Brazilian Journal of Oral Sciences (Sep 2019)

Can surface protection prevent damage in margins of composite resin restorations after simulated endogenous erosion?

  • Luana Mendonça Dias,
  • Janaina Emanuela Damasceno,
  • Patricia Akemi Nishitani Shibasaki,
  • Max José Pimenta Lima,
  • Roberto Paulo Correia de Araújo,
  • Richard Mark Foxton,
  • Andrea Nóbrega Cavalcanti

DOI
https://doi.org/10.20396/bjos.v18i0.8656601
Journal volume & issue
Vol. 18

Abstract

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Aim: The study investigated the effect of using surface protection agents in the adaptation of external and internal margins of restorations subjected to simulated erosion. Methods: Cavities with margins in dentin were prepared in bovine incisors (n=120). Adhesive restorations were placed using a three-step etch&rinse adhesive system and nanofilled composite resin. The specimens were divided into four groups, according to the surface protection: negative control, topical application of fluoride (TAF), resin sealant and resin-modified glass ionomer varnish (RMGI varnish). Afterwards, they were divided into three sub-groups, according to the exposure to a simulated solution of gastric acid (DES) (5% HCl, pH=2,2) and subsequent remineralization (RE): negative control, 9 and 18 cycles of DES-RE. The evaluation of the tooth-restoration interface was performed on the internal and frontal images with the aid of a stereoscopic microscope (15x), and the percentage of continuous margins without adhesive failures was quantified. Results: In the external margins, only those groups with surface protection using sealants (resin and glass-ionomer) did not exhibit a significant decrease in the percentage of continuous margins after the erosive challenges. After 18 cycles of DES-RE, the use of resin-modified glass ionomer varnish resulted in the highest percentage of continuous margins. Conclusion: It was concluded that physically covering the surfaces with a sealing agent preserved the marginal adaptation of composite resin restorations exposed to endogenous erosive challenges.

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