Transcranial Technique Of TMJ

The Transcranial Technique Of TMJ

Write a short note on transcranial view.
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Write a short note on the transcranial technique of TMJ.
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Transcranial View

It is an extraoral radiographic view of the temporomandibular joint. It is also known as the Lindblom technique

• This technique is most useful in detecting arthritic changes in the articular surface.
• It helps to evaluate the joint bony relationship.
• Changes on the central and medial surface are not seen.

Transcranial TMJ radiography

“Benefits Of Using The Transcranial Technique For TMJ”

Film Position

The cassette is placed flat against the patient’s ear and centered over the TMJ of interest, against facial skin parallel to the sagittal plane.

Transcranial Technique of TMJ – Radiographic Method

Position of Patient

• The patient’s head is adjusted so that the sagittal plane is vertical.
• The ala tragus line is parallel to the fold.
• View is taken with the patient’s mouth in three positions, i.e.
  • Open mouth.
  • Rest position.
  • Closed mouth.

Temporomandibular joint X-ray

Transcranial TMJ technique

“Risk Factors For Complications With The Transcranial Technique”

Central Ray

The point of entry of rays is different according to different techniques:

• Postauricular or Lindblom technique: Point of entry of central ray is ½ inches behind and 2 inches above the auditory meatus.
• Grewcock’s approach: Central ray enters through a point 2 inches above the external auditory meatus.

TMJ Imaging – Transcranial Radiography

• Gill’s approach: Central ray enters through a point ½ inches anterior and 2 inches above the external auditory meatus.

In all the above three techniques central ray is directed caudally at an angle of +20° to + 25°.

“Steps Involved In The Transcranial Technique Of Tmj”

Exposure Parameter

kVp: 70.

mA: 7.

Seconds: 1.5.

TMJ radiographic techniques

“The Role Of The Transcranial Technique In Diagnosing Tmj Dysfunction”

Uses of the transcranial technique or transcranial View

• This view is very useful in detecting the articulating surface changes that are caused by the various forms of arthritis.
• The relationship of the condyle to the articulating surface of the joint is viewed in this radiograph.

TMJ condyle radiograph

How to Perform a Transcranial View of TMJ

• The transcranial view shows the lateral oblique view of the condylar head as well as the articular fossa. It also shows very minute, subtle bony irregularities on the lateral bony surfaces.