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7 Cards in this Set
- Front
- Back
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Axiolateral projection: schuller method
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head in lateral position, IPL perp to IR, MSP parallel to bucky, IOML perp to front edge of IR. Angle 25-30 degrees caudad, centered to 1/2 inch anterior and 2 inches superior to upside EAMs. TMJ nearest IR is visible. Closed mouth demos condyle within mandibular fossa, open mouth: condyle moves to the anterior margin of fossa
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Axiolateral oblique projection: TMJs
Modified Law method |
prevent tilt by maintaining IPL perp to IR, MSP is parallel to IR to start. Align IOML perp to front edge of IR. From lateral position, rotate face toward IR 15 degrees. Angle CR 15 degrees caudad, centered to 1 1/2 inches superior to upside EAM to pass through downside TMJ. Tmj nearest IR is visible. closed mouth: condyle is within mandibular fossa. Open mouth: condyle moves to anterior margin of fossa
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AP Axial TMJs
modified Towne method |
tuck chin, bring OML perp to bucky or IOML perp and increase CR angle by 7 degrees. Align MSP perp to bucky. Angle CR 35 degrees caudad from OML or 42 from IOML. Direcr CR to pass through 1 inch anterior to level of TMJs (2 inches anterior to EAMs). An additional 5 degree increase may better demo the TM fossae and joint.
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axiolateral oblique: Mandible
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head in lateral position, side of interest against IR. Have pt close mouth and bring teeth together. extend neck slightly to prevent s/i of gonion over c-spine. rotate head toward IR to place mandibular area of interest parallel to IR. degree of oblique depends on which area of mandible is of interest. head in true lateral best demos: ramus, 30 degree rotation demos: body, 45 degree rotation demos: mentum. 10-15 rotation provides: general survey.
see textbook page 429 |
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PA or PA axial: mandible
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forehead and nose against bucky. tuck chin bringing OML perp to IR. MSP perp to bucky. center IR to junction of lips. PA: CR perp to IR, centered to exit at junction of lips (trauma: do supine). PA AXIAL: 20-25 cephalad centered to exit acanthion.
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SMV: Zygomatic arches
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hyperextend neck til IOML is parallel to IR. rest head on vertex of skull. MSP perp to bucky. CR perp to IR. center midway between zygomatic arches, 1.5 inches inferior to mandibular symphysis. If pt cannot hyperextend neck, angle CR perp to IOML. Corresct IOML/CR relationship, s/i of mandibular symphysis on frontal bone.
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AP AXIAL: Zygomatic Arches
modified Towne |
tuck chin, bring OML or IOML perp to IR. Align MSP perp to bucky. Angle CR 30 caudad to OML or 37 to IOML. center 1 inch above glabella (to pass through midarches) at the level of the gonion.
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