Effect of adhesive hydrophilicity and curing time on the permeability of resins bonded to water vs. ethanol-saturated acid-etched dentin

Milena Cadenaro, Lorenzo Breschi, Frederick Rueggeberg, Kelli Agee, Roberto Di Lenarda, Marcela Carrilho, Franklin Chi Meng Tay, David Henry Pashley

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Objective: This study examined the ability of five comonomer blends (R1-R5) of methacrylate-based experimental dental adhesives solvated with 10 mass% ethanol, at reducing the permeability of acid-etched dentin. The resins were light-cured for 20, 40 or 60 s. The acid-etched dentin was saturated with water or 100% ethanol. Method: Human unerupted third molars were converted into crown segments by removing the occlusal enamel and roots. The resulting crown segments were attached to plastic plates connected to a fluid-filled system for quantifying fluid flow across smear layer-covered dentin, acid-etched dentin and resin-bonded dentin. The degree of conversion of the resins was measured using Fourier transform infrared spectroscopy. Result: Application of the most hydrophobic comonomer blend (R1) to water-saturated dentin produced the smallest reductions in dentin permeability (31.9, 44.1 and 61.1% after light-curing for 20, 40 or 60 s, respectively). Application of the same blend to ethanol-saturated dentin reduced permeability of 74.1, 78.4 and 81.2%, respectively (p < 0.05). Although more hydrophilic resins produced larger reductions in permeability, the same trend of significantly greater reductions in ethanol-saturated dentin over that of water-saturated dentin remained. This result can be explained by the higher solubility of resins in ethanol vs. water. Significance: The largest reductions in permeability produced by resins were equivalent but not superior, to those produced by smear layers. Resin sealing of dentin remains a technique-sensitive step in bonding etch-and-rinse adhesives to dentin.

Original languageEnglish (US)
Pages (from-to)39-47
Number of pages9
JournalDental Materials
Volume25
Issue number1
DOIs
StatePublished - Jan 1 2009

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Hydrophilicity
Dentin
Hydrophobic and Hydrophilic Interactions
Adhesives
Curing
Permeability
Ethanol
Resins
Acids
Water
Dentin Permeability
Smear Layer
Crowns
Dental Cements
Methacrylates
Enamels
Light
Fourier transform infrared spectroscopy
Flow of fluids
Third Molar

Keywords

  • Curing time
  • Degree of conversion
  • Dentin permeability
  • Ethanol-wet bonding
  • Hydrophilic resins

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

Cite this

Effect of adhesive hydrophilicity and curing time on the permeability of resins bonded to water vs. ethanol-saturated acid-etched dentin. / Cadenaro, Milena; Breschi, Lorenzo; Rueggeberg, Frederick; Agee, Kelli; Di Lenarda, Roberto; Carrilho, Marcela; Tay, Franklin Chi Meng; Pashley, David Henry.

In: Dental Materials, Vol. 25, No. 1, 01.01.2009, p. 39-47.

Research output: Contribution to journalArticle

Cadenaro, Milena ; Breschi, Lorenzo ; Rueggeberg, Frederick ; Agee, Kelli ; Di Lenarda, Roberto ; Carrilho, Marcela ; Tay, Franklin Chi Meng ; Pashley, David Henry. / Effect of adhesive hydrophilicity and curing time on the permeability of resins bonded to water vs. ethanol-saturated acid-etched dentin. In: Dental Materials. 2009 ; Vol. 25, No. 1. pp. 39-47.
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T1 - Effect of adhesive hydrophilicity and curing time on the permeability of resins bonded to water vs. ethanol-saturated acid-etched dentin

AU - Cadenaro, Milena

AU - Breschi, Lorenzo

AU - Rueggeberg, Frederick

AU - Agee, Kelli

AU - Di Lenarda, Roberto

AU - Carrilho, Marcela

AU - Tay, Franklin Chi Meng

AU - Pashley, David Henry

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AB - Objective: This study examined the ability of five comonomer blends (R1-R5) of methacrylate-based experimental dental adhesives solvated with 10 mass% ethanol, at reducing the permeability of acid-etched dentin. The resins were light-cured for 20, 40 or 60 s. The acid-etched dentin was saturated with water or 100% ethanol. Method: Human unerupted third molars were converted into crown segments by removing the occlusal enamel and roots. The resulting crown segments were attached to plastic plates connected to a fluid-filled system for quantifying fluid flow across smear layer-covered dentin, acid-etched dentin and resin-bonded dentin. The degree of conversion of the resins was measured using Fourier transform infrared spectroscopy. Result: Application of the most hydrophobic comonomer blend (R1) to water-saturated dentin produced the smallest reductions in dentin permeability (31.9, 44.1 and 61.1% after light-curing for 20, 40 or 60 s, respectively). Application of the same blend to ethanol-saturated dentin reduced permeability of 74.1, 78.4 and 81.2%, respectively (p < 0.05). Although more hydrophilic resins produced larger reductions in permeability, the same trend of significantly greater reductions in ethanol-saturated dentin over that of water-saturated dentin remained. This result can be explained by the higher solubility of resins in ethanol vs. water. Significance: The largest reductions in permeability produced by resins were equivalent but not superior, to those produced by smear layers. Resin sealing of dentin remains a technique-sensitive step in bonding etch-and-rinse adhesives to dentin.

KW - Curing time

KW - Degree of conversion

KW - Dentin permeability

KW - Ethanol-wet bonding

KW - Hydrophilic resins

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