3 research outputs found
Zinc-modified nanopolymers improve the quality of resin-dentin bonded interfaces
Introduction: Demineralized collagen fibers at the hybrid layer are susceptible to degradation. Remineralization may aid to
improve bond longevity.
Objectives: The aim of the present study was to infiltrate zinc and calcium-loaded polymeric nanoparticles into demineralized
dentin to facilitate hybrid layer remineralization.
Materials and methods: Zinc or calcium-loaded polymeric nanoparticles were infiltrated into etched dentin, and Single Bond Adhesive was applied. Bond strength was tested after
24 h and 6 months storage. Nanomechanical properties, dyeassisted confocal laser microscopy, and Masson’s trichrome
staining evaluation were performed to assess for the hybrid layer morphology, permeability, and remineralization ability
after 24 h and 3 months. Data were analyzed by ANOVA and Student–Newman–Keuls multiple comparisons tests (p < 0.05).
Results: Immediate bond strength was not affected by nanoparticles infiltration (25 to 30 MPa), while after 6 months, bond strengths were maintained (22 to 24 MPa). After
3 months, permeability occurred only in specimens in which nanoparticles were not infiltrated. Dentin remineralization, at
the bottom of the hybrid layer, was observed in all groups.
After microscopy analysis, zinc-loaded nanoparticles were shown to facilitate calcium deposition throughout the entire
hybrid layer. Young’s modulus at the hybrid layer increased from 2.09 to 3.25 GPa after 3 months, in specimens with zinc nanoparticles; meanwhile, these values were reduced from
1.66 to 0.49 GPa, in the control group.
Conclusion: Infiltration of polymeric nanoparticles into demineralized dentin increased long-term bond strengths.
Zinc-loaded nanoparticles facilitate dentin remineralization within the complete resin–dentin interface.
Clinical relevance: Resin–dentin bond longevity and dentin remineralization at the hybrid layer were facilitated by zincloaded
nanoparticles.This work was supported by a grant, MINECO/FEDER MAT2014-52036-P