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Designing for Growth: Structural Insights into 3D-Printed Composite Scaffolds for Bone Repair.

Areonna C Schreiber^1,2, Xifeng Liu^1,2, Asghar Rezaei^1,2

¹Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, Minnesota, USA.

Tissue Engineering. Part A

|May 23, 2026

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Researchers developed a 3D-printable composite scaffold using digital light processing (DLP) for bone tissue engineering. This new material shows promise for treating critical-sized bone defects, offering a viable alternative to traditional bone grafts.

Area of Science:

Biomaterials Science
Regenerative Medicine
Orthopedic Engineering

Background:

Critical-sized bone defects pose significant clinical challenges, often requiring surgical intervention due to limited healing capacity.
Current bone grafting methods like autografts and allografts have limitations including donor site morbidity, availability issues, and risks of disease transmission or failure.

Purpose of the Study:

To develop a novel composite polymer ink for digital light processing (DLP) 3D printing of bone tissue engineering scaffolds.
To create scaffolds with tunable mechanical properties and controlled architecture for load-bearing applications.
To evaluate the mechanical viability and cytocompatibility of the fabricated scaffolds for bone repair.

Main Methods:

Formulation of a composite ink using poly(propylene fumarate) (PPF), poly(caprolactone fumarate) (PCLF), and hydroxyapatite (HA).

Keywords:

3D printing biomaterials bone repair load-bearing tissue engineering

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Fabrication of scaffolds with varying porosities and compositions using DLP 3D printing.

Evaluation through compressive mechanical testing, finite element modeling, and in vitro studies with preosteoblast cells.

Main Results:

DLP-printed PPF/PCLF/HA composite scaffolds demonstrated tunable mechanical properties and controlled architecture.
In vitro studies showed high cell viability (>75%) and sustained proliferation over 7 days.
Scaffold porosity and composition significantly influenced cell proliferative responses.

Conclusions:

DLP-printed PPF/PCLF/HA composite scaffolds offer a mechanically viable and cytocompatible platform for bone tissue engineering.
The tunable properties and architecture make these scaffolds suitable for load-bearing applications.
This approach presents a scalable and customizable alternative to traditional bone grafts for complex bone repair.