Mandible and maxilla oblique radiography

radiographic techniques of mandible oblique

1. Mandible & maxilla oblique radiography DINESH DARSHANA RADIOLOGIC TECHNOLOGIST – SRI LANKA

2. Mandible oblique Anatomy

3. According to the anatomy of mandible there are main 3 areas, Symphysis menti area Mandible body area Ramus area

4. How to demonstrate mandible in a radiograph? It is too hard to clearly demonstrate above 3 areas in one projection. So there are 3 separate projections to demonstrate interested anatomy. Interested area should be parallel to IR.

5. Patient positioning.. Patient is standing or sitting next to the upright bucky Place head in a lateral position with side of interest against IR If possible have patient close mouth and bring teeth together  Extend neck (to clear the mandible of the cervical spine) Rotate the head in an oblique direction (the degree of obliquity depend upon the section of manible that is of interest) - the area of interest should be positioned parrallel to the IR

6. How to position the mandible? Head in true lateral position demonstrates ramus   30° rotation demonstrates body 45 ° rotation demonstrates mentum 10° to 15° rotation provides a general survey of mandible CR angled 25°  cephalad Direct CR to exit mandibular region of interest

7. Positioning for Ramus

8. How the image looks like

9. Axiolateral Oblique – Body 30 ° Start from true lateral Oblique head 30° towards IR 25° CR angle CR will exit body on opposite side of mandible Collimate to mandible on all sides

10. Positioning for menti

11. How image looks like…

12. mandible Oblique- General Survey 10° - 15° Oblique head 10°-15° towards IR CR angled 25 ° cephalad Area of interest should be demonstrated w/minimal superimposition & foreshortening

13. Mandible oblique for trauma patients

14. 15- 15 method mandible oblique

15. If the patient cant keep stand etrect The central ray is angled 30 degrees cranially and is centred 5 cm inferior to the angle of the mandible remote from the cassette.

16. Other projections to demonstrate mandible Mandible PA OPG Revers Towns view True Occlusal of mandible to demonstrate Menti . CT

17. Maxilla oblique Occlusal The X-ray tube is positioned towards the side of the face where pathology is suspected and angled downwards ( caudad ) at 65–70 degrees through the cheek.

18. THANK YOU