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Questions and Answers
What result does the bisecting technique have on the object–image receptor distance?
What result does the bisecting technique have on the object–image receptor distance?
- It remains constant regardless of mouth anatomy.
- It is shorter in the area of the crown than in the root. (correct)
- It creates a longer distance throughout.
- It only affects the distance in maxillary molar areas.
Which technique requires positioning the receptor away from the teeth to avoid impinging on supporting structures?
Which technique requires positioning the receptor away from the teeth to avoid impinging on supporting structures?
- Bisecting technique
- Paralleling technique (correct)
- Direct technique
- Radial technique
In which area is the least divergence of object–image receptor distance observed?
In which area is the least divergence of object–image receptor distance observed?
- Mandibular molar areas (correct)
- Maxillary anterior areas
- Mandibular anterior areas
- Maxillary posterior areas
What is a necessary adjustment when using the paralleling technique due to increased object–image receptor distance?
What is a necessary adjustment when using the paralleling technique due to increased object–image receptor distance?
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Which anatomical feature creates the greatest divergence in the bisecting technique?
Which anatomical feature creates the greatest divergence in the bisecting technique?
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Study Notes
Object–Image Receptor Distance and Technique
- The object–image receptor distance depends on the technique used to hold the receptor in position.
- When the bisecting technique is used, the receptor is pressed against the palatal or lingual tissues, resulting in a shorter object–image receptor distance in the crown area than the root area.
- The least divergence between the long axis of the tooth and the image receptor occurs in the mandibular molar areas.
- The greatest divergence occurs in the maxillary anterior areas due to the curvature of palatal structures.
- The paralleling technique requires positioning the receptor in the middle of the oral cavity, away from the teeth, to avoid impinging on the supporting bone and gingival structures.
- The paralleling technique results in object–image receptor distances that are often more than 1 in.(25 mm).
- The paralleling technique compensates for the increased object–image receptor distance by recommending an increase in the target–image receptor distance (use a longer PID) to help offset the distortion.
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