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Related Experiment Videos

Ratio between vertical and horizontal mandibular range of motion

P U Dijkstra1, T J Kropmans, B Stegenga

  • 1Department of Oral and Maxillofacial Surgery, University Hospital Groningen, The Netherlands.

Journal of Oral Rehabilitation
|June 25, 1998
PubMed
Summary

The suggested 4:1 ratio for mandibular range of motion (ROM) is inaccurate. This study found the actual vertical to horizontal ROM ratio is approximately 6:1, with poor predictive value.

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Area of Science:

  • Dentistry
  • Biomechanics
  • Orthodontics

Background:

  • Mandibular range of motion (ROM) assessment is crucial for diagnosing temporomandibular joint disorders.
  • A commonly cited 4:1 ratio between vertical and horizontal mandibular ROM lacks scientific validation.
  • This ratio is often used for predictive purposes in clinical settings.

Purpose of the Study:

  • To investigate the existence and predictive value of a fixed 4:1 ratio between vertical and horizontal mandibular ROM.
  • To determine the actual ratio of vertical to horizontal mandibular ROM in healthy individuals.

Main Methods:

  • Vertical and horizontal mandibular ROM were measured in 91 healthy participants (59 women, 32 men) using vernier calipers.
  • Data analysis focused on calculating the ratio between vertical and horizontal ROM and assessing its predictive capability.

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Main Results:

  • The mean ratio of vertical to horizontal mandibular ROM was found to be between 6.0:1 and 6.6:1.
  • Individual ratios varied significantly, ranging from 3.6:1 to 15.5:1.
  • Correlations between vertical and horizontal ROM were weak, indicating poor predictability.

Conclusions:

  • The established 4:1 ratio for mandibular ROM is not supported by scientific evidence.
  • The actual ratio is closer to 6:1, but with considerable individual variation.
  • The mandibular ROM ratio has limited predictive value in clinical assessments.