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10 Cards in this Set

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  • Back
Describe the PA projection for the mandibular rami
OML perp
Shows body and rami
Used to demonstrate medial/lateral displacement of fragments.
Describe the PA axial projection for the mandibular rami
20-25 cephalad to the acanthion
Used to demonstrate the mandibular body, rami ad condyloid process, medial/lateral displacements of fragments of the rami.
The central part of the body is not well shown because of the superimposed spine.
Describe the position that demonstrates the condylar processes
AP position
Describe the axiolateral oblique projection for body, symphysis, and and ramus of the mandible.
SMV
Describe the positions for the AP axial projection for the TM joints.
35 caudad
CR midway between the TMJ's
3" above the nasion
Describe the axiolateral projection for the TMJ's. (Schuller)
Center 1/2 inch anterior to the EAM. Place the patient's head lateral. IP line perp to the IR.
Demonstrates condyle lying in mandibular fossa in the closed mouth exam.
Condyle lying inferior to articular tubercle in the open mouth exam if the patient is normal and able to open wide.
Describe the axiolateral projection for TMJ's (Law's)
Center 1/2" anterior to the EAM. Cheek on grid. MSP 15 degrees toward IR. IP perp. AML parallel with the transverse axis.
CR 15 caudad exiting TMJ closest to the IR. 1.5" superior to EAM
Explain the importance of doing an open and closed mouth for TMJ's.
SS p. 397
"The open and closed mouth positions demonstrate the condyles and necks of the mandible. The images also show the relation between the mandibular fossa and condyle. The open mouth position demonstrates the mandibular fossa and the inferior and anterior excursion of the condyle. Both sides are examined for comparison. The closed mouth position demonstrates fractures of the neck and condyle of the ramus.
Name the two basic projections for nasal bones.
Lateral, tangential
Describe the position for a lateral projection of the nose.
MSP parallel to tabletop. IP perp to tabletop. IOML parallel with the transverse axis of the IR. Support mandible to prevent rotation.