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Updated: May 17, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

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Structural study of octacalcium phosphate bone cement conversion in vitro.

Marco Fosca¹, Vladimir S Komlev, Alexander Yu Fedotov

¹Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere, 100-00133 Rome, Italy.

ACS Applied Materials & Interfaces

|October 24, 2012

Summary

The precursor phase in bone biomineralization is clarified. Octacalcium phosphate bone cement hardening requires chitosan and simulated body fluid (SBF) to form the final hydroxyapatite phase.

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Area of Science:

Biomaterials Science
Biomineralization Research
Materials Chemistry

Background:

The precise precursor phase in bone biomineralization remains debated, with octacalcium phosphate (OCP) being a proposed intermediate.
Understanding this process is crucial for developing advanced bone regenerative biomaterials.

Purpose of the Study:

To investigate the structural evolution of OCP-based bone cement during hardening.
To determine the role of chitosan and simulated body fluid (SBF) in the biomineralization of OCP.

Main Methods:

In situ monitoring of structural changes using energy dispersive X-ray diffraction (EDX).
Morphological characterization using scanning electron microscopy (SEM).
Evaluation of OCP-based cement systems with varying combinations of chitosan and SBF.

Main Results:

The final hydroxyapatite (HA) phase formation was exclusively observed in the presence of chitosan and/or SBF.
Structural and morphological changes during OCP cement hardening were dependent on the presence of these additives.
EDX and SEM provided real-time insights into the phase transformation and microstructure development.

Conclusions:

Chitosan and SBF are essential components that facilitate the transformation of OCP to the stable HA phase in bone cement.
These findings offer new perspectives on in vivo biomineralization mechanisms.
The study supports the development of novel biomaterials for bone tissue engineering and regeneration.