A High-Strength, Tough, and Low-Modulus Bamboo Fiber Dental Post with Precisely Tunable Mechanical Properties for Advanced Customized Dental Restoration

The mechanical mismatch between dental post materials and dentin poses a significant threat to the success of caries restoration, making it a major concern for patients worldwide. To address the current limitations in the mechanical properties of dental post materials, we ingeniously employ natural bamboo fiber, which closely matches the mechanical properties of dentin, as a substitute for conventional synthetic fibers, fundamentally enhancing mechanical compatibility. Meanwhile, a heterogeneous multi-mechanism synergistic reinforcement strategy was proposed. The incorporation of aminated bacterial cellulose not only constructed a multiscale structure with hydrogen–covalent bond-coupled interfaces and multiple energy dissipation pathways, but also enabled the functional integration of mechanical performance and antibacterial activity. This strategy led to the development of a novel antibacterial bamboo fiber post with ultrahigh strength (580.02 MPa), outstanding toughness (94.89 J/cm 2 ), and a low elastic modulus. Furthermore, the robust and tunable three-dimensional bacterial cellulose energy network allowed precise regulation of interfacial stress transfer and dissipation, enabling customized mechanical design of the bamboo fiber post. Comprehensive evaluations—including biocompatibility, antibacterial activity, chewing stress simulation, light transmittance, and esthetic performance—further confirm the material’s strong potential for clinical application. This work opens new avenues for the biomedical application of bamboo fiber.