In the modified Waters method for facial bones, which line forms the 55-degree angle with the IR?

In the modified Waters method for facial bones, which line forms the 55-degree angle with the IR?

• A. Frankfort horizontal plane
• B. Infraorbitomeatal line (IOML)
• C. Interpupillary line
• D. Orbitomeatal line (OML)

Answer: (D)

In this modified Waters view, the reference line used to set the head’s orientation is the orbitomeatal line. The head is positioned so that the orbitomeatal line forms a 55-degree angle with the plane of the image receptor. This specific tilt helps separate the facial bones clearly by reducing overlap from the surrounding structures and positions the orbital rims and sinuses optimally for a facial-bones projection. The other lines (such as Frankfort horizontal, infraorbitomeatal, or interpupillary) define different reference relationships or views, but they are not what defines the 55-degree angle in this modified technique.

In this modified Waters view, the reference line used to set the head’s orientation is the orbitomeatal line. The head is positioned so that the orbitomeatal line forms a 55-degree angle with the plane of the image receptor. This specific tilt helps separate the facial bones clearly by reducing overlap from the surrounding structures and positions the orbital rims and sinuses optimally for a facial-bones projection. The other lines (such as Frankfort horizontal, infraorbitomeatal, or interpupillary) define different reference relationships or views, but they are not what defines the 55-degree angle in this modified technique.