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The Bone Matrix

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...

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Related Experiment Video

Updated: Jul 10, 2026

Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs

Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs

Published on: August 8, 2022

Enhancing DLP Ink Performance for Bone Tissue Engineering via Calcium Phosphate Oligomers and Concurrent Crosslinking

Junzhou Tian¹, Bin He², Yuwei Li¹

¹School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China.

ACS Applied Bio Materials

|July 8, 2026

Summary

Calcium phosphate oligomers (CPO) enhance 3D printing of bone scaffolds. This novel approach improves scaffold properties and promotes bone regeneration, offering a promising solution for bone tissue engineering.

Keywords:

DLP bone repair calcium phosphate oligomers hybrid structure printability

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Published on: September 11, 2015

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Last Updated: Jul 10, 2026

Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs

Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs

Published on: August 8, 2022

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect

Published on: September 11, 2015

Area of Science:

Biomaterials Science
Tissue Engineering
3D Printing

Background:

Conventional calcium phosphate (CaP) inks for 3D printing bone scaffolds exhibit poor printability due to particle heterogeneity and weak interfacial interactions.
The crystallization of CaP before polymer crosslinking compromises scaffold mechanical properties.

Purpose of the Study:

To develop advanced calcium phosphate (CaP)-based inks for Digital Light Processing (DLP) 3D printing of bone scaffolds.
To overcome the limitations of traditional CaP particles by utilizing water-soluble calcium phosphate oligomers (CPO).

Main Methods:

Replaced conventional CaP particles with water-soluble CPO to improve ink dispersion and photopolymerization efficiency.
Achieved an organic-inorganic hybrid structure through concurrent GelMA crosslinking and CPO crystallization during DLP printing.
Optimized CPO formulation (Ca/P ratio 1.67) and ink composition (20% CPO, GC-20) for superior printability and structural integrity.

Main Results:

CPO-based inks demonstrated excellent DLP printability with minimal light scattering and high solid content.
Characterization confirmed CPO conversion to hydroxyapatite (HAp), forming hybrid HAp-GelMA structures with enhanced mechanical properties (compressive modulus and toughness).
In vitro studies showed scaffolds were non-cytotoxic, supported cell adhesion and proliferation, and significantly enhanced osteogenic differentiation and mineralization.

Conclusions:

CPO-based DLP inks offer superior printability and mechanical properties for bone tissue engineering scaffolds.
The concurrent crosslinking and crystallization strategy creates robust organic-inorganic hybrid structures.
These findings support the potential of CPO-based DLP inks for personalized bone and cartilage regeneration applications.