Raquel Osorio1, Inmaculada Cabello2, Antonio L Medina-Castillo3, Estrella Osorio2, Manuel Toledano2. 1. Dental School, Colegio Maximo, University of Granada, Campus de Cartuja s/n, 18017, Granada, Spain. rosorio@ugr.es. 2. Dental School, Colegio Maximo, University of Granada, Campus de Cartuja s/n, 18017, Granada, Spain. 3. NanoMyP, Spin-Off Enterprise, University of Granada, Edificio BIC-Granada. Av. Innovación1, Armilla, 18016, Granada, Spain.
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, dye-assisted 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 zinc-loaded nanoparticles.
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, dye-assisted 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 zinc-loaded nanoparticles.
Authors: Luiz Eduardo Bertassoni; Stefan Habelitz; Megan Pugach; Paulo Cesar Soares; Sally Jean Marshall; Grayson William Marshall Journal: Scanning Date: 2010-09-17 Impact factor: 1.932
Authors: Magali Inglês; Joana Vasconcelos E Cruz; Ana Mano Azul; Mário Polido; António H S Delgado Journal: Polymers (Basel) Date: 2022-09-21 Impact factor: 4.967
Authors: Raquel Osorio; Camilo Andrés Alfonso-Rodríguez; Antonio L Medina-Castillo; Miguel Alaminos; Manuel Toledano Journal: PLoS One Date: 2016-11-07 Impact factor: 3.240
Authors: Manuel Toledano-Osorio; Jegdish P Babu; Raquel Osorio; Antonio L Medina-Castillo; Franklin García-Godoy; Manuel Toledano Journal: Materials (Basel) Date: 2018-06-14 Impact factor: 3.623