Facial Mandible 

 Oblique 
Indications for imaging
Trauma

 

Anatomy  Demonstrated
 Body and ramus of mandible closet to the film.


 Mandible Rt. oblique Anatomy
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy Saunders, London

 

Basic Patient Position
Dentures and oral jewellery should be removed.
The patient sits erect facing the erect film, the head is then turned so that the side of the face is in contact with the bucky, median saggital plane parallel to the film and interpupillary line parallel to the floor, from this position the head is then tilted 20 degrees to bring the skin surface over the body of the  mandible in contact with the bucky. The chin is raised to prevent superimposition of the mandibular structures on the cervical spine. The jaw is closed and teeth occluded.


Mandible Rt. oblique Patient Position
Based on Movin & Karlsson 1975 Skeletal projections for Diagnostic Radiology Lippincott  

 
Radiation protection
Direct lead rubber thyroid protection advisable.

 
Central Ray
The horizontal central ray is centered to the angle of mandible closest tot he film.

 
Exposure Factors
Kv mAS FFD (cm) Grid Focus AEC Cassette
60 12 100 Yes Fine No 18 x 24 cm

 
Evaluation of the Image
 ID and anatomical markers must be present and correct in the appropriate area of the film.
Optimal exposure should penetrate all the bone structures and contrast should be low enough to visualise fully the bone and soft tissue structures.
Limits of examination, superiorly the TMJ of the side nearest the film, inferiorly the skin surfaces of the mandible, posteriorly the ramus of mandible, anteriorly the mandibular symphysis.
The body of the mandible should be clearly visualised from the symphysis to the temporo mandibular joint with minimal superimposition of the spine. The bodies of the mandible should be separated.



Mandible Rt. oblique Radiograph
Related Projections
 Facial Bones OM
Facial Bones OM 30
Facial Bones Lateral
Mandible PA
OPG
Additional modalities
CT