Restor Dent Endod.  2019 Aug;44(3):e28. 10.5395/rde.2019.44.e28.

The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives

Affiliations
  • 1Dental Research Division, School of Dentistry, Paulista University, Sao Paulo, Brazil. lima.adf@gmail.com
  • 2Department of Restorative Dentistry, Ibirapuera University, São Paulo, Brazil.

Abstract


OBJECTIVES
The aim of this study was to evaluate the influence of different concentrations of nanofillers on the chemical and physical properties of ethanol-solvated and non-solvated dental adhesives.
MATERIALS AND METHODS
Eight experimental adhesives were prepared with different nanofiller concentrations (0, 1, 2, and 4 wt%) and 2 solvent concentrations (0% and 10% ethanol). Several properties of the experimental adhesives were evaluated, such as water sorption and solubility (n = 5, 20 seconds light activation), real-time degree of conversion (DC; n = 3, 20 and 40 seconds light activation), and stability of cohesive strength at 6 months (CS; n = 20, 20 seconds light activation) using the microtensile test. A light-emitting diode (Bluephase 20i, Ivoclar Vivadent) with an average light emittance of 1,200 mW/cm2 was used.
RESULTS
The presence of solvent reduced the DC after 20 seconds of curing, but increased the final DC, water sorption, and solubility of the adhesives. Storage in water reduced the strength of the adhesives. The addition of 1 wt% and 2 wt% nanofillers increased the polymerization rate of the adhesives.
CONCLUSIONS
The presence of nanofillers and ethanol improved the final DC, although the DC of the solvated adhesives at 20 seconds was lower than that of the non-solvated adhesives. The presence of ethanol reduced the strength of the adhesives and increased their water sorption and solubility. However, nanofillers did not affect the water sorption and strength of the tested adhesives.

Keyword

Adhesives; Longevity; Polymerization; Solvents; Storage

MeSH Terms

Adhesives
Dental Cements*
Ethanol
Longevity
Polymerization
Polymers
Solubility
Solvents
Water
Adhesives
Dental Cements
Ethanol
Polymers
Solvents
Water
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