Mandible: Routine Radiographic Procedures
Body and dental arch:
Inferosuperior (intraoral) Projection
• Place the arms in a comfortable position and adjust the shoulders to lie in the same transverse plane.
• Fully extend the neck, rest the head on the vertex, and adjust it so that the midsagittal plane is vertical.
• Central ray is directed perpendicular to the plane of the film packet and center it to the intersection of the midsagittal plane and a coronal plane passing through the second molars.
• Structure shown; floor of the mouth,lower dental arch and portion of the mandibular body which it supports is demonstrated.
• Evaluation criteria; all of the lower teeth should be demonstrated so that the mandibular body will be almost entirely included. Distance between the teeth and the outer border of the mandible symmetrically in both sides.
AP Axial (intraoral) Position
• Patient is placed in supine position.
• Rest the patient’s head on the occiput, with the midsagittal plane is vertical adjust the flexion of the neck so that the occlusal plane is vertical. Immobilize the head. Central ray is directed to the tip of the chin at an angle of 55 degrees cephalad.
• Patient is in erect position. Central ray is directed horizontally to the tip of the chin.
• Structure shown; an oblique position of the region of the mandibular symphysis, showing the alveolar process, the incisors, and the canine teeth, is shown.
• Evaluation criteria; mandibular symphysis should be demonstrated without self superimposition. Mandible should not be rotated.