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The postglenoid tubercle: prevalence and growth
Elias G Katsavrias1, J M H Dibbets
1Department of Orthodontics, School of Dentistry, University of Athens, Greece. elkats@otenet.gr
Summary
The postglenoid tubercle is present in most human temporomandibular joints and nearly reaches its full size by age 13, showing good symmetry. This study quantifies its prevalence and growth in children and adults.
Area of Science:
- Anatomy
- Anthropology
- Orthodontics
Background:
- The postglenoid tubercle is a bony prominence in the temporal bone.
- Its development and prevalence in different age groups are not fully understood.
Purpose of the Study:
- To determine the prevalence of the postglenoid tubercle in human skulls.
- To analyze the growth and development of the postglenoid tubercle in children.
- To assess the symmetry of the postglenoid tubercle.
Main Methods:
- Analysis of 90 human skulls (ages 2 to adult).
- Evaluation of 64 corrected lateral tomograms of temporomandibular joints in children (ages 9-11).
- Measurement of tubercle height from silicone impressions and identification on tomograms.
Main Results:
- The postglenoid tubercle was present in 79% of skulls.
- It reached near-final dimensions by age 13.
- 66% of children exhibited a postglenoid tubercle on tomograms.
Conclusions:
- A high prevalence of the postglenoid tubercle exists in human temporomandibular joints.
- Postglenoid tubercle growth is largely complete by age 13.
- Right-left symmetry was observed.