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Influence of flavonoids on long-term bonding stability on caries-affected dentin

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2020
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Dávila-Sánchez, Andrés
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Influence of flavonoids on long-term bonding stability on caries-affected dentin
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Author
  • Dávila-Sánchez, Andrés;
  • Gutiérrez Reyes, Mario;
  • Bermúdez, Jorge Pailover;
  • Méndez Bauer, María Lujan;
  • Hilgemberg, Bruna;
  • Sauro, Salvatore;
  • Loguercio, Alessandro D.;
  • Galvao Arrais, César Augusto;
Abstract
Objectives. To evaluate the effect of experimental dentin pre-treatment solutions formulated with different flavonoids on microtensile bond strength (mu TBS), nanohardness (NH) and ultra-morphological characteristics of artificial caries-affected dentin (CAD) bonded using a universal bonding system. Methods. A microbiological method was used to create an artificial CAD in 91 human molars. Five experimental pre-treatment solutions were created using the following flavonoids: quercetin (QUE); hesperidin (HES); rutin (RUT); naringin (NAR), or proanthocyanidin (PRO). A placebo solution (PLA) with no flavonoids added was also evaluated. The flavonoids or placebo solutions were applied to the CAD prior to the application and photoactivation of a universal adhesive (Scotchbond Universal, 3M Oral Care). A control group (CON), in which only the bonding agent was applied without any flavonoid solution, was also evaluated. A 3-mm-thick block of resin composite (Opallis, FGM) was built up on the flat bonded CAD surfaces and was light-cured following the manufacturer's instructions. Specimens were sectioned to obtain resin-dentin slices and sticks (cross-sectional area of 0.8 mm(2)). The mu TBS, NH, and confocal ultramorphology analysis of resin-dentin interface was evaluated at 24 h and after thermo-cycling aging (25,000 cycles). The results were analyzed using 2-way ANOVA followed by Bonferroni's post hoc test (pre-set alpha = 0.05). Results. The specimens from groups QUE, NAR, and RUT presented greater mu TBS values than those from CON group (p<0.05). Specimens from some of these experimental groups presented greater nanomechanical properties (p<0.05), and no morphological degradation at the resin-dentin interface after aging. Significance. The use of exogenous cross-linkers as dentin pre-treatment before bonding procedures may represent a suitable strategy to improve the longevity of universal adhesive systems applied to caries-affected dentin.
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Programa de Consolidacion de Indicadores: Fomento Plan Estatal[CEU-UCH 2018-2020]
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URI: https://repositorio.uchile.cl/handle/2250/177536
DOI: 10.1016/j.dental.2020.05.007
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Dental Materials Volumen: 36 Número: 9 Páginas: 1151-1160 Sep 2020
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