Through a point on the ala-tragus line below the outer canthus of the eye toward the center of the image receptor describes the recommended point of entry of the central ray of the x-ray beam for which of the following occlusal radiographs?
A) Maxillary anterior topographical
B) Maxillary posterior topographical
C) Mandibular anterior topographical
D) Mandibular posterior topographical
B
Explanation: A) The point of entry for directing the central ray of the x-ray beam when exposing a maxillary posterior topographical occlusal radiograph is through a point on the ala-tragus line below the outer cantus of the eye toward the center of the image receptor.
B) The point of entry for directing the central ray of the x-ray beam when exposing a maxillary posterior topographical occlusal radiograph is through a point on the ala-tragus line below the outer cantus of the eye toward the center of the image receptor.
C) The point of entry for directing the central ray of the x-ray beam when exposing a maxillary posterior topographical occlusal radiograph is through a point on the ala-tragus line below the outer cantus of the eye toward the center of the image receptor.
D) The point of entry for directing the central ray of the x-ray beam when exposing a maxillary posterior topographical occlusal radiograph is through a point on the ala-tragus line below the outer cantus of the eye toward the center of the image receptor.
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