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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/46693

Title: Zinc-modified nanopolymers improve the quality of resin-dentin bonded interfaces
Authors: Osorio Ruiz, Raquel
Cabello Malagón, Inmaculada
Medina-Castillo, Antonio L.
Osorio Ruiz, Estrella
Toledano Pérez, Manuel
Issue Date: 30-Jan-2016
Abstract: 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.
Sponsorship: This work was supported by a grant, MINECO/FEDER MAT2014-52036-P.
Publisher: Springer International Publishing
Keywords: Remineralization
Zinc
Nanopolymers
Dentin
Hybrid layer
Adhesives
URI: http://hdl.handle.net/10481/46693
ISSN: 1432-6981
1436-3771
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Osorio Ruiz, R.; et al. Zinc-modified nanopolymers improve the quality of resin-dentin bonded interfaces. Clinical Oral Investigations, 20(9): 2411-2420 (2016). [http://hdl.handle.net/10481/46693]
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