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The composition of recrystallized bone mineral
Journal of Dental Research
|December 1, 1983
Summary
Bone mineral and synthetic calcium-deficient carbonate apatite (CDCA) share homologous thermal stability and ignition products. Both transform into dahllite-like structures below 550°C and recrystallize upon further heating.
Area of Science:
- Biomineralization and materials science.
- Chemical and thermal analysis of apatite structures.
Background:
- Bone mineral and synthetic calcium-deficient carbonate apatite (CDCA) are calcium phosphate-based materials.
- Understanding their thermal behavior is crucial for biomaterial applications and bone tissue engineering.
Purpose of the Study:
- To compare the thermal stability and ignition products of bone mineral and CDCA.
- To elucidate the structural transformations of CDCA upon heating.
Main Methods:
- Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were employed.
- X-ray diffraction (XRD) was used to analyze the crystal structures before and after heating.
Main Results:
- Bone mineral and CDCA exhibit homologous thermal behaviors.
- At 550°C, both materials can form a dahllite-like structure.
- Above 550°C, CDCA loses structural carbonate and recrystallizes into whitlockite and/or OH-apatite.
Conclusions:
- Synthetic CDCA serves as a valid model for studying bone mineral's thermal decomposition.
- The structural transformations are dependent on stoichiometry and temperature, offering insights into biomaterial degradation and synthesis.