Degree of conversion of resin blends in relation to ethanol content and hydrophilicity

Milena Cadenaro, Lorenzo Breschi, Francesca Antoniolli, Chiara O. Navarra, Annalisa Mazzoni, Franklin R. Tay, Roberto Di Lenarda, David H. Pashley

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Objectives: To evaluate the degree of conversion of five experimental adhesive systems in relation to their hydrophilicity. The resin blends ranged from hydrophobic to hydrophilic and were tested as neat bonding agents, or solvated with increasing percentages of ethanol. The hypothesis tested was that extent of polymerization of resin blends is affected by resin hydrophilicity, solvent concentrations or time of polymerization. Methods: Five light-curing versions of neat experimental resin blends were submitted to investigation: (1) 70% E-BisADM, 28.75% TEGDMA; (2) 70% BisGMA, 28.7% TEGDMA; (3) 70% BisGMA, 28.7% HEMA; (4) 40% BisGMA, 30% TCDM, and 28.75% TEGDMA; (5) 40% BisGMA, 30% BisMP, and 28.75% HEMA. All blends included 1% EDMAB and 0.25% CQ. Ethanol in different weight percentages (A: 0%, B: 30%, C: 50%, D: 70% and E: 90%) was added to these resin blends simulating different formulation of adhesives. A differential scanning calorimeter was used to measure the degree of conversion of resin blends as a function of resin hydrophilicity, solvent concentration and time of curing. Data were analyzed with three-way ANOVA and Tukey's post hoc test. Results: Exotherms showed that degree of conversion was influenced by the hydrophilicity of the blends resin (p < .05), percentage of ethanol dilution (p < .05) and time of curing (p < .05). 30% ethanol dilution increased degree of conversion compared to neat compounds irrespective to resin type and curing time, showing the highest degree of conversion values of the study design. Significance: This study supports the hypothesis that high ethanol percentages (>50 mass%) may compromise extent of polymerization kinetics of dental adhesives.

Original languageEnglish (US)
Pages (from-to)1194-1200
Number of pages7
JournalDental Materials
Volume24
Issue number9
DOIs
StatePublished - Sep 1 2008

Fingerprint

Hydrophilicity
Hydrophobic and Hydrophilic Interactions
Ethanol
Resins
Polymerization
Adhesives
Polymer blends
Dental Cements
Curing
Analysis of Variance
Light
Weights and Measures
Analysis of variance (ANOVA)
Calorimeters
triethylene glycol dimethacrylate
Scanning
Kinetics
hydroxyethyl methacrylate

Keywords

  • DSC
  • Degree of conversion
  • Dental bonding agents
  • Ethanol
  • Hydrophilicity

ASJC Scopus subject areas

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

Cite this

Cadenaro, M., Breschi, L., Antoniolli, F., Navarra, C. O., Mazzoni, A., Tay, F. R., ... Pashley, D. H. (2008). Degree of conversion of resin blends in relation to ethanol content and hydrophilicity. Dental Materials, 24(9), 1194-1200. https://doi.org/10.1016/j.dental.2008.01.012

Degree of conversion of resin blends in relation to ethanol content and hydrophilicity. / Cadenaro, Milena; Breschi, Lorenzo; Antoniolli, Francesca; Navarra, Chiara O.; Mazzoni, Annalisa; Tay, Franklin R.; Di Lenarda, Roberto; Pashley, David H.

In: Dental Materials, Vol. 24, No. 9, 01.09.2008, p. 1194-1200.

Research output: Contribution to journalArticle

Cadenaro, M, Breschi, L, Antoniolli, F, Navarra, CO, Mazzoni, A, Tay, FR, Di Lenarda, R & Pashley, DH 2008, 'Degree of conversion of resin blends in relation to ethanol content and hydrophilicity', Dental Materials, vol. 24, no. 9, pp. 1194-1200. https://doi.org/10.1016/j.dental.2008.01.012
Cadenaro, Milena ; Breschi, Lorenzo ; Antoniolli, Francesca ; Navarra, Chiara O. ; Mazzoni, Annalisa ; Tay, Franklin R. ; Di Lenarda, Roberto ; Pashley, David H. / Degree of conversion of resin blends in relation to ethanol content and hydrophilicity. In: Dental Materials. 2008 ; Vol. 24, No. 9. pp. 1194-1200.
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abstract = "Objectives: To evaluate the degree of conversion of five experimental adhesive systems in relation to their hydrophilicity. The resin blends ranged from hydrophobic to hydrophilic and were tested as neat bonding agents, or solvated with increasing percentages of ethanol. The hypothesis tested was that extent of polymerization of resin blends is affected by resin hydrophilicity, solvent concentrations or time of polymerization. Methods: Five light-curing versions of neat experimental resin blends were submitted to investigation: (1) 70{\%} E-BisADM, 28.75{\%} TEGDMA; (2) 70{\%} BisGMA, 28.7{\%} TEGDMA; (3) 70{\%} BisGMA, 28.7{\%} HEMA; (4) 40{\%} BisGMA, 30{\%} TCDM, and 28.75{\%} TEGDMA; (5) 40{\%} BisGMA, 30{\%} BisMP, and 28.75{\%} HEMA. All blends included 1{\%} EDMAB and 0.25{\%} CQ. Ethanol in different weight percentages (A: 0{\%}, B: 30{\%}, C: 50{\%}, D: 70{\%} and E: 90{\%}) was added to these resin blends simulating different formulation of adhesives. A differential scanning calorimeter was used to measure the degree of conversion of resin blends as a function of resin hydrophilicity, solvent concentration and time of curing. Data were analyzed with three-way ANOVA and Tukey's post hoc test. Results: Exotherms showed that degree of conversion was influenced by the hydrophilicity of the blends resin (p < .05), percentage of ethanol dilution (p < .05) and time of curing (p < .05). 30{\%} ethanol dilution increased degree of conversion compared to neat compounds irrespective to resin type and curing time, showing the highest degree of conversion values of the study design. Significance: This study supports the hypothesis that high ethanol percentages (>50 mass{\%}) may compromise extent of polymerization kinetics of dental adhesives.",
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AU - Mazzoni, Annalisa

AU - Tay, Franklin R.

AU - Di Lenarda, Roberto

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