Each of the following statements regarding horizontal angulation is correct EXCEPT one. Which one is the EXCEPTION?
a. Contact points should appear open or separate from each other on the radiograph.
b. The central ray should be directed parallel to the curvature of the arch.
c. Overlapped contact points result when incorrect horizontal angulation is used.
d. Horizontal angulation is the positioning of the central ray in a side-to-side plane.
b. The central ray should be directed perpendicular to the curvature of the arch, through the contact points of the teeth.
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