To determine the vertical angulation when using the bisecting technique, the central rays of the x-ray beam should be directed:
a. perpendicular to the image receptor.
b. parallel to the image receptor.
c. perpendicular to the imaginary bisector.
d. parallel to the imaginary bisector.
c. To cast an accurate shadow representation of a tooth onto the image receptor, the angle formed by the long axis of the tooth and the plane of the image receptor must be bisected. The central ray of the x-ray beam is directed perpendicular to this imaginary bisector.
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Small round painful ulcers were noted in the tongue of a 24-year-old man. This has been a recurrent problem. The duration of each episode is about 2 weeks. The lesions are not preceded by blisters. He probably has:
a. Pemphigus vulgaris b. Lupus erythematosus c. Recurrent herpes simplex d. Erosive lichen planus e. Aphthous ulcers
Aerial fuels are at least ____ above the ground.
a. 6ft b. 10ft c. 8ft d. 4ft