TMJ Disorders Flashcards

1
Q

What type of joint is the TMJand what are the components?

A
  • Hinge (arthroidal)
  • sliding (ginglymo)
  • Components: condyle, glenoid fossa (Squamous temporal bone), articular disk, joint capsule, extrinsic and intrinsic ligaments
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2
Q

Describe jaw movmeent and disc mechanics

A
  • with small mouth opeing, hinge motion allows condyle to rotate on disc
  • with wide mouth opening, sliding motion necessary to allow condyle to slide forward along disk and stops at articular eminence
  • Articular disk is responsible for bidirectional motion
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3
Q

What muscles act on the TMJ?

A
  • Proper
    • Masseter - closure
    • Temporalis - closure and retrusion
    • Medial pterygoid - closure and protrusion
    • Lateral pterygoid
      • superior (insert onto disk)- closure, retrusion
      • inferior (insert onto condyle) - opening and protrusion
  • Complementary
    • digastric - opening
    • Geniohyoid - opening
    • infrahyroid - fixation of hyoid
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4
Q

What are the extrinsic ligaments of the TMj

A
  • stylomanidbular
  • sphenomandibular
  • lateral temporomanidbular
  • pterygomandibular
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5
Q

How do you clasify TJ Disorders

A
  • Muscle-realted = Myogenous
  • Joint-related = arthrogenous
    • DDD = disk displacement disorder
    • DJD = dgenertive joint disease
    • systemic arthritis
    • recurrent dislocaiton
    • infection
    • ankylosis
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6
Q

What is centric relation and central occlusion

A
  • C. relation - positon of TMJ with condyle in most retruded and non -restraied position in the glenoid fossa
  • C. occlusion - position of mandible with maxillary and mandibular teeth in maximal intercuspation
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7
Q

What happens with the disk during joint opening and closure

A

Closure ->superior lat pterygoid attached to anterior disk, stabilizes disk during closure

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8
Q

Whta is normal interincisal opening and normal protrusion.lateral displacement

A

40-50mm

10mm

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9
Q

What is your management of a ptient presenting with TMJ pain

A

HISTORY

  • Clasic triad
    • Pain: if muscle - better with motion, if joint - worse w activity
    • Limited ROM
    • Clicking/crepitus
    • clicking in am - nocturnal bruxism
    • clicking w pain - internal derangement
    • crpitus - disk perforation/calcification, meniscal tear

PHYSICAL EXAM

  • ROM
  • OCclusion
  • cliking/crepitus, tenderness of TMJ
  • masticatory musculature hypertrophy
  • head posture, general H&N, including CN7 fx

Investigation

  • ESR, CRP, RF, ANA, uric acid
    *
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10
Q

6479863203

A
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