1 / 30

Mandible & TMJ Lecture

Mandible & TMJ Lecture. RT 233 Week 7. Hello class, This is my preliminary lecture, I may add more slides over the weekend. Please check back on Sunday evening for any revisions. Mandible. Mandible. Only movable bone in the skull Densest & largest facial bone 2 bones at birth

Download Presentation

Mandible & TMJ Lecture

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Mandible & TMJ Lecture RT 233 Week 7

  2. Hello class, • This is my preliminary lecture, I may add more slides over the weekend. Please check back on Sunday evening for any revisions.

  3. Mandible

  4. Mandible • Only movable bone in the skull • Densest & largest facial bone • 2 bones at birth • Contains mental foramina

  5. Temporomandibular Joint

  6. PA Mandible (rami) • Seated or Prone • Forehead and nose on IR • OML & MSP perpendicular to IR • CR perpendicular to exit acanthion

  7. PA Mandible (rami) Radiograph • Mandibular rami and lateral portion of body are visualized • Entire mandible without rotation or tilt

  8. PA Mandible Rami- Diagram

  9. PA Mandible (body) • Seated or Prone • Nose and chin on grid device or table placing mandibular symphysis parallel with plane of IR • AML & MSP perpendicular to IR • CR perpendicular to level of lips

  10. PA Mandible (body) Radiograph • Contrast and density are sufficient to view body and rami • Sharp bony detail indicating no motion

  11. PA Axial (rami)Mandible Positioning • Seated or Prone • Forehead and nose on IR • OML & MSP perpendicular to IR • CR 20- 25 cephalic, centered to exit acanthion

  12. PA Axial (rami)Mandible Radiographs • TMJ and heads of condyles are visible through mastoid processes. • Condyloid processes are well visualized, slightly elongated. • Entire mandible with no rotation or tilt with adequate density

  13. PA Axial (body)Mandible Positioning • Seated or Prone • Nose and chin on grid device or table placing mandibular symphysis parallel with plane of IR • AML & MSP perpendicular to IR • CR between TMJ’s, 30 cephalad.

  14. PA Axial (body)Mandible Radiographs • TMJ’s just inferior to mastoid process • Symmetric rami • Adequate contrast and density

  15. AP Axial – Towne Method • OML & MSP perpendicular to IR • CR 35-40 caudad • Centered to glabella midway between EAMS and angles of mandible • If IOML is used increase CR angle 7 degrees

  16. AP Axial- Towne Method Radiograph • Demonstrates condyloid processes symmetrically • Clear visualization of TMJ fossae and condyle relationship • Minimal SI of TM fossae and mastoid portions

  17. Axiolateral Oblique Positioning for Ramus • Seated, semiprone or semisupine • IPL perpendicular to IR • Mouth closed- teeth together • Extend neck, chin jutted forward • CR 25 degrees cephalic to pass through area of interest

  18. Axiolateral Oblique Radiograph for Ramus • No overlap of ramus by opposite side of mandible • No elongation or foreshortening of ramus • No superimposition of ramus by c-spine

  19. Axiolateral Oblique Positioning for Body • Seated, semiprone or semisupine • IPL perpendicular to IR • Mouth closed- teeth together • Extend neck, chin jutted forward • Rotate pt’s head 30 degrees toward IR • CR 25 degrees cephalic to pass through area of interest

  20. Axiolateral Oblique Radiograph for Body • No overlap of body by opposite side of mandible • No elongation or foreshortening of body • No superimposition of body by c-spine

  21. Axiolateral Oblique Positioning for Mandibular Symphysis • Seated, semiprone or semisupine • IPL perpendicular to IR • Mouth closed- teeth together • Extend neck, chin jutted forward • Rotate pt’s head 45 degrees toward IR • CR 25 degrees cephalic to pass through area of interest

  22. Axiolateral Oblique Radiograph for Mandibular symphysis • No overlap of mentum by the opposite side of mandible • No foreshortening of the mentum region

  23. Panorex Mandible • Explain how tube/image receptor move • IOML perpendicular • Stand straight, not jutting chin forward • Instruct pt to keep lips together and tongue on roof of mouth

  24. Panorex Mandible Radiographs • Demonstrates teeth, mandible, TMJ’s • Density are uniform across image • No artifacts

  25. AP Axial Temporomandibular • Supine or seated upright • Posterior teeth closed and in contact • For open mouth- wide as possible without chin jutted forward • OML perp to IR • CR 35 caudad, centered midway between TMJ’s. • Enters approx 3” above nasion

  26. AP Axial TMJ Radiograph • No rotation • Minimal superimposition of petrosa on condyle in closed mouth • Condyle and TMJ below pars petrosa in open mouth

  27. Axiolateral TMJ • Semiprone or seated • Center ½” anterior to EAM • Rest cheek on grid device • Rotate MSP approx 15 degrees toward IR • IPL perpendicular • CR 15 caudad exiting through TMJ closest to IR about 1 ½ “ superior to upside EAM

  28. Axiolateral TMJ Radiograph • TMJ • Condyle lying in mandibular fossa in closed mouth • Condyle lying inferior to articular tubercle in open mouth

  29. Axiolateral Open mouth

  30. Axiolateral Closed mouth

More Related