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Bone regeneration is an advancing field of research
Bone regeneration is an advancing field of research
Much like the structure and hierarchy of bone tissues, the process of bone regeneration remains an enigma and an intense area of research. Our bones stand as silent sentinels, adapting and responding to the stresses and strains imposed by daily life.
Today, it is well known that bone is formed in high-strain areas and removed in low-strain areas. Just like our skin, our skeleton is constantly remodeling and rejuvenating. However, bones are not indestructible or impervious to disease.
Periodontitis, osteonecrosis, osteoporosis and severe injuries can lead to bone loss and defects that extend beyond the innate ability of our bones to heal and recover. But when disease or injury does strike, researchers and clinicians can now look to enhance and support the remarkable rejuvenating ability of our bones. How? By using bio-integrative implants that not only fill the bone defect but also support the natural healing process of the bone tissue.
Due to numerous advantages, bioresorbable materials, such as beta-tricalcium phosphate (β-TCP), are gaining traction in orthopedics and maxillofacial surgery to restore bone loss over titanium and autografts. Researchers and clinicians are experimenting, discovering, and achieving success with 3D-printed ceramic scaffolds and personalized point-of-care implants.
Recent advances in 3D in vitro research are helping researchers better understand and enhance bone regeneration. By breaking free from the traditional cell cultures and performing experiments with 3D microenvironments that mimic natural bone, research not only supports the understanding of bone biology but also the development of tissue engineering and regenerative medicine within the field.
β-TCP scaffold concentration influences natural bone formation
While advances in 3D in vitro models have expanded our understanding of bone regeneration, the success of bio-integrative implants depends strongly on the properties of the scaffold itself. Among these, material composition plays a critical role in guiding cellular behavior, vascularization, and new bone formation. One key parameter under investigation is the concentration of β‑TCP within bioceramic scaffolds.
β-TCP bioceramics historically are known to offer several properties to promote bone tissue regeneration and remodeling (Khayatan et al., 2024):
- Biocompatibility: implantable without adverse reactions
- Osteoconductivity: facilitates bone regeneration
- Bioactivity: promotes interactions with the natural environment
- Mechanical strength: ensures durability and stability
- Porosity: allows for infiltration of cells and fluids
- Resorbability: gradually replaced by natural bone
- Thermal stability: maintains integrity in physiological temperature
In a recent study based on an ectopic mouse model, higher content of β‐TCP in ceramic scaffolds significantly impacted the ability of human bone marrow-derived mesenchymal stem cells (hBMSCs) to support angiogenesis and promote mature osteogenesis. Here, two scaffolds with different concentrations of hydroxyapatite (HA) and β‐TCP were tested in ratios of 60/40 and 20/80.
Results showed that the scaffolds with higher β‐TCP content induced faster and more extensive vascular growth and mature bone deposition compared to those with lower β‐TCP content. The researchers reported that an in vitro culture model using the same scaffolds had a higher rate of released calcium ions from the scaffold with the highest ratio of β-TCP. This, in turn, enhanced vascular endothelial growth factor (VEGF) secretion from hBMSCs and stimulated endothelial cells to form capillaries (Pereira et al., 2019).
These findings demonstrate the influence of bioceramic scaffold composition on bone formation and maintenance. Furthermore, the findings represent another parameter researchers can explore to pave the way for unravelling solutions for specific diseases, conditions and injuries. However, material choice alone is not sufficient to ensure bio-integration and osteogenesis.
Scaffold geometry affects Schwann cell growth and behavior
A key challenge of bone tissue regeneration when using ceramic scaffolds is ensuring sufficient vascularization (Khayatan et al., 2024, Abdullah et al., 2024). While many strategies are being researched and developed in vitro, one promising avenue is facilitating the incorporation of nervous system glia, particularly Schwann cells.
Throughout the body, nerves and blood vessels typically run in parallel, suggesting a natural synergy that can be harnessed for improved vascularization in 3D scaffolds in vitro and ultimately an implant in vivo.
Schwann cells, the myelinating cells of the peripheral nervous system, are known not only for their role in peripheral nerve repair and providing innervation to traditional grafts but also for their significant angiogenic potential through growth factor secretion. These cells wrap around axons to improve signal conduction and assist in neural regeneration after injury, showcasing their versatility and regenerative capabilities.
Research demonstrates that the geometry of a 3D scaffold can affect the functional performance of the Schwann cells. Compared to a random structure, patterned porous scaffolds can induce multiple beneficial behaviors, including cellular alignment, migration, and effectiveness at directing and inducing axonal ingrowth (Sweet et al., 2015).
What may appear as an incremental step in 3D scaffold design can ultimately shape success when incorporated into 3D printed implants for bone loss treatment. As shown in Figure 1, Schwann cells grew and proliferated well on the scaffolds which represent a more realistic 3D microenvironment compared to a culture plate and furthermore showed enhanced growth with the patterned porosity.
