Radiography Midterm Review PDF

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Rad I midterm review...

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Chapter 19 Questions - BW Technique 1. What does the term bite-wing refer to? a. Patient “bites” on a “wing” (tab) to stabilize film. 2. What size receptor is recommended for use with the BW technique in the adult patient? a. Size 2 3. What size receptor is recommended for use with the BW technique in the pediatric patient with primary dentition? a. Size 0 4. How is the patient’s head positioned before exposing a BW receptor? a. Maxillary arch parallel to the floor; midsagittal plane perpendicular to the floor 5. What is the primary use of BW images? a. To observe interproximal caries. 6. What size receptor is used to include all of the posterior teeth in one BW exposure? a. Size 3 7. What kind of angulation is determined by the up and down movement of the position-indicating-device (PID)? a. Vertical angulation. 8. What type of angulation is determined by the side-to-side movement of the PID? a. Horizontal angulation. 9. When the central ray of the x-ray is not directed through the contact areas of the teeth, what error is seen on the resulting image? a. Overlapped contacts 10. When does a cone-cut result? a. When the beam is not centered over the film, the x-ray doesn’t hit the film. 11. Which examination area describes the primary use of the BW image? a. Interproximal areas of the teeth. 12. Which is the correct vertical angulation used with the BW technique and the bite tab? a. +10 degrees 13. Which statement describes the relationship of the receptor to maxillary and mandibular teeth in the BW technique? a. The receptor and the teeth are parallel to each other. 14. Receptor placement: a. Anterior BWs may be placed vertically b. Posterior BWs may be placed horizontally c. Posterior BWs may be placed vertically 15. Exposure sequence for a CMS that includes periapical and BW exposures: a. Anterior periapical receptors are always exposed 1st b. Posterior periapical receptors are exposed anterior periapicals c. BW receptors are exposed last 16. Basic principles of the BW technique: a. Method used to examine the interproximal surfaces of the teeth b. The receptor is placed in the mouth parallel to the crowns of both maxillary and mandibular teeth

c. The receptor is stabilized when the patient bites on the BW tab of the biteblock of the beam alignment device d. When using a BW tab, the central ray of the x-ray beam is directed through the contacts of the teeth, using a vertical angulation of +10 degrees 17. Describe the 2 ways to stabilize the receptor in the BW technique: a. When the patient bites on the BW tab b. When the patient bites on the beam alignment device 18. State the basic rules for the BW technique: a. Receptor placement. The BW receptor has to be positioned to cover the area of the teeth being examined. b. Receptor position. The BW receptor has to be positioned parallel to the crowns of the maxillary and mandibular teeth. The receptor must be stabilized when the patient bites on the BW tab or the beam alignment device. c. Vertical angulation. When a BW tab is used, the central ray of the xray beam must be directed at +10 degrees. d. Horizontal angulation. When a BW tab is used, the central ray of the xray beam must be directed through the contact areas between the teeth. e. Receptor exposure. The xray beam must be centred on the receptor to ensure that all areas of the receptor are exposed. Not doing this results in a partial image or a cone-cut. 19. Discuss patient and equipment preparations necessary before using the BW technique: a. Patient: i. Explain imaging procedures to client ii. Adjust chair so that patient is positioned upright and the level of the chair is at a comfy working height iii. Adjust the headrest to support and position the patient’s head. Position the patient’s head such that the maxillary arch is parallel to the floor and the midsagittal plane is perpendicular to the floor iv. Place and secure the lead apron with the thyroid collar on the patient v. Request that the client removes eyeglasses and all objects from the moth (ie. gum, dentures, retainers) that may interfere with the procedure b. Equipment: i. Set the exposure control factors (kilovoltage, milliamperage, time) on the xray unit according to the manufacturer's recommendations ii. If a beam alignment device is used with the BW technique, open the sterilized package containing the device, and assemble the device on a covered work area iii. If the BW tab is used, attach the tab to the white side of the film/correct side of the receptor 20. Exposure sequence for a CMS that includes both periapical and BW procedures: a. The recommended exposure sequence for a complete mouth radiographic series is as follows: anterior periapical films, followed by posterior periapical films, and finished with BW exposures. 21. Describe premolar and molar BW placements: a. Premolar

i. Front edge in middle of lower mandibular canine ii. Premolars visible iii. Occlusal plane in middle of receptor iv. Occlusal plane parallel with bottom edge of receptor v. Correct HA = open premolar contacts vi. Correct VA of +10 degrees vii. No cone cuts b. Molar i. Front edge in middle of lower mandibular 2nd premolar ii. Molars visible iii. Occlusal plane in middle of receptor iv. Occlusal plane parallel with bottom edge of receptor v. Correct HA = open molar contacts vi. Correct VA of +10 degrees vii. No cone cuts 22. Explain the modifications in the BW technique that are used for patients with edentulous spaces or bony growths; a. Edentulous i. Use cotton rolls where teeth are missing ii. Cotton rolls prevent tipping of the receptor b. Tori (bony growths) i. BW must be placed between tori and the tongue ii. Rinn beam alignment device is recommended 23. Why is a +10 VA used with BW technique and bite tab? a. It compensates for the slight bend of the upper portion of the upper portion of the receptor and the slight tilt of the maxillary teeth 24. Order of exposure: a. Periapicals, max interior b. Periapicals, man anterior c. Periapicals, posterior d. BW, premolar e. BW, molar...