Evaluation of commercial fluoride solutions on bovine enamel demineralization, using pH-cycling model

Avaliação de soluções fluoretadas comerciais na redução da perda mineral em esmalte bovino, utilizando modelo de ciclagem de pH

Maira de Souza Carvalho; Juliana Maria Souza de Oliveira; Juliana Vianna Pereira; Maria Augusta Bessa Rebelo

Faculty of Dentistry, Federal University of Amazonas, Manaus, AM, Brazil

Correspondence

ABSTRACT

PURPOSE: The aim of this in vitro study was to evaluate the fluoride concentration in mouthrinses and their capacity to intervene with the caries process.
METHODS: The analysis of the fluoride concentration in the solutions was carried with ion specific electrode connected to an ion analyzer. Bovine incisors enamel blocks with previously known superficial microhardness were submitted to a pH cycling model and treated with fluoridated solutions, and later reanalyzed for microhardness and fluoride incorporation.
RESULTS: The fluoride concentration (ppm) found in the solutions SANiFill- Sanikids^®, Colgate Plax Fresh Mint^®, Oral B^®, Sorriso Fresh^® and Cepacol^® (not fluoridated) were, respectively: 242.91±21.89; 248.42±3.55; 248.29±11.31; 257.61±17.57 and 35.37±10.64. The lowest loss of superficial microhardness was observed with the use Sorriso Fresh^® (29.66%± 8.84), followed by Plax Fresh mint^® (32.99%±14.09) and Oral B^® (43.00%±18.34).
CONCLUSION: The data suggest that fluoride solutions, in proper concentrations, are capable of intervening on the phenomena of demineralization and remineralization, promoting fluoride incorporation and, consequently, decreasing the loss of microhardness on dental enamel.

Key words: Microhardness; fluoride; pH-cycling

RESUMO

OBJETIVO: O objetivo deste estudo in vitro foi analisar a concentração de flúor em diferentes soluções fluoretadas para bochechos e sua capacidade de interferir no processo de cárie. ]]> METODOLOGIA: A análise da concentração de flúor nas soluções para bochecho foi realizada com eletrodo específico para íon flúor acoplado a um analisador de íons Orion. Blocos de esmalte de dentes incisivos bovinos com a microdureza superficial conhecida foram submetidos à ciclagem de pH e uso de soluções fluoretadas, sendo, posteriormente, avaliados por uma nova análise de microdureza e também pela incorporação de flúor.
RESULTADOS: As concentrações de flúor (ppm) encontradas nas soluções SANiFill^®, Colgate^® Plax^®, Oral B^®, Sorriso^® e Cepacol^® (não fluoretada) foram, respectivamente: 245,94; 247,61; 251,50; 258,01 e 38,44. A menor perda de porcentagem de dureza superficial foi observada com o uso da solução fluoretada Sorriso^® (29,7%±14,4), seguida por Colgate^® Plax^® (33%±14,1) e Oral B^® (43%±18,3). Todas as soluções fluoretadas analisadas mostraram capacidade de incorporar flúor no esmalte dental.
CONCLUSÃO: Os dados sugerem que as soluções fluoretadas foram capazes de interferir nos fenômenos de desmineralização e remineralização, promover incorporação de flúor e, conseqüentemente, diminuir a perda de dureza no esmalte dental.

Palavras-chave: Microdureza; flúor; ciclagem de pH

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The authors would like to thank CNPq for the Research Grant PIBIC (PIB-S-044/2006) from the Federal University of Amazonas, Brazil.

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Correspondence:
Maria Augusta Bessa Rebelo
Rua Rio Itannauá, 194/504; Nossa Sra das Graças
Manaus, AM - Brazil 69053-040
E mail: augusta@ufam.edu.br

Received: November 24, 2008
Accepted: March 31, 2010

Conflict of Interest Statement: The authors state that there are no financial and personal conflicts of interest that could have inappropriately influenced their work.