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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.
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.
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