Dental Enamel as a Blueprint for Biomimetic and Bioinspired Hierarchical Materials in Composite Applications

Tooth enamel, the hardest and most mineralized tissue in the human body, derives its exceptional stiffness, hardness, and wear resistance from a finely tuned hierarchical architecture built from hydroxyapatite nanocrystals. Despite this robustness, enamel lacks regenerative capacity and remains susceptible to acid-induced demineralization and cumulative microdamage, creating persistent clinical challenges. Conventional restorative materials provide functional tooth replacement but cannot reproduce enamel’s anisotropic structure, graded interfaces, or multiscale toughening mechanisms, limiting their long-term durability. Recent advances in biomimetic design have focused on replicating key architectural and functional features of natural enamel. Strategies employing controlled crystallite alignment and engineered organic–inorganic interfaces have enabled significant progress in fabricating enamel-mimetic materials. Techniques such as layer-by-layer deposition, 3D printing, freeze casting, and self-assembly have produced constructs with improved hardness, modulus, fracture toughness, and, in some cases, added functionalities including antibacterial activity, ion release, or interfacial remineralization. However, reproducing enamel’s full multiscale hierarchy and achieving scalable, clinically reliable fabrication remain major challenges. Continued development of hybrid fabrication approaches and comprehensive biological validation will be essential for translating enamel-inspired materials into practical restorative solutions.