Biomechanical properties of Gyroid structured titanium bionic bone scaffolds for repairing segmental mandibular defects

doi:10.12307/2025.441

Abstract

Abstract: BACKGROUND: Porous structures based on triple periodic minimal surfaces are one of the most promising orthopedic biostructures, among which the Gyroid structure is characterized by high specific surface area, high permeability, and zero mean curvature.
OBJECTIVE: To screen the wall thickness interval of TC4 bionic bone scaffolds with 4 mm single-cell Gyroid structure matching the elastic modulus range of cancellous bone of the mandible through finite element analysis combined with mechanical compression test testing.
METHODS: The finite element model of the 4 mm single-cell Gyroid structure with different wall thickths (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8 mm) was established. The equivalent elastic modulus of the Gyroid structure was analyzed, and the wall thickness interval of the Gyroid structure matching the elastic modulus range of the maxillary resinous bone was selected with different wall thicknesses of 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 mm, respectively. According to finite element analysis screening results, the material selected was Ti6Al4V. Selective laser melting was used to prepare 3D printed Gyroid structure specimens. The surface treatment was carried out by large-grained sand blasting and acid etching. The elastic modulus and compressive strength of the specimen were tested by mechanical compression experiment.
RESULTS AND CONCLUSION: (1) The finite element analysis results showed that the equivalent elastic modulus of the Gyroid structure increased with the increase of wall thickness, and the equivalent elastic modulus of the Gyroid structure with wall thickness of 0.2-0.7 mm was within the range of the elastic modulus of the spongy bone of the mandible (1.5-4.0 GPa), which was used for 3D printing of the Gyroid structure specimen. (2) The mechanical compression test results showed that the elastic modulus and compressive strength of the Gyroid structural specimen increased with the increase of wall thickness, and the elastic modulus of the Gyroid structural specimen with wall thickness of 0.3-0.5 mm was within the range of the elastic modulus of the cancellous bone of the mandible. The compressive strength of the Gyroid specimen with 0.3-0.7 mm wall thickness was consistent with the mechanical properties of the mandible. (3) The results show that the Gyroid structure of 0.3-0.5 mm wall thickness is compatible with the range of elastic modulus of the mandible.

Key words: segmental bone defect, Gyroid structure, 3D printing, selective laser melting, finite element, mechanical property

CLC Number:

Jiang Zhixiu, Ji Yuchen, Liu Danyu, Cao Yilin, Jiang Tingting, Song Yihan, Wang Lei, Wang Xinyu. Biomechanical properties of Gyroid structured titanium bionic bone scaffolds for repairing segmental mandibular defects[J]. Chinese Journal of Tissue Engineering Research, 2025, 29(22): 4621-4628.

Figures/Tables 6

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