ANKYLOSIS OF TMJ

CLASSIFICATION:

1. Based on type of tissue causing Ankylosis:

2. Based on the Side Involved :

  • Unilateral Ankylosis
  • Bilateral Ankylosis

3. Based on Severity of Ankylosis:

  • Partial
  • Complete

4. Based on Etiology of Trismus:

  • Pseudo Ankylosis
  • True Ankylosis

SAWHNEY’S CLASSIFICATION:

Grading of Ankylosis in Children

CLINICAL FEATURES:

INVESTIGATIONS:

1. Radiographs:

– OPG

OPG: *Helps in bilateral comparison of the joint.**The antigonial notch can be appreciated in this type of radiograph.

-PA VIEW:

PA View:Medio-lateral extent of bony growth can be seen on this radiograph.

– Lateral Oblique View of Mandible:

Ankylotic mass can seen in the Anteroposterior direction.

2. Lateral Cephalogram:

Periodic radiographs taken can help to estimate growth of the jaw.

3. CT Scan:

Helpful as it gives an accurate picture of proximity of ankylotic mass to important structure,that cannot be seen in a radiograph.

CT Scan: Ankylosed TMJ

RADIOGRAPHIC FEATURES:

  • Decreased ramus height on the affected site.
  • Lack of joint space.
  • Normal joint space obliteration by bone/fibrous growth.
  • Elongation of coronoid process.
  • Deep antigonial notch.

REFERENCES:

  • Textbook of Oral & Maxillofacial Surgery, Chitra Chakravarthy (2nd Edition).
  • DentalHypothesis.com
  • Europe PMC
  • PocketDentistry.com
  • SciELO.com

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