OPG Positioning errors

Question 1

How will an OPG that is too far in appear?

Answer 1

• long and thin
• image looks squashed
• premolars overlap
• vertebrae overlap with the mandibular rami

Question 2

How does an OPG that is too far out appear?

Answer 2

• short and stout
• image looks stretched and wide
• condyles may be off sides

Question 3

How does an OPG appear then the patients chin is up?

Answer 3

• image looks uphappy
• hard palate obscures the maxillary incisor roots
• condyles may be off sides on the film
• upper incisor roots are blurred

Question 4

How does an OPG appear when the patients chin is down?

Answer 4

• image is smiling
• hyoid bone may be superimposed on the mandible
• lower incisor roots are blurred

Question 5

An object that is not in the focal trough will appear…

Answer 5

blurred

Question 6

An object that is outside of the focal trough will appear…

Answer 6

small

Question 7

An object that is insice of the focal trough will appear …

Answer 7

enlarged