What they found
TL;DR (mlx-community/Qwen3.5-35B-A3B-4bit): This review discusses how 3D-printed bioceramic scaffolds can actively respond to external physical stimuli to improve bone regeneration. It highlights techniques like digital light processing and direct ink writing to create materials that trigger biological responses such as bone growth and infection fighting.
Extensive bone defects complicated by infection, malignancy, or metabolic disorders remain a critical clinical challenge, as conventional calcium phosphate bioceramics provide only passive osteoconductive support. The integration of additive manufacturing with external physical stimuli, such as mechanical, piezoelectric, photothermal, magnetothermal, and ultrasonic, has catalyzed a paradigm shift from static scaffolding to responsive therapeutic platforms. This review examines how advanced techniques, including digital light processing (DLP), direct ink writing (DIW), and two-photon lithography (TPL), enable precise architectural programming of porosity, topology, and compositional gradients, establishing the physicochemical foundation for efficient field coupling. We dissect the mechanisms by which field-active bioceramics transduce external stimuli into bioelectrical, thermal, and mechanical cues, activating the mechanotransduction pathway that orchestrates osteogenic differentiation, immunomodulation, angiogenesis, and antibacterial activity. Particular emphasis is placed on multifunctional strategies, including tumor ablation-to-regeneration transitions, antibacterial-to-osteogenic modality switching, and 4D-printed shape memory architectures, alongside emerging self-powered systems harvesting endogenous mechanical energy. By elucidating the synergistic interplay among scaffold structure, material composition, and external field stimulation, this review establishes design principles for next-generation biomaterials that adaptively respond to complex bone-defect microenvironments.
How this applies to our program
While the paper focuses on bone, the mechanotransduction pathways and responsive scaffold designs described could inform strategies for engineering hair-cell environments that adapt to mechanical or electrical stimuli. The concept of integrating external field stimulation to drive cellular differentiation may offer new approaches for stimulating hair-cell regeneration in STRC/DFNB16 research.
Key numbers
- Three specific additive manufacturing techniques are mentioned: digital light processing (DLP), direct ink writing (DIW), and two-photon lithography (TPL)
- Four types of external physical stimuli are integrated: mechanical, piezoelectric, photothermal, and magnetothermal
- Four biological outcomes are activated: osteogenic differentiation, immunomodulation, angiogenesis, and antibacterial activity
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