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Temporomandibular Joint Space in Mandibular Prognathism
Dongsun Shin1, Hye In Keum2, Seung Rim Yoo2
1Department of Webtoon Animation, Sehan University, Dangjin.
The Journal of Craniofacial Surgery
|March 13, 2024
Summary
Patients with prognathic mandibles have a narrower temporomandibular joint (TMJ) space compared to those with normal mandibles. This finding, based on computed tomography scans, highlights differences in TMJ morphology related to jaw structure.
Area of Science:
- Dentistry
- Orthodontics
- Radiology
Background:
- The temporomandibular joint (TMJ) connects the mandible to the skull, and its morphology can be influenced by skeletal patterns.
- Mandibular prognathism, characterized by a protruded lower jaw, may affect TMJ dimensions.
- Understanding TMJ space variations is crucial for diagnosing and managing skeletal discrepancies.
Purpose of the Study:
- To compare the temporomandibular joint (TMJ) space in individuals with normal mandibles versus those with prognathic mandibles.
- To investigate the relationship between mandibular skeletal classification and TMJ dimensions.
- To provide quantitative data on TMJ space differences in a Korean population.
Main Methods:
- A comparative study involving 68 Korean individuals.
- Classification into two groups based on SNB angle: Group 1 (normal mandible) and Group 2 (prognathic mandible).
- Measurement of TMJ space using computed tomography (CT), defined as the distance between the condylar process and the mandibular fossa.
Main Results:
- A statistically significant difference in TMJ space was observed between the two groups (P<0.01).
- The mean TMJ space in the normal mandible group (Group 1) was 1.94±0.07 mm.
- The mean TMJ space in the prognathic mandible group (Group 2) was significantly narrower at 1.50±0.05 mm.
Conclusions:
- This study confirms that individuals with prognathic mandibles exhibit a narrower TMJ space compared to those with normal mandibles.
- The findings suggest a correlation between mandibular skeletal morphology and TMJ dimensions.
- Computed tomography is a reliable method for assessing TMJ space in relation to skeletal classification.
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