Radiographic TechniqueQuestion 51 of 100
What is the purpose of the raised identification dot on intraoral film, and how should it be oriented during placement?
a.It marks the lead foil side and must face away from the beam
b.It allows the operator to determine the patient's left and right during mounting, and the convex side faces the beam, toward the occlusal or incisal edge
c.It indicates the expiration date and should face the tongue
d.It has no clinical function and may be oriented in any direction
Explanation
The identification dot establishes orientation so the mounted series can be correctly assigned to the patient's right and left; the raised convex side faces the beam and is positioned toward the occlusal or incisal edge to avoid obscuring apical structures. It does not mark the lead foil, which is on the back of the packet facing away from the beam. The dot carries no date information, and orienting it randomly makes accurate mounting impossible.
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