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Updated: Jan 24, 2026
08:08
Fabrication and Design of Wood-Based High-Performance Composites
Published on: November 9, 2019
14.0K
Starch-Hydroxyapatite Composite Bone Scaffold Fabrication Utilizing a Slurry Extrusion-Based Solid Freeform
Caitlin Koski1, Bonny Onuike1, Amit Bandyopadhyay1
1W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States.
Additive Manufacturing
|May 21, 2019
Summary
This study introduces a novel approach using gelatinized starch as a natural binder in hydroxyapatite (HA) composite scaffolds for bone tissue engineering. The starch-based scaffolds demonstrate improved mechanical strength and enhanced osteoblast cell proliferation, offering a promising alternative for bone disorder treatments.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Ceramic Composites
Background:
- Developing composite scaffolds with calcium phosphate (CaP) for bone disorders via additive manufacturing is challenging due to difficulties incorporating natural polymers.
- Natural polymers are crucial for enhancing scaffold properties in bone and tissue engineering.
Purpose of the Study:
- To investigate the use of a natural polymer binder system, specifically gelatinized starch, in ceramic composite scaffolds fabricated using a ceramic slurry-based solid freeform fabricator (SFF).
- To assess the impact of starch-HA composites on mechanical strength, microstructure, and in vitro biocompatibility for bone regeneration applications.
Main Methods:
- Fabrication of starch-hydroxyapatite (HA) composite scaffolds using a ceramic slurry-based SFF technique.
- Evaluation of mechanical strength, microstructure (FESEM), and in vitro biocompatibility with human osteoblast cells.
- Assessment of parametric effects including solids loading, polycaprolactone (PCL) addition, and designed porosity.
Main Results:
- Starch incorporation significantly improved scaffold mechanical strength from 4.07 ± 0.66 MPa to 10.35 ± 1.10 MPa, approaching cancellous bone strength.
- Proposed a reinforcing mechanism involving interparticle and apatite crystal interlocking attributed to gelatinized starch.
- Enhanced osteoblast cell proliferation was observed with starch and PCL addition, confirmed by FESEM and MTT assays.
Conclusions:
- Gelatinized starch serves as an effective natural binder in SFF-fabricated ceramic composite scaffolds.
- The starch-HA composite scaffolds exhibit improved green strength and superior in vitro biocompatibility.
- This approach offers a promising strategy for developing advanced bone and tissue engineering scaffolds without requiring cross-linking or post-processing.
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