Author Question: Which projection will demonstrate anterior posterior displacement within the bony orbit? lateral ... (Read 102 times)

rachel9 · **on:** Jul 17, 2018

Which projection will demonstrate anterior posterior displacement within the bony orbit?

lateral
Water's method
PA axial Caldwell
PA

Question 2

A properly positioned modified Water's is determined by which of the following criteria?

the petrous pyramids fill the lower one-third of the orbits
the petrous pyramids fill the maxillary sinuses
the petrous pyramids half fill the maxillary sinuses
the petrous pyramids lie inferior to the maxillary sinuses

iceage · **Reply #1 on:** Jul 17, 2018

Answer to Question 1

lateral

Rationale: The lateral projections will always prove anterior to posterior displacement of bony anatomy.

Answer to Question 2

the petrous pyramids half fill the maxillary sinuses

Rationale: The modified Water's aligns the LML perpendicular to the IR. Since the chin is not positioned as high, the petrous pyramids will fill half the maxillary sinuses instead of falling below the maxillary sinuses.