3D Printing Realizes Regeneration Of Broken Bones, Which Will Revolutionize Regenerative Medicine

In recent decades, medical science has made significant progress, providing innovative solutions for previously difficult diseases. A published study showed that a method of using 3D printing to regenerate bone tissue can revolutionize regenerative medicine.

Regenerative medicine is a branch of medical science that develops therapies to replace tissues, organs and cells damaged by diseases, defects or injuries. This is a brand new field of medical science, which is expected to help patients with diseases and injuries that were previously difficult to treat.

Nano-structured bioactive materials have attracted attention in this field due to their regenerative capabilities. They replicate the characteristics of natural tissues and imitate their structure. These advanced medical materials can be processed and applied using 3D printing and other technologies.

Regenerating bone tissue: an important medical advance

Aging can lead to progressive health problems. Diseases such as osteoporosis will occur as patients age, causing pain to individuals and increasing the burden of medical care. Traditional treatments include bone grafts. In addition, other methods cannot imitate the characteristics and structure of natural tissues. For this reason, several new research fields including bone tissue engineering have been developed.

The field of bone tissue engineering involves the development of biomimetic devices that support bone growth and induce regeneration. Advanced bioactive materials are 3D printed into functional scaffolds for use in bone tissue engineering technology.

These interact with target tissues and induce therapeutic responses. The composite material is based on type 1 collagen and hydroxyapatite (also commonly used in dentistry) because they are the main components of bone tissue.

The composite biomimetic material produces an osteopathic response, which induces growth, proliferation, and even differentiation. This leads to the regeneration of bone tissue. The commonly used 3D printing technology in material manufacturing in the field of bone tissue engineering is extrusion molding. This is due to its versatility and scalability. However, there are still several key challenges in manufacturing robust and durable bionic materials for bone regeneration applications.

Changes in viscosity (A) and viscoelastic properties of GEN-Coll/nanoHA (B) and GEN-Coll/MBG_Sr4% (C) at 10 °C

Type 1 bovine collagen is a promising material for regenerating damaged or diseased bone tissue. These bioactive materials contain functionally rich nanoparticles and can be easily 3D printed using a support bath. However, there are some problems with their use. They are difficult to completely remove after the printing process, and the cross-linking agent used to improve the structural integrity of the stent will cause the loss of geometric clarity and partial collapse of the printed structure.

Alternative processes are needed to overcome the limitations of these biomaterials.

Now, the research team has proposed a method to make stronger and more suitable bioactive materials based on bovine collagen, which will help revolutionize the technology of human bone tissue regeneration.

The process reported in the paper aims to improve the properties of bovine collagen formation. The crosslinking agent is added to the printing formulation, and then they are removed from the support bath. The cross-linking agent of choice is genipin, which improves the stability of the collagen 3D printed scaffold structure by triggering in-situ cross-linking.

The solution used for the support bath is alginic acid. Studies have found that alginic acid maintains the 3D printed structure of the collagen material and is easily removed at 37 o C, which allows stable processing of structures with high-resolution geometric structures. The method was developed using a previously established protocol.

After incubating for 3 hours and 24 hours at 37°C, perform amplitude scan test (A, C) and temperature ramp (B, D) on GEN-Col/nanoHA

Select honeycomb and grid geometry to evaluate the printability of the material. Several experiments were performed with different parameters to provide a good level of control and provide an understanding of the results. The influence of each parameter on the fidelity of printing and the resolution of the final scaffold structure constitutes the basis of the change.

The study concluded that these parameters need to be fine-tuned to achieve the desired results because they are intertwined.

The visual analysis of the printing bracket confirmed that the printing process successfully realized geometric reproduction. Clear lines and holes are produced. After lyophilization, the morphology was analyzed by FE-SEM, which showed that the nanoparticles were successfully distributed in the matrix.

These results indicate that the use of this process for 3D printing of collagen materials shows good results in bone tissue regeneration.