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  • It represents an early stage of disc derangement disorders
  • Cause:
  • Elongation of the capsular and discal ligament, coupled with thinning of the articular disc.
  • These changes commonly result from microtrauma (bruxism) or macrotrauma ( revealed through history).
  • Class II Division 2 malocclusion.
  • History:
  • Macrotrauma
  • Microtrauma- bruxism.
  • Clinical characteristics:
  • Relatively normal range of movement with restriction only associated with pain.
  • Deviation in the opening pathways are common


  • Clinical characteristics:
  • Examination reveals limited mandibular opening(25-30mm) with normal eccentric movement to the ipsilateral side and restricted eccentric movement to the contralateral side.
  • Definitive Therapy:
  • Acute-> 1 week – the initial therapy should attempt to reduce or recapture the disc by manual manipulation.
  • Long history- success begins to decrease rapidly.
  • Stabilization appliance to pts with permanent disc dislocation.

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