Remineralizing potential of a fluoride varnish modified by bioactive nanoparticles

Authors

  • Alyssa Teixeira Obeid Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, SP, Brazil. https://orcid.org/0000-0001-9298-1114
  • Marilia Mattar de Amoêdo Campos Velo Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, SP, Brazil. https://orcid.org/0000-0001-7841-9459
  • Tatiana Rita de Lima Nascimento Universidade Federal da Paraíba, Centro de Pesquisa em Combustíveis e Materiais, Departamento de Química, João Pessoa, PB, Brazil. https://orcid.org/0000-0002-3461-2318
  • Denner Leopoldino Esperança Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, SP, Brazil. https://orcid.org/0000-0002-8046-7174
  • Laís Santos Albergaria Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, SP, Brazil. https://orcid.org/0000-0002-0294-4385
  • Juliana Fraga Soares Bombonatti Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, SP, Brazil. https://orcid.org/0000-0002-4046-8375

DOI:

https://doi.org/10.4322/bds.2024.e4246

Abstract

Objective: Evaluate a fluoride varnish modified by nanostructures with the bioactive qualities of silica (SiO2) and niobium pentoxide (Nb2O5), testing its remineralizing potential by surface hardness (SH) and energydispersive X-ray spectroscopy (EDX). Material and Methods: Bovine enamel specimens (6×4×2mm) were prepared and submitted to a demineralizing/remineralizing process to produce a subsurface caries-like lesion, evaluated by transversal microradiography image (TMR) and subsequently distributed randomly into three groups: fluoride varnish (VZ); fluoride varnish + silica gelatin (VZ-SiO2) and fluoride varnish + niobium nanoparticles (VZ-Nb2O5). The specimens were subjected to a pH-cycling demineralizing/remineralizing process for 7 days at 37ºC. The %SH loss and %SH recovery (after the pH-cycling regimen) were calculated (n=10/group). The Ca/P weight ratio before and after the pH-cycling regimen was evaluated through SEM/EDX. A two-way ANOVA followed by Tukey’s test (p<0.05) was performed for hardness and EDX. Results: TMR image showed the formation of an artificial subsurface lesion, and a significant SH increase was observed in the VZ-Nb2O5 group (p<0.05). Regarding the %SHL and %SHR, the VZ-Nb2O5 and VZ-SiO2 were significantly different compared to the VZ group (p<0.001), but VZ-Nb2O5 presented higher values. The Ca/P ratio showed that blocks treated with VZ-SiO2 and VZ-Nb2O5 showed greater ion deposition, particularly in the presence of Nb. Conclusion: The bioactivity of niobium facilitated greater interaction between the enamel and the varnish, leading to a slow release of nanoparticles and a longer-lasting remineralizing effect.

KEYWORDS

Fluorides; Nanostructures; Niobium; Operative dentistry; Tooth remineralization.

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Published

2024-07-16

Issue

Vol. 27 No. 2 (2024): Apr - Jun / 2024 - Published Apr 2024

Section

Clinical or Laboratorial Research

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