TMJ

Question 1

Which is NOT one of the 4 cardinal symptoms of TMJ disorder?

Which of the following is NOT a common symptom of TMD?

Answer 1

ADD (sign not symptom)

Cardinal symptoms of TMD:
Pain, headaches, tenderness
Joint sounds
Limited range of motion (most important)

*NOT one of the TMD symptoms:
Locking (sign not symptom)
Condyle dislocation (sign not symptom)

Question 2

What is NOT seen in acute closed lock patients?

Answer 2

Joint sounds

Closed lock:
Same as *ADD without reduction
Disc is displaced anteriorly at all times
Sudden absence of joint clicking/sounds
Deviation on opening - towards the side that is locked
Opening 27mm or less
Limited lateral movement towards unaffected side, normal lateral movement towards the affected side
Condyle on affected side can only rotate, not translate

Question 3

Which of the following allows application of constant force?

Answer 3

A-NiTi

A-NiTi:
Superelastic NiTi = good for applying constant force over long period of time
Outside mouth: rigid/stiff
Add stress >2mm or cold = becomes martensitic = “stress induced martensitic transformation (SIM)”

Question 4

TMJ differs from other joints in that it is comprised of:

Answer 4

Dense fibrous CT

The articular surfaces of the TMJ are lined by: thin synovial membrane