Figure 1: Fluorescence staining highlighting the pattern of clustered growth in cell culture plate (a, d, g), on patterned scaffold (b, e, h), and non-patterned scaffolds. Reposted according to the Creative Commons Attribution License from Sweet, L., et al. (2015). Geometrical versus random β-TCP scaffolds: Exploring the effects on Schwann cell growth and behavior. PLoS One, 10(10), e0139820.
Together, these findings highlight that successful bone regeneration depends not only on material composition but also on how scaffolds are architected to guide cellular behavior. By combining bioactive materials with intentional scaffold geometry, researchers can better support functional bone formation. These insights from in vitro research form an important bridge between fundamental scaffold design and their translation into clinically relevant implants.
Personalized point-of-care β-TCP implants
When research continues to build foundational insights, such as patterned scaffold designs and higher β‐TCP compositions, orthopedics and oral and maxillofacial surgeons can take advantage of a longer runway to test personalized point-of-care implants (Maintz et al., 2024). A recent case report revealed how powerful computer-aided design and manufacturing (CAD/CAM) can be when paired with 3D bone printing.
The case report presented a 63-year-old female patient with significant bone loss who was treated with a custom β-TCP implant to regenerate lost bone before receiving a dental implant. In this case, the 3D-printed β-TCP implant was a pre-implant to restore the height and width of a large defect in her alveolar ridge. Based on the patient’s cone-beam computed tomography (CBCT) and intraoral scan, a digitally designed 3D bone-printed implant was fabricated.
At nine months, the custom β-TCP implant successfully integrated into the surrounding bone, allowing dental implant placement. Two years later, the patient demonstrated excellent oral and peri-implant health (Schönegg et al., 2024).
This case exemplifies how advances in scaffold composition, geometry, and digital manufacturing can converge in patient-specific solutions. By translating insights from preclinical research into personalized point-of-care implants, clinicians are beginning to address complex bone defects with greater precision and predictability. Such examples underscore the importance of continued collaboration between research, engineering, and clinical practice.
Leveraging 3D printed β-TCP scaffolds in research
Researchers can leverage 3D printed β-TCP scaffolds in their research on bone physiology, pathology, regenerative medicine, and tissue engineering. The P3D Scaffolds from Ossiform® are bioceramic 3D printed scaffolds made from β-TCP, which mimic the physical properties of bone – with no batch-to-batch variance. The internal structures replicate the architecture and complexity of calcified bone tissue, which lets you create more relevant and reliable tissue- and disease models that capture the complex interplay between various cells.
As bone regeneration research continues to evolve, the integration of biologically relevant materials, optimized scaffold design, and advanced 3D models will be essential to unlocking new therapeutic possibilities. By enabling more physiologically relevant in vitro studies and smoother translation to clinical applications, 3D printed β-TCP scaffolds play a central role in advancing both our understanding of bone biology and the development of next-generation regenerative treatments.
References
- Abdollahi, F., Saghatchi, M., Paryab, A., Malek Khachatourian, A., Stephens, E. D., Toprak, M. S., & Badv, M. (2024). Angiogenesis in bone tissue engineering via ceramic scaffolds: A review of concepts and recent advancements. Biomaterials Advances, 159, 213828.
- Huang, B., Yang, M., Kou, Y., & Jiang, B. (2024). Absorbable implants in sport medicine and arthroscopic surgery: A narrative review of recent development. Bioactive Materials, 31, 272-283.
- Khayatan D, Bagherzadeh Oskouei A, Alam M, et al. Cross Talk Between Cells and the Current Bioceramics in Bone Regeneration: A Comprehensive Review. Cell Transplantation. 2024;33. doi:10.1177/09636897241236030
- Maintz, M., Tourbier, C., de Wild, M., Cattin, P. C., Beyer, M., Seiler, D., … & Thieringer, F. M. (2024). Patient-specific implants made of 3D printed bioresorbable polymers at the point-of-care: material, technology, and scope of surgical application. 3D Printing in Medicine, 10(1), 13.
- Pereira, R. C., Benelli, R., Canciani, B., Scaranari, M., Daculsi, G., Cancedda, R., & Gentili, C. (2019). Beta‐tricalcium phosphate ceramic triggers fast and robust bone formation by human mesenchymal stem cells. Journal of tissue engineering and regenerative medicine, 13(6), 1007-1018.
- Schönegg, D., Essig, H., Al-Haj Husain, A., Weber, F. E., & Valdec, S. (2024). Patient-specific beta-tricalcium phosphate scaffold for customized alveolar ridge augmentation: a case report: Case Report: patient-specific β-TCP scaffold for alveolar ridge CBR. International Journal of Implant Dentistry, 10(1), 21.
- Sweet, L., Kang, Y., Czisch, C., Witek, L., Shi, Y., Smay, J., … & Yang, Y. (2015). Geometrical versus random β-TCP scaffolds: Exploring the effects on Schwann cell growth and behavior. PLoS One, 10(10), e0139820.