mandible, tmj Flashcards
- patient’s forehead and nose on the IR holder.
• OML and MSP must be perpendicular to IR
• CR 20 or 25 cephalad to exits at the Acanthion. - shows the Mandibular body and Rami. This radiographic approach is used to demonstrate medial or lateral displacement of fragments in fractures of the rami.
PA Axial
• CR: Directed 25 degrees cephalad to pass directly through the mandibular region of interest.
Axiolateral Oblique Projection
to demonstrate Ramus
patient head in true lateral position
to demonstrate Body
rotate head 30 degrees towards IR
to demonstrate Symphysis
rotate head 45 degrees towards IR
• OML is perpendicular to the plane of the IR.
• CR: Directed 35 degrees caudad, entering at a point approximately 3 inches above the nasion.
• S/S: the condyles of the mandible and the mandibular fossae of the temporal bones.
AP Axial
- From lateral position, rotate the face 15° towards the IR
- CR - Angle CR 15° caudad, centered to 1.5 inches superior to upside EAM (to pass through downside TMJ).
Axiolateral Oblique Projection /
Modified Law Method
CR - Angle CR 25° to 30° caudad, centered to 1/2 inch anterior and 2 inches superior to upside EAM.
Axiolateral Projection / Schuller Method
• This technique of body-section radiography provides a panoramic image of the entire mandible, including the TMJ, and of both dental arches on one long, narrow film curved to conform to the shape of the patient’s jaw.
- xray tube and the IR rotate in the same
direction around the seated and immobilized patient.
• The rotation time varies from 10 to 20
seconds.
Panoramic Tomography/ Pantomography/ and Rotational Tomography/ Ortho-Pantomography
CR PA Axial (mandible)
20-25 cephalad
perpendicular sa PA Axial (mandible)
OML and MSP
RP of PA Axial (mandible)
Acanthion
SS of PA Axial (Mandible)
mandibular body and rami
CR Axiolateral Oblique Projection (mandible)
25 cephalad
CR AP Axial Projection (tmj)
35 degrees caudad
RP AP Axial (tmj)
approx. 3 inches above nasion
SS AP Axial (tmj)
condyles of the mandible and the mandibular fossae of the temporal bones.
rotation modified law
15 towards IR
CR modified law
15 caudad
RP modified law
1.5 inch superior to upside EAM
CR Schuller method
25-30 caudad
RP schuller method
centered to 1/2 inch anterior and 2 inches superior to upside EAM
rotation time of panoramic xray
10-20 s
other terms for panoramic tomography
Pantomography/ and Rotational Tomography/ Ortho-Pantomography
