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Radiography
Ch 20 Bisecting Technique
| Question | Answer |
|---|---|
| The rule of isometry states that two triangles are equal if they have ______ equal angle(s) and share a common side. | Two |
| Where must the receptor be placed when the bisecting technique is used? | Along the lingual surface of the tooth |
| When the bisecting technique is used, which angle is bisected? | The angle formed by the receptor and the long axis of the tooth |
| When the bisecting technique is used, the central ray is directed at 90 degrees to the | Imaginary bisector. |
| What should not be used to stabilie the receptor while using the bisecting technique? | The patient's finger |
| What is used to stabilize the receptor and to align the position-indicating device (PID) while using the bisecting technique? | A beam alignment device |
| What is the biggest benefit of using a rectangular collimator on a Rinn BAI instrument? | Reduces the patient’s exposure to radiation. |
| What vertical angulation should you set the PID at for tooth #13 to get a dental image that is the same length as the tooth while using a Snap-A-Ray? | +30 to +40 degrees |
| When Rinn BAI instruments are used, “BAI” refers to which of the following? | Bisecting angle instrument |
| Which of the commercially available receptor holders are recommended for use with both the paralleling and the bisecting techniques? | Rinn BAI instruments, Stabe bite-block, and Snap-A-Ray receptor holder |
| Which commercially available receptor holder is recommended for one-time use only? | Stabe bite-block |
| Which size receptor is traditionally used with the bisecting technique? | #2 receptor for anterior teeth and for posterior teeth |
| Which techniques use the same principles of horizontal angulation? | Paralleling, bisecting, and bite-wing |
| With the bite-wing technique, the vertical angulation is predetermined; the central ray is directed at ____ degrees to the occlusal plane. | +10 |
| The vertical angulation is determined by the imaginary bisector; the central ray is directed perpendicular to the imaginary bisector during which technique? | Bisecting |
| Foreshortened images refer to images of the teeth that appear _________. | Shortened |
| Foreshortening of images results from ___________ vertical angulation. | Excessive |
| When the bisecting technique is used, foreshortening will occur if the central ray is directed perpendicular to the | Plane of the receptor. |
| Elongated images refer to images of the teeth that appear too __________. | Long |
| Elongation of images results from _____________ vertical angulation. | Insufficient |
| The receptor should be placed approximately ____ inch beyond the incisal or occlusal surfaces when using the bisecting technique. | 1/8 |
| According to the text, when exposing the anterior teeth using the bisecting technique, there are ________ recommended size 2 periapical receptor placements. | Six |
| The recommended anterior periapical exposure sequence for the bisecting technique starts with the | Maxillary right canine. |
| The recommended posterior periapical exposure sequence for the bisecting technique is to begin with the | Maxillary right quadrant. |
| According to the recommended posterior periapical exposure sequence for the bisecting technique, the second posterior quadrant exposed should be the | Mandibular right quadrant. |
| According to the text, when exposing a complete mouth series (CMS) using the bisecting technique, there are ____ recommended size 2 periapical receptor placements. | 14 |
| According to the text, the disadvantages of which technique are greater than the advantages. | Bisecting |
| Which would be the preferred technique for taking periapical images? | Paralleling |
| The primary disadvantage of the bisecting technique when contrasted with the paralleling technique is | Dimensional distortion. |
| When adjusting the horizontal angulation, the PID is moved ___________. | Side-to-side |
| When adjusting the vertical angulation, the PID is moved ______________. | Up-and-down |
| For the maxillary premolar exposure, the mesial edge of the receptor should be aligned with the midline of the maxillary | Canine |
| For the mandibular molar exposure, the mesial edge of the receptor should be aligned with the midline of the | Second premolar |
| With the bisecting technique, the recommended vertical angulation range for tooth number 6 is _________ degrees. | +45 to +55 |
| With the bisecting technique, the recommended vertical angulation range for tooth number 30 is _________ degrees. | -5 to 0 |
| The contacts on your dental image are overlapped, which of the following would you correct when retaking the image? | Horizontal angulation |
| The teeth on your dental images appear shorter than your patient’s teeth, which of the following would you correct when retaking the dental image? | Decrease vertical angulation |
| What would you do to correct errors on a premolar image that is missing the canine and first premolar, and the distal edge of the radiopaque area is curved? | Receptor exposure |
| You are using the Rinn Snap-A-Ray to take a dental image of tooth number 13. What vertical angulation should you set the PID at to get the proper image? | +30 to +40 degrees |
| You are using the Rinn Stabe Bite-block to take a dental image of teeth numbers 23 to 26. What vertical angulation should you set the PID at to get the proper image? | –15 to –25 degrees |
| You are using the Rinn BAI System to take a dental image of tooth number 1. What vertical angulation should you set the PID at to get the proper image? | There is no need to set the vertical angulation. |
Created by:
BrendaAlberts