Effect of enamel pretreatment on the fluoride remineralization of artificial white spot lesions

Authors

  • Diana Ferreira Gadelha Araújo Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil. Department of Odontology – Federal University of Rio Grande do Norte – Natal – RN – Brazil.
  • Fernanda Sandes de Lucena Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Maria Cristina Carvalho de Almendra Freitas Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil. DeVry FACID – DeVry Education Group – Teresina – PI – Brazil.
  • Larissa Vasconcellos Nunes Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Marília Mattar de Amoedo Campos Velo Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Ana Carolina Magalhães Department of Oral Biology – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Linda Wang Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.

DOI:

https://doi.org/10.14295/bds.2018.v21i3.1585

Abstract

Objective: The topical fluoride application is the main strategy to remineralize white spots lesions (WSL). It is assumed that increasing its retention in the surface can favor remineralization. Therefore, previous treatments of the enamel surface are purposed to optimize its efficacy. This study aimed to evaluate the remineralization capacity of the fluoride without and with the pre-treatment of the enamel with phosphoric acid and aluminum nitrate and then, the enamel acid-resistance after new acid challenge. Material and Methods: Twenty-four enamel bovine blocks were obtained and selected by means of initial surface microhardness (SMH) measurements. In sequence, WSL were artificially inducted by DE-RE cycling and randomized in two groups according to the enamel pretreatment to be tested (n=12): F (1.23% fluoride gel - APF- 4min) and P-Al-F (37% phosphoric acid- 30s + 0.05M aluminum nitrate 1min + APF- 4min). After then, a new acid challenge was equally performed. Additional SMH assessments were performed in each step. The values were processed and the percentage of SH loss (%SHL) was obtained. Data were statically analyzed by two-way ANOVA and Tukey tests (p<0.05). Results: There was no difference between evaluated protocols. For both groups, a significant difference among the steps of study was detected: it was observed a decrease of %SHL after the treatment and increase of %SHL after the new acid challenge. Conclusion: Enamel pretreatment with phosphoric acid associated with aluminum nitrate promoted similar protective effect compared to fluoride itself on the remineralization of artificial WSL, partially recovering the surface hardness. After new challenge, they also offered partial resistance.

Keywords

Dental caries; Dental enamel; Fluoride; Tooth remineralization.

 

Author Biography

Diana Ferreira Gadelha Araújo, Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil. Department of Odontology – Federal University of Rio Grande do Norte – Natal – RN – Brazil.

Departament of Operative Dentistry,Endodontics and Dental Materials, 

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Published

2018-08-01

Issue

Vol. 21 No. 3 (2018): Jul. - Sep. / 2018 - Published Aug 2018

Section

Clinical or Laboratorial Research Manuscript