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Age changes in the human frontozygomatic suture from 20 to 95 years
American Journal of Orthodontics
|April 1, 1976
Summary
The human frontozygomatic suture shows progressive fusion, beginning in the eighth decade. Complete fusion does not occur by age 95, with bony union developing internally and on the orbital surface.
Area of Science:
- Anatomy
- Forensic Anthropology
- Gerontology
Background:
- The frontozygomatic suture is a key anatomical landmark.
- Understanding its aging changes is crucial for forensic and anthropological studies.
- Previous research has not fully detailed the aging process and fusion timeline.
Purpose of the Study:
- To determine aging changes in the human frontozygomatic suture.
- To establish the approximate age of sutural fusion.
- To analyze the progression of synostosis.
Main Methods:
- Histologic, radiographic, and gross examination of 61 human cadaver specimens (ages 20-95).
- Bilateral analysis: one side for gross/radiographic synostosis, the other for histology.
- Observations at 5-year age intervals.
Main Results:
- Synostosis begins in the eighth decade of life.
- Fusion is a progressive process, starting internally and moving to the orbital periosteal surface.
- Complete fusion is not achieved by age 95; bony union is absent on the facial periosteal surface.
- Sutural surfaces become more irregular with age due to projections.
Conclusions:
- The frontozygomatic suture undergoes synostosis during the eighth decade.
- Fusion progresses internally and towards the orbital surface, not the facial surface.
- Age-related irregularity of the suture is a significant finding.
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