The recommended vertical angulation for exposing a mandibular premolar periapical radiograph
using the bisecting technique is:
a. -10 degrees
b. -15 degrees
c. -20 degrees
d. -5 degrees
a. To obtain a radiograph with an accurate representation of the mandibular premolar, the central ray of the x-ray beam should be directed toward the imaginary bisector between the long axis of the canine and the plane of the image receptor in the vertical dimension at -10 degrees.
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