The effects of sustained incisal clenching on the temporomandibular joint space

Y. Takenami, T. Kuboki, C. O. Acero, K. Maekawa, A. Yamashita, Yoshiharu Azuma

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Objective: To determine the effect of sustained incisai clenching on the width of the temporomandibular joint space. Methods: Nine normal subjects clenched on an anterior appliance for 10 min at 49 N. Sagittal tomograms were obtained during comfortable closure in the intercuspal position (ICP) (ICP- Before), comfortable closure on bite force transducer without clenching (BFT-Before), start of clenching (BFT-0), end of 5 min clenching (BFT-5), end of 10 min clenching (BFT-10), comfortable closure on the bite force transducer immediately after clenching (BFT-After) and comfortable closure in ICP after clenching (ICP-After). Joint space dimensions were automatically measured by a computerized image analysis system. Results: The minimum joint space dimension was significantly reduced at BFT-5 (P = 0.0381), BFT-10 (P = 0.0019) and BFT-After (P = 0.0053) in relation to BFT-Before. The condylar position was also significantly shifted upward at BFT-0 (P = 0.0422), BFT-5 (P = 0.0005), BFT- 10 (P = 0.0001), and BFT-After (P = 0.0004) in relation to BFT-Before. Conclusion: Sustained incisai clenching at 49 N causes significant anterior joint space reduction. We believe this is due to marked compression of the articular cartilage and disc.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalDentomaxillofacial Radiology
Issue number4
Publication statusPublished - 1999


  • Bruxism
  • Temporomandibular disorders
  • Temporomandibular joint

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)


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