Tunable polymer-peptide hybrids for dentin tissue repair.

Area of Science:

• Biomaterials Science
• Dental Materials
• Nanotechnology in Dentistry

Background:

• Dentin bonding is crucial for restorative dentistry.
• Demineralized dentin requires effective remineralization strategies.
• Polymeric nanoparticles offer potential for targeted drug delivery and material enhancement.

Purpose of the Study:

• To assess the remineralization capability of conditioned dentin infiltrated with polymeric nanoparticles (NPs) doped with tideglusib (TDg).
• To evaluate the effect of TDg-doped NPs on the mechanical and chemical integrity of the resin-dentin interface.
• To investigate the formation of reparative dentin and collagen quality after infiltration.

Main Methods:

• Dentin surfaces were conditioned and infiltrated with NPs and TDg-NPs.
• Bonded interfaces were created and subjected to mechanical loading and thermocycling.
• Evaluations included nanohardness testing, Masson's trichrome staining, and Raman spectroscopy.

Main Results:

• TDg-NPs treatment significantly increased nanohardness at the hybrid layer, especially after load cycling.
• Active remineralization and new dentinal tubule formation were observed underneath the hybrid layer.
• Raman analysis indicated increased mineralization, carbonate apatite formation, and improved collagen crosslinking.

Conclusions:

• Mechanical loading on TDg-NPs infiltrated dentin enhances mineralization at the resin-dentin interface.
• Tideglusib infiltration improves collagen quality and matrix organization for apatite nucleation.
• TDg-NPs ensure chemical stability and integrity of the resin-dentin interface in demineralized dentin.