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Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

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Influence of forward head posture on condylar position.

H Ohmure¹, S Miyawaki, J Nagata

¹Department of Orthodontics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.

Journal of Oral Rehabilitation

|September 24, 2008

Summary

Forward head posture causes the jaw condyle to shift backward. This posterior condylar position may contribute to temporomandibular disorders and impact mandibular growth.

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Area of Science:

Orthodontics
Craniofacial Morphology
Biomechanics

Background:

Forward head posture is linked to temporomandibular disorders and restricted mandibular growth.
This may be due to posterior displacement of the mandible.
Limited research exists on condylar position in forward head posture.

Purpose of the Study:

To investigate whether the condyle moves posteriorly in individuals with forward head posture.
To test the hypothesis of posterior condylar displacement associated with forward head posture.

Main Methods:

Recorded condylar position and electromyography of masseter, temporal, and digastric muscles.
Evaluated 15 healthy adult males in natural head posture and deliberate forward head posture.
Measured at the mandibular rest position.

Main Results:

Condylar position was significantly more posterior in deliberate forward head posture compared to natural head posture.
Slight increases in masseter and digastric muscle activity were observed in forward head posture.
Electromyography data showed subtle changes in muscle function.

Conclusions:

The study supports the hypothesis that the condyle moves posteriorly in forward head posture.
Posterior condylar displacement is a potential consequence of forward head posture.
Findings suggest a link between head posture and temporomandibular joint mechanics.