Calcium Phosphate Bioceramics and Their Characterization Techniques

Calcium phosphate bioceramics are synthetic materials whose chemical composition and structure closely mimic those of natural bone mineral. They encompass hydroxyapatite, β-tricalcium phosphate and their biphasic combinations, each offering distinct resorption kinetics and mechanical properties. Fabrication methods include wet precipitation, sol–gel processing, hydrothermal synthesis, mechanochemical milling and high-temperature sintering, enabling precise control over phase purity, crystallinity and microarchitecture. Key attributes such as porosity, pore interconnectivity and surface topography govern cell attachment, osteoconductivity and vascular ingrowth. Comprehensive characterisation employs X-ray diffraction to identify crystalline phases, Fourier transform infrared spectroscopy to probe functional groups, electron microscopy for morphological and nanoscale imaging, solid-state nuclear magnetic resonance for local atomic environments and micro-computed tomography for three-dimensional reconstruction of scaffold architecture. Mechanical testing and Brunauer–Emmett–Teller surface area analysis inform on strength, elastic modulus and specific surface. Emerging in situ synchrotron techniques and multimodal spectroscopy permit real-time observation of degradation and mineralisation. Such interdisciplinarity underpins applications in orthopaedics, dentistry, maxillofacial reconstruction and drug delivery, where tailored bioceramic scaffolds promote tissue regeneration and controlled therapeutic release.

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Calcium Phosphate Bioceramics and Their Characterization Techniques publication trend

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Technical terms

Hydroxyapatite: Calcium phosphate ceramic (Ca10(PO4)6(OH)2) resembling bone mineral, often used for implants.

β-Tricalcium phosphate: Resorbable calcium phosphate phase (Ca3(PO4)2) employed in bone grafts due to its degradation profile.

Biphasic calcium phosphate: Composite of hydroxyapatite and β-tricalcium phosphate combining long-term stability and controlled resorption.

Mechanochemical synthesis: Production method using mechanical energy (e.g. ball milling) to drive chemical reactions and phase formation.

X-ray diffraction (XRD): Technique for determining crystalline phases and lattice parameters by analysing diffraction patterns.

Fourier transform infrared spectroscopy (FTIR): Method for identifying chemical bonds and functional groups through infrared absorption spectra.

Scanning electron microscopy (SEM): Imaging technique that reveals surface morphology and microstructure at high resolution.

Transmission electron microscopy (TEM): Technique using transmitted electrons to resolve internal nanostructure and crystallography.

Nuclear magnetic resonance (NMR): Spectroscopy probing local atomic environments and bonding in solids through magnetic resonance of nuclei.

Brunauer–Emmett–Teller (BET) analysis: Method for measuring specific surface area by gas adsorption isotherms.

References

1. Synthesis of Hydroxyapatite, β-Tricalcium Phosphate and Biphasic Calcium Phosphate Particles to Act as Local Delivery Carriers of Curcumin: Loading, Release and In Vitro Studies. Materials (2018).
2. Calcium Orthophosphate-Based Bioceramics. Materials (2013).
3. Possibilities of Mechanochemical Synthesis of Apatites with Different Ca/P Ratios. Ceramics (2022).
4. Analysis of the osteogenic and mechanical characteristics of iron (Fe2+/Fe3+)-doped β‑calcium pyrophosphate. Materials Science and Engineering C (2020).