A parietoacanthial sinus projection (Waters method) with accurate positioning demonstrates
1)an equal distance from the lateral orbital margin to the lateral cranial cortex on both sides.
2)the bony nasal septum in alignment with the long axis of the exposure field.
3)the petrous ridges demonstrated inferior to the maxillary sinuses.
4)the ethmoid sinus through the mouth cavity in an open-mouth position.
A) 1 and 2 only
B) 3 and 4 only
C) 1, 2, and 3 only
D) 1, 2, 3, and 4

Question

Quizplus · Accepted Answer

The parietoacanthial sinus projection (Waters method) is designed to visualize the facial bones, particularly the orbits, maxillary sinuses, and nasal septum. Correct positioning results in equal distance from the lateral orbital margin to the lateral cranial cortex on both sides (1), the bony nasal septum aligned with the long axis of the exposure field (2), and the petrous ridges positioned below the maxillary sinuses (3). The ethmoid sinuses are not visualized through the mouth cavity in an open-mouth position in this projection; that description does not apply to the Waters method.

A Parietoacanthial Sinus Projection (Waters Method) with Accurate Positioning Demonstrates