Abstract
Objectives: The aim of this study was to compare the curing reaction of five experimental adhesive blends containing different photo-initiating systems. The hypothesis tested was that degree of conversion (DC) of resin blends is affected by resin type, solvent content and photo-initiating system. Methods: The experimental methacrylate resin blends were ranked from hydrophobic (R2) to hydrophilic (R3 and R4) and tested as neat, or solvated with 10% or 20% ethanol, or 10% ethanol and 10% water. Three different photo-initiators were used: IS-1 = 0.25% CQ (camphorquinone) + 1% EDMAB (ethyl 4-dimethylaminobenzoate); IS-2 = 1.25% TPO (diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide); IS-3 = 0.25% CQ + 0.50% EDMAB + 0.50% TPO. DC of resin blends was measured with a differential scanning calorimeter. Data were analyzed with a three-way ANOVA. Results: Neat resin type influenced DC, as R4 showed the highest values compared to R2 and R3 (p < 0.05). Solvent had a significant effect on DC (p < 0.05): dilution of resin blends with 10% or 20% ethanol or 10% ethanol + 10% water increased the DC of all resins, except for R4. Initiators influenced the polymerization since neat resins and mixtures solvated with 10% or 20% ethanol showed their highest DC values when polymerized with IS-1 or IS-3 (p > 0.05), while IS-2 or IS-3 increased the DC values of resins diluted with 10% ethanol and 10% water (p < 0.05). Conclusions: Water-compatible photo-initiators such as TPO should be included in the hydrophilic solvated adhesive formulation to ensure an appropriate DC of the adhesive layer.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 288-294 |
| Number of pages | 7 |
| Journal | Dental Materials |
| Volume | 26 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 2010 |
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Keywords
- Degree of conversion
- Dentin-bonding agents
- Hydrophilicity
- Initiators
- Solvent
ASJC Scopus subject areas
- Materials Science(all)
- Dentistry(all)
- Mechanics of Materials
Cite this
Influence of different initiators on the degree of conversion of experimental adhesive blends in relation to their hydrophilicity and solvent content. / Cadenaro, Milena; Antoniolli, Francesca; Codan, Barbara; Agee, Kelli; Tay, Franklin R.; Dorigo, Elettra De Stefano; Pashley, David H.; Breschi, Lorenzo.
In: Dental Materials, Vol. 26, No. 4, 01.04.2010, p. 288-294.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of different initiators on the degree of conversion of experimental adhesive blends in relation to their hydrophilicity and solvent content
AU - Cadenaro, Milena
AU - Antoniolli, Francesca
AU - Codan, Barbara
AU - Agee, Kelli
AU - Tay, Franklin R.
AU - Dorigo, Elettra De Stefano
AU - Pashley, David H.
AU - Breschi, Lorenzo
PY - 2010/4/1
Y1 - 2010/4/1
N2 - Objectives: The aim of this study was to compare the curing reaction of five experimental adhesive blends containing different photo-initiating systems. The hypothesis tested was that degree of conversion (DC) of resin blends is affected by resin type, solvent content and photo-initiating system. Methods: The experimental methacrylate resin blends were ranked from hydrophobic (R2) to hydrophilic (R3 and R4) and tested as neat, or solvated with 10% or 20% ethanol, or 10% ethanol and 10% water. Three different photo-initiators were used: IS-1 = 0.25% CQ (camphorquinone) + 1% EDMAB (ethyl 4-dimethylaminobenzoate); IS-2 = 1.25% TPO (diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide); IS-3 = 0.25% CQ + 0.50% EDMAB + 0.50% TPO. DC of resin blends was measured with a differential scanning calorimeter. Data were analyzed with a three-way ANOVA. Results: Neat resin type influenced DC, as R4 showed the highest values compared to R2 and R3 (p < 0.05). Solvent had a significant effect on DC (p < 0.05): dilution of resin blends with 10% or 20% ethanol or 10% ethanol + 10% water increased the DC of all resins, except for R4. Initiators influenced the polymerization since neat resins and mixtures solvated with 10% or 20% ethanol showed their highest DC values when polymerized with IS-1 or IS-3 (p > 0.05), while IS-2 or IS-3 increased the DC values of resins diluted with 10% ethanol and 10% water (p < 0.05). Conclusions: Water-compatible photo-initiators such as TPO should be included in the hydrophilic solvated adhesive formulation to ensure an appropriate DC of the adhesive layer.
AB - Objectives: The aim of this study was to compare the curing reaction of five experimental adhesive blends containing different photo-initiating systems. The hypothesis tested was that degree of conversion (DC) of resin blends is affected by resin type, solvent content and photo-initiating system. Methods: The experimental methacrylate resin blends were ranked from hydrophobic (R2) to hydrophilic (R3 and R4) and tested as neat, or solvated with 10% or 20% ethanol, or 10% ethanol and 10% water. Three different photo-initiators were used: IS-1 = 0.25% CQ (camphorquinone) + 1% EDMAB (ethyl 4-dimethylaminobenzoate); IS-2 = 1.25% TPO (diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide); IS-3 = 0.25% CQ + 0.50% EDMAB + 0.50% TPO. DC of resin blends was measured with a differential scanning calorimeter. Data were analyzed with a three-way ANOVA. Results: Neat resin type influenced DC, as R4 showed the highest values compared to R2 and R3 (p < 0.05). Solvent had a significant effect on DC (p < 0.05): dilution of resin blends with 10% or 20% ethanol or 10% ethanol + 10% water increased the DC of all resins, except for R4. Initiators influenced the polymerization since neat resins and mixtures solvated with 10% or 20% ethanol showed their highest DC values when polymerized with IS-1 or IS-3 (p > 0.05), while IS-2 or IS-3 increased the DC values of resins diluted with 10% ethanol and 10% water (p < 0.05). Conclusions: Water-compatible photo-initiators such as TPO should be included in the hydrophilic solvated adhesive formulation to ensure an appropriate DC of the adhesive layer.
KW - Degree of conversion
KW - Dentin-bonding agents
KW - Hydrophilicity
KW - Initiