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Scanning electron microscope observations of heat-treated human bone
J L Holden1, P P Phakey, J G Clement
1Department of Physics, Monash University, Clayton, Victoria, Australia.
Forensic Science International
|June 30, 1995
Summary
Heating human bone causes significant ultrastructural changes, including organic combustion and mineral recrystallization. These heat-induced bone alterations are crucial for forensic science and archaeology.
Area of Science:
- Forensic Anthropology
- Materials Science
- Biomaterials
Background:
- Human bone tissue undergoes physical and chemical changes when exposed to high temperatures.
- Understanding these transformations is critical for interpreting skeletal remains in forensic and archaeological contexts.
Purpose of the Study:
- To investigate the ultrastructural alterations in human bone tissue subjected to controlled heating.
- To correlate these changes with heating temperature, duration, and donor age.
Main Methods:
- Human femoral bone samples from various age groups were heated at temperatures ranging from 200°C to 1600°C for different durations.
- Scanning electron microscopy (SEM) and microradiography were employed to analyze macroscopic and ultrastructural changes.
Main Results:
- Macroscopic changes included discoloration, shrinkage, fracturing, and distortion.
- Ultrastructural analysis revealed organic component combustion below 400°C and bone mineral recrystallization starting at 600°C.
- Crystal morphology varied (spherical, hexagonal, platelets, rosettes, irregular), with growth and sintering observed at higher temperatures; melting occurred at 1600°C.
Conclusions:
- Heat-induced changes in bone morphology are dependent on temperature, heating duration, and donor age.
- These findings provide valuable insights for forensic scientists and archaeologists analyzing cremated human remains, aiding in the determination of life history and circumstances of death.