Effects of residual ethanol on the rate and degree of conversion of five experimental resins

Milena Cadenaro, Lorenzo Breschi, Frederick Rueggeberg, Michael Suchko, Evan Grodin, Kelli Agee, Roberto Di Lenarda, Franklin Chi Meng Tay, David Henry Pashley

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Objectives: This study examined the extent of ethanol retention in five comonomer blends of experimental methacrylate-based dental adhesives, containing (10, 20, or 30 wt.%) ethanol, after solvent evaporation, as well as observing the effect of residual ethanol and exposure duration on degree of conversion (DC). The null hypothesis that was tested was that residual, unevaporated ethanol has no effect on the rate or extent of DC of polymerized adhesive resins. Methods: A known mass of each mixture was placed in glass wells and evaporated for 60 s. The mass of the mixtures before and after evaporation was measured, allowing calculation of the gravimetric ethanol loss/retention. Results: The concentration of retained ethanol increased significantly with ethanol concentration (p < 0.01): 1.1-1.9 mole/L for 10% ethanol/90% comonomers, 2.2-3.5 mole/L for 20% ethanol, and 2.6-3.7 mole/L for 30% ethanol/70% comonomers. As ethanol is evaporated from solvated comonomer mixtures, the molar concentration of comonomers increases, reducing the vapor pressure of the remaining ethanol. Thus, the fractional loss of ethanol solvent decreases as the comonomer concentration increases. The DC of 10, 20, and 30 wt.% ethanol blends increased with ethanol concentration in four of the five experimental resins (p < 0.05), increasing by 30-45% when 10 or 20 wt.% ethanol was added to neat resins, regardless of exposure duration. Depending on the resin system, inclusion of 30% ethanol lowered DC at 20 s but increased DC after 40-60 s of light exposure. Significance: Since 10 and 20 wt.% ethanol-resin blends increased the DC of solvated resins by 30-45% over neat resins, the test null hypothesis is rejected. Even with prolonged evaporation, 4-9% residual ethanol concentration can remain in 90/10 (wt./wt.) comonomer-ethanol mixtures. This is thought to be because comonomers lower the vapor pressure of ethanol. This amount of residual ethanol facilitates DC but lowers the rate of polymerization.

Original languageEnglish (US)
Pages (from-to)621-628
Number of pages8
JournalDental Materials
Volume25
Issue number5
DOIs
StatePublished - May 1 2009

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Ethanol
Resins
Vapor Pressure
Evaporation
Vapor pressure
Adhesives
Dental Cements
Methacrylates
Polymer blends
Polymerization
Glass

Keywords

  • DC
  • Ethanol
  • Methacrylate resins
  • Vapor pressure

ASJC Scopus subject areas

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

Cite this

Effects of residual ethanol on the rate and degree of conversion of five experimental resins. / Cadenaro, Milena; Breschi, Lorenzo; Rueggeberg, Frederick; Suchko, Michael; Grodin, Evan; Agee, Kelli; Di Lenarda, Roberto; Tay, Franklin Chi Meng; Pashley, David Henry.

In: Dental Materials, Vol. 25, No. 5, 01.05.2009, p. 621-628.

Research output: Contribution to journalArticle

Cadenaro, M, Breschi, L, Rueggeberg, F, Suchko, M, Grodin, E, Agee, K, Di Lenarda, R, Tay, FCM & Pashley, DH 2009, 'Effects of residual ethanol on the rate and degree of conversion of five experimental resins', Dental Materials, vol. 25, no. 5, pp. 621-628. https://doi.org/10.1016/j.dental.2008.11.005
Cadenaro, Milena ; Breschi, Lorenzo ; Rueggeberg, Frederick ; Suchko, Michael ; Grodin, Evan ; Agee, Kelli ; Di Lenarda, Roberto ; Tay, Franklin Chi Meng ; Pashley, David Henry. / Effects of residual ethanol on the rate and degree of conversion of five experimental resins. In: Dental Materials. 2009 ; Vol. 25, No. 5. pp. 621-628.
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abstract = "Objectives: This study examined the extent of ethanol retention in five comonomer blends of experimental methacrylate-based dental adhesives, containing (10, 20, or 30 wt.{\%}) ethanol, after solvent evaporation, as well as observing the effect of residual ethanol and exposure duration on degree of conversion (DC). The null hypothesis that was tested was that residual, unevaporated ethanol has no effect on the rate or extent of DC of polymerized adhesive resins. Methods: A known mass of each mixture was placed in glass wells and evaporated for 60 s. The mass of the mixtures before and after evaporation was measured, allowing calculation of the gravimetric ethanol loss/retention. Results: The concentration of retained ethanol increased significantly with ethanol concentration (p < 0.01): 1.1-1.9 mole/L for 10{\%} ethanol/90{\%} comonomers, 2.2-3.5 mole/L for 20{\%} ethanol, and 2.6-3.7 mole/L for 30{\%} ethanol/70{\%} comonomers. As ethanol is evaporated from solvated comonomer mixtures, the molar concentration of comonomers increases, reducing the vapor pressure of the remaining ethanol. Thus, the fractional loss of ethanol solvent decreases as the comonomer concentration increases. The DC of 10, 20, and 30 wt.{\%} ethanol blends increased with ethanol concentration in four of the five experimental resins (p < 0.05), increasing by 30-45{\%} when 10 or 20 wt.{\%} ethanol was added to neat resins, regardless of exposure duration. Depending on the resin system, inclusion of 30{\%} ethanol lowered DC at 20 s but increased DC after 40-60 s of light exposure. Significance: Since 10 and 20 wt.{\%} ethanol-resin blends increased the DC of solvated resins by 30-45{\%} over neat resins, the test null hypothesis is rejected. Even with prolonged evaporation, 4-9{\%} residual ethanol concentration can remain in 90/10 (wt./wt.) comonomer-ethanol mixtures. This is thought to be because comonomers lower the vapor pressure of ethanol. This amount of residual ethanol facilitates DC but lowers the rate of polymerization.",
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T1 - Effects of residual ethanol on the rate and degree of conversion of five experimental resins

AU - Cadenaro, Milena

AU - Breschi, Lorenzo

AU - Rueggeberg, Frederick

AU - Suchko, Michael

AU - Grodin, Evan

AU - Agee, Kelli

AU - Di Lenarda, Roberto

AU - Tay, Franklin Chi Meng

AU - Pashley, David Henry

PY - 2009/5/1

Y1 - 2009/5/1

N2 - Objectives: This study examined the extent of ethanol retention in five comonomer blends of experimental methacrylate-based dental adhesives, containing (10, 20, or 30 wt.%) ethanol, after solvent evaporation, as well as observing the effect of residual ethanol and exposure duration on degree of conversion (DC). The null hypothesis that was tested was that residual, unevaporated ethanol has no effect on the rate or extent of DC of polymerized adhesive resins. Methods: A known mass of each mixture was placed in glass wells and evaporated for 60 s. The mass of the mixtures before and after evaporation was measured, allowing calculation of the gravimetric ethanol loss/retention. Results: The concentration of retained ethanol increased significantly with ethanol concentration (p < 0.01): 1.1-1.9 mole/L for 10% ethanol/90% comonomers, 2.2-3.5 mole/L for 20% ethanol, and 2.6-3.7 mole/L for 30% ethanol/70% comonomers. As ethanol is evaporated from solvated comonomer mixtures, the molar concentration of comonomers increases, reducing the vapor pressure of the remaining ethanol. Thus, the fractional loss of ethanol solvent decreases as the comonomer concentration increases. The DC of 10, 20, and 30 wt.% ethanol blends increased with ethanol concentration in four of the five experimental resins (p < 0.05), increasing by 30-45% when 10 or 20 wt.% ethanol was added to neat resins, regardless of exposure duration. Depending on the resin system, inclusion of 30% ethanol lowered DC at 20 s but increased DC after 40-60 s of light exposure. Significance: Since 10 and 20 wt.% ethanol-resin blends increased the DC of solvated resins by 30-45% over neat resins, the test null hypothesis is rejected. Even with prolonged evaporation, 4-9% residual ethanol concentration can remain in 90/10 (wt./wt.) comonomer-ethanol mixtures. This is thought to be because comonomers lower the vapor pressure of ethanol. This amount of residual ethanol facilitates DC but lowers the rate of polymerization.

AB - Objectives: This study examined the extent of ethanol retention in five comonomer blends of experimental methacrylate-based dental adhesives, containing (10, 20, or 30 wt.%) ethanol, after solvent evaporation, as well as observing the effect of residual ethanol and exposure duration on degree of conversion (DC). The null hypothesis that was tested was that residual, unevaporated ethanol has no effect on the rate or extent of DC of polymerized adhesive resins. Methods: A known mass of each mixture was placed in glass wells and evaporated for 60 s. The mass of the mixtures before and after evaporation was measured, allowing calculation of the gravimetric ethanol loss/retention. Results: The concentration of retained ethanol increased significantly with ethanol concentration (p < 0.01): 1.1-1.9 mole/L for 10% ethanol/90% comonomers, 2.2-3.5 mole/L for 20% ethanol, and 2.6-3.7 mole/L for 30% ethanol/70% comonomers. As ethanol is evaporated from solvated comonomer mixtures, the molar concentration of comonomers increases, reducing the vapor pressure of the remaining ethanol. Thus, the fractional loss of ethanol solvent decreases as the comonomer concentration increases. The DC of 10, 20, and 30 wt.% ethanol blends increased with ethanol concentration in four of the five experimental resins (p < 0.05), increasing by 30-45% when 10 or 20 wt.% ethanol was added to neat resins, regardless of exposure duration. Depending on the resin system, inclusion of 30% ethanol lowered DC at 20 s but increased DC after 40-60 s of light exposure. Significance: Since 10 and 20 wt.% ethanol-resin blends increased the DC of solvated resins by 30-45% over neat resins, the test null hypothesis is rejected. Even with prolonged evaporation, 4-9% residual ethanol concentration can remain in 90/10 (wt./wt.) comonomer-ethanol mixtures. This is thought to be because comonomers lower the vapor pressure of ethanol. This amount of residual ethanol facilitates DC but lowers the rate of polymerization.

KW - DC

KW - Ethanol

KW - Methacrylate resins

KW - Vapor pressure

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