Peptide-Based Bioinspired Approach to Regrowing Multilayered Aprismatic Enamel

Area of Science:

• Biomaterials Science
• Dental Research
• Nanotechnology

Background:

• Native enamel matrix proteins inspire the design of biomimetic materials.
• Amelogenin proteins play a crucial role in biomineralization and enamel formation.
• Developing synthetic enamel mimetics is key for tooth repair strategies.

Purpose of the Study:

• To design smaller amelogenin-inspired peptides for clinical translation in tooth enamel repair.
• To investigate the ability of these peptides to control apatite nucleation and crystal growth.
• To evaluate the structural and mechanical properties of the regenerated enamel-like layers.

Main Methods:

• Design and synthesis of amelogenin-inspired peptides with conserved functional domains.
• In vitro assessment of peptide-controlled apatite nucleation and crystallite formation.
• In situ incubation of sectioned human teeth with peptides to promote enamel regeneration.
• Analysis of the hardness, modulus, and interface attachment of regrown layers using mechanical testing.

Main Results:

• Synthetic peptides formed nanostructured scaffolds that controlled apatite nucleation, yielding smaller crystallites.
• Application of peptides to human teeth resulted in robust, oriented, synthetic aprismatic enamel formation within 7 days.
• Regrown enamel-like apatite layers showed a two-fold increase in hardness and modulus, with improved interface attachment.
• Repeated peptide application led to epitaxial growth of multiple, thin hydroxyapatite (HAP) layers with c-axis oriented nanorods.

Conclusions:

• Peptide analogues with active domains effectively regulate the orientation of regenerated HAP layers, influencing functional properties.
• This biofabrication approach enables peptide-mediated growth of organized microscale HAP arrays.
• The study demonstrates a promising strategy for enamel repair and regeneration using bioinspired peptides.