Journal of Oral Research (Apr 2020)

Can surface protection prevent the loss of hardness on dentin and composite resin surfaces exposed to erosive challenges?

  • Patricia Akemi Nishitani Shibasaki,
  • Janaina Emanuela Damasceno,
  • Mariana Menezes Vaz de Queiroz,
  • Max José Pimenta Lima,
  • Roberto Paulo Correia de Araújo,
  • Richard Mark Foxton,
  • Andrea Nóbrega Cavalcant

DOI
https://doi.org/10.17126/joralres.2020.021
Journal volume & issue
Vol. 9, no. 2
pp. 142 – 149

Abstract

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Objective: This study investigated the effect of endogenous erosion on the microhardness of dentine and a nanofilled composite resin. Procedures for preventing erosion were also studied. Materials and Methods: 90 bovine dentine specimens were divided into three groups in accordance with the method for preventing: negative control, topical application of fluoride and resin-modified glass ionomer varnish. 120 composite resin specimens were distributed into four groups, which also included a resin sealant, among the preventive procedures. Specimens were then randomly divided into three sub-groups according to the exposure to simulate gastric acid solution and subsequent remineralization: negative control, 9 and 18 cycles. Surface analysis was carried out by measuring the Knoop hardness. The data obtained were statistically analyzed using 2-way ANOVA and Tukey test. Result: The mean hardness of dentine and of the composite specimens resin exhibited lower hardness after 18 cycles. However, the resin-modified glass ionomer varnish resulted in greater values compared to the other preventive procedures. Conclusion: A resin-modified glass ionomer varnish seems to be a promising method for minimizing the damage caused by endogenous acid, but its protection can be reduced depending on the intensity of the erosive challenge.

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