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33 Cards in this Set

  • Front
  • Back
To demonstrate the mandibular rami with the PA projection, which two facial structures should be touching the grid?
Forehead and nose
Which positioning line should be perpendicular to the plane of the IR?
OML
How should the MSP be positioned with reference to the IR for a PA projection.
Perpendicular
What breathing instructions should be given to the patient?
Stop breathing for the exposure.
Through which positioning landmark of the face should the CR exit?
Acanthion
How does the vertebral column affect the image?
It superimposes the central part of the mandibular body.
True of false.
The central ray should be directed perp to the midpoint of the IR.
true
What two evaluation criteria that indicate the patient was properly positioned for the PA projection for the mandibular rami.
The entire mandible should be included.
The mandibular body and rami should be symmetric on both sides.
PA axial mandible
Which two facial structures should be touching the vertical grid device?
Forehead and nose
PA axial mandible.
Which body plane should be perp to the plane of the IR?
MSP and AML
PA axial mandible
Which positioning landmark should be centered to the IR?
Acanthion
PA axial mandible
Which positioning landmark should be centered to the IR?
Acanthion
PA axial mandible
How should the CR be directed?
20-25 cephalad
PA axial mandible
What prevents the central part of the mandibular body from being clearly demonstrated.
Superimposition of the spine.
PA axial mandible
What evaluation criteria indicate the patient was properly positioned for a PA axial projection?
The entire mandible should be demonstrated.
The condylar processes should be clearly demonstrated.
The mandibular body and rami should be symmetric on both sides.
PA axial mandible
How should the CR be directed?
20-25 cephalad
AP axial TMJ's
In the closed mouth projection should the upper and lower teeth be in contact?
Yes
PA axial mandible
How should the CR be directed?
20-25 cephalad
Why should the incisors not contact when the patient is positioned for the closed mouth AP axial projection for TMJ's?
Occlusion of the incisors places the mandible in a position of protrusion in which the condyles are carried out of the mandibular fossae.
When should the patient not be asked to open his mouth wide for an AP axial projection
Any trauma to the mandible where the mandible is suspected to be fractured; because of the danger of fracture displacement.
AP axial TMJ's
Which plane and positioning line of the head should be perp to the IR.
MSP and OML
AP axial TMJ's
How many degrees and in which direction should the CR be directed?
35 caudad
AP axial TMJ's
Where should the CR enter the patient?
3" above the nasion
AP axial TMJ's
To which landmark should the IR be centered?
Central ray
Name two evaluation criteria that indicate hte patient was properly positioned for an AP axial TMJ projection with the mouth closed.
The head should not be rotated.
ONly minimal superimposition by the petrosa on the condyle should be seen.
Name two evaluation criteria that indicate the patient was properly positioned for an AP axial projection with the mouth open.
The head should not be rotated.
The condyle and TM articulation should be demonstrated below the petrosa.
Axiolateral oblique for TMJ
Where on the patient should the IR be centered?
1/2 anterior to the EAM
Axiolateral oblique for TMJ
How should hte MSP be positioned with reference to the IR?
To form an angle of 15 degrees
Axiolateral oblique for TMJ
Which positioning line of the head should be parallel with the transverse axis of the IR?
AML
Axiolateral oblique for TMJ
How many degrees and in what direction should the CR be directed?
15 caudad
Axiolateral oblique for TMJ
How many degrees and in what direction should the CR be directed?
15 caudad
Axiolateral oblique for TMJ
Through what suture should the CR exit the patient?
The TMJ closer to the IR.
Axiolateral oblique for TMJ
Should the entire side of the mandible be from the condyle to the symphysis be demonstrated?
No. Close beam restriction should surround the affected TMJ.