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Does condylar height decrease more in temporomandibular joint nonreducing disc displacement than reducing disc

Ying-Kai Hu1, Chi Yang, Xie-Yi Cai

  • 1Department of Oral Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai Shanghai Key Laboratory of Stomatology, Shanghai, People's Republic of China.

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Anterior disc displacement without reduction (ADDwoR) in the temporomandibular joint (TMJ) significantly decreases condylar height, particularly during puberty. Early disc repositioning is recommended to prevent mandibular development disturbances.

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Area of Science:

  • Temporomandibular Joint Disorders
  • Orthodontics
  • Radiology

Background:

  • Anterior disc displacement (ADD) is a common temporomandibular joint (TMJ) disorder.
  • Understanding condylar height changes is crucial for assessing TMJ development and treatment efficacy.

Purpose of the Study:

  • To quantitatively compare condylar height changes in patients with anterior disc displacement with reduction (ADDwR) versus anterior disc displacement without reduction (ADDwoR).
  • To provide data for optimizing treatment protocols for TMJ disc displacement.

Main Methods:

  • Longitudinal retrospective study of 206 TMJ joints in 156 patients.
  • Patients categorized into ADDwR and ADDwoR groups based on MRI.
  • Quantitative assessment of condylar height at initial and follow-up visits.
  • Age subgroups analyzed: <15, 15-21, and 22-35 years.
  • Statistical analysis using paired and independent t-tests.

Main Results:

  • Condylar height showed a greater tendency to decrease in the ADDwoR group compared to the ADDwR group.
  • This decrease was more pronounced during the pubertal growth spurt and in cases with co-existing osteoarthrosis.
  • ADDwoR was associated with significant disturbances in mandibular development.

Conclusions:

  • Anterior disc displacement without reduction poses a greater risk of condylar height reduction and subsequent mandibular developmental issues.
  • Early intervention, specifically disc repositioning, is advised for ADDwoR to mitigate negative impacts on condylar height and facial growth.