include: a. less radiation exposure. b. no focal trough limitations. c. lower equipment cost. d. both a and c. 9. The main components of the panoramic unit include exposure controls and the: a. x-ray tubehead. b. x-ray tubehead, position-indicator device. c. x-ray tubehead, head positioner. d. position-indicator device, head positioner. 12

13 10. A radiopaque, cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the: a. patient s chin was too high during the procedure. b. patient s lead apron was incorrectly placed or a lead apron with a thyroid collar was used. c. patient s head was posterior to the focal trough. d. patient moved during the procedure. 11. A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient s: a. chin was too low. b. head was posterior to the focal trough. c. lips were not closed on the bite-block during the exposure. d. tongue was not in contact with the palate during the exposure. 12. When a dark radiolucent shadow obscures the apices of the maxillary teeth, the: a. patient s lips were not closed on the bite-block during the exposure. b. patient s tongue was not in contact with the palate during the exposure. c. patient s head was posterior to the focal trough. d. patient needed to swallow. 13. When a patient s chin is too high during the panoramic exposure: a. the maxillary premolars will be blurred. b. the floor of the nasal cavity will be superimposed over the roots of the mandibular teeth. c. a reverse smile line will appear on the radiograph. d. detail of the mandibular region will be lost. 14. When a patient s teeth are not positioned in the groove of the bite-block, the teeth will appear: a. fat. b. skinny. c. tall. d. short. 15. When a patient does not stand or sit with a straight spine: a. the panoramic image will be blurred. b. an exaggerated smile line or curved downward smile line will appear. c. detail of the apical regions of the teeth will be lost. d. the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information. 13

Extraoral Imaging. Chapter 42. Copyright 2018, Elsevier Inc. All Rights Reserved. 1

Extraoral Imaging. Chapter 42. Copyright 2018, Elsevier Inc. All Rights Reserved. 1 Extraoral Imaging Chapter 42 Copyright 2018, Elsevier Inc. All Rights Reserved. 1 Learning Objectives Lesson 42.1: Panoramic Imaging 1. Pronounce, define, and spell the key terms. 2. Discuss panoramic