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Dental Radiology Chapter 17 Review Questions
Terms in this set (24)
Size 1 receptor
Size 2 receptor
Rinn XCP aiming ring, posterior
Rinn XCP aiming ring, anterior
Rinn XCP indicator arm, posterior
Rinn XCP indicator arm, anterior
Rinn XCP bite-block, posterior
Rinn XCP bite-block, anterior
Magnification and Distortion
What happens to the image when the object-receptor distance is increased?
Beam alignment device
What piece of equipment is required to hold the receptor parallel to the long axis of the tooth in the paralleling technique?
Extension cone paralleling
What do the letters X, C, and P refer to?
What size receptor is used with the posterior XCP instrument?
What beam alignment devices are recommended for use with the paralleling technique to reduce radiation exposure?
Maxillary arch parallel to the floor; and midsagital line perpendicular to the floor
How is a patients head positioned before exposing receptors?
To avoid image magnification
Why is an increased target-receptor distance required in the paralleling technique?
90 degrees to the receptor and long axis of the tooth
What describes the central ray to the receptor in the paralleling technique?
The receptor and the tooth are parallel to each other
What describes the relationship between the receptor and the long axis of the tooth in the paralleling technique?
The receptor is placed away from the tooth and toward the middle of the oral cavity
What describes the distance between the receptor and the tooth in the paralleling technique?
how are anterior receptors placed?
How are posterior receptors placed?
Posterior receptors should always be exposed ___________ anterior receptrs
lack of parallelism
If this occurs less than 20 degrees, the image is generally acceptable
Advantages of the paralleling technique
1. Increased accuracy
2. simplicity of use
3. ease of duplication
The ______________of the paralleling technique always outweigh the disadvantages
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