Paralleling

Question 1

Object-Receptor Distance

Answer 1

distance between tooth and receptor; must be increased to keep parallelism; can result in image magnification/distortion

Question 2

Target-Receptor Distance

Answer 2

distance between x-ray source and receptor; must be increased to ensure parallelism, compensates for magnification. Long cone PID must be used

Question 3

Paralleling Technique: Rules

Answer 3

receptor placement, receptor position, vertical angulation, horizontal angulation, receptor exposure

Question 4

Modifications

Answer 4

shallow palate or bony growths. ALWAYS examine oral cavity beforehand; use cotton rolls or increase vertical angulation to adjust

Question 5

Advantages

Answer 5

accuracy, simplicity, duplication

Question 6

Disadvantages

Answer 6

receptor placement difficult, discomfort

Question 7

Errors

Answer 7

receptor placement, missed apices, dropped receptor corner, for-shortening, elongation

Question 8

Size 1 Receptor

Answer 8

anterior, long portion in vertical direction

Question 9

Size 2 Receptor

Answer 9

posterior, long portion in horizontal direction

Question 10

Sequence

Answer 10

anterior - posterior; easier to tolerate and less chance of triggering gag reflex early on