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

  • Patricia Akemi Nishitani Shibasaki School of Medicine and Public Health of Bahia (BAHIANA), Salvador-Ba, Brazil.
  • Janaina Emanuela Damasceno School of Medicine and Public Health of Bahia (BAHIANA), Salvador-Ba, Brazil.
  • Mariana Menezes Vaz de Queiroz School of Medicine and Public Health of Bahia (BAHIANA), Salvador-Ba, Brazil.
  • Luana Mendonça Dias Dentistry Course, School of Medicine and Public Health of Bahia (BAHIANA). Salvador-Ba, Brazil.
  • Max José Pimenta Lima Institute of Health Sciences, Federal University of Bahia (UFBA) Salvador-Ba, Brazil.
  • Roberto Paulo Correia de Araújo Institute of Health Sciences, Federal University of Bahia (UFBA) Salvador-Ba, Brazil.
  • Richard Mark Foxton King’s College London, SE1 9RT, London, UK.
  • Andrea Nóbrega Cavalcanti School of Medicine and Public Health of Bahia (BAHIANA), Salvador-Ba, Brazil. | Institute of Health Sciences, Federal University of Bahia (UFBA) Salvador-Ba, Brazil.


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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How to Cite
SHIBASAKI, Patricia Akemi Nishitani et al. Can surface protection prevent the loss of hardness on dentin and composite resin surfaces exposed to erosive challenges?. Journal of Oral Research, [S.l.], v. 9, n. 2, p. 142-149, june 2020. ISSN 0719-2479. Available at: <>. Date accessed: 15 july 2020. doi: