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Correlation between centric relation–maximum intercuspation discrepancy and temporomandibular joint dysfunction.

Shu Shu He1, Xiao Deng, Peter Wamalwa

  • 1Department of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu, Sichuan, China.

Acta Odontologica Scandinavica
|October 15, 2010
PubMed
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Centric relation-maximum intercuspation (CR-MI) discrepancy is common in orthodontic patients with temporomandibular joint dysfunction (TMD). This discrepancy may contribute to TMD development.

Area of Science:

  • Dental occlusion
  • Temporomandibular joint disorders
  • Orthodontic treatment

Background:

  • Temporomandibular joint dysfunction (TMD) affects masticatory function.
  • Orthodontic patients may exhibit signs and symptoms of TMD.
  • Understanding the relationship between dental occlusion and TMD is crucial.

Purpose of the Study:

  • To investigate the link between centric relation-maximum intercuspation (CR-MI) discrepancy and TMD.
  • To assess this relationship in pre-treated orthodontic patients.

Main Methods:

  • Compared 107 pre-treated orthodontic patients with TMD (experimental group) to 70 healthy students (control group).
  • Assessed psychological condition, masticatory musculature, and temporomandibular joint (TMJ) function using questionnaires and clinical examinations (Helkimo indices).

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  • Measured condylar position differences between CR and MI using a condyle position indicator after mounting dental casts on a semi-adjustable articulator.

    • Main Results:

    • A significant CR-MI discrepancy (exceeding 1mm vertically/horizontally or 0.5mm transversely) was found in 72.9% of the experimental group versus 11.4% of the control group (P < 0.001).
    • CR-MI discrepancy showed a significant correlation with both the anamnestic dysfunction index (Ai) and clinical dysfunction index (Di) (P < 0.01).

    Conclusions:

    • Most pre-treated orthodontic patients with TMD signs and symptoms exhibit CR-MI discrepancy.
    • This occlusal discrepancy is a potential contributing factor to the development of TMD in these patients.