Chapter 13

Question 2

What factors may make image receptor placement difficult?

Answer 2

Children, adults with small mouths, low palatal vaults, presence of tori, sensitive oral mucosa, exaggerated gag reflex, edentulous regions.

Question 3

Which of the following is not a disadvantage of the paralleling technique?

Answer 3

C) There is a limited number of image receptor holders that accommodate the paralleling technique.

Many choices of image receptor holders with external aiming devices are available.

Question 4

How should anterior periapical radiographs be positioned?

Answer 4

With the long dimension vertical.

Question 5

How should posterior periapical radiographs be positioned?

Answer 5

With the long dimension horizontal.

Question 6

Which teeth should be imaged on an adult molar periapical radiograph?

Answer 6

Distal half of first molar, second molar, and third molar.

Question 7

What is the ideal design of a paralleling image receptor holder?

Answer 7

A long bite block and an L-shaped backing.

Question 8

Can image receptor positioning devices be used for both paralleling and bisecting techniques?

Answer 8

C) Both parts of the statement are true.

Question 9

Where must the patient bite down on the biteblock for proper positioning?

Answer 9

As far away from the teeth as possible, except for the mandibular premolars and molars.