How Is the CR Aligned for the Acanthiomeatal (Reverse Waters)

question 23

Multiple Choice

How is the CR aligned for the acanthiomeatal (reverse Waters) projection for the facial bones?

• A)Perpendicular to the plane of the IR
• B)Parallel to the mentomeatal line
• C)Parallel to the lips-meatal line
• D)15° cephalad angle to the orbitomeatal line

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Definitions:

Hole Basis Fit System

A system for fitting where the size of the hole is kept constant and the size of the shaft is varied to obtain different types of fits.

Basic Size

The theoretical or nominal size from which limits of size are determined in machining or manufacturing a piece, serving as a reference for tolerances.

Loose Running Fit

A type of mechanical fit where components can move or rotate freely within each other, used for applications requiring minimal resistance.

Basic Diameter

The theoretical exact diameter of a cylindrical or conical feature as defined in a technical drawing, without any tolerances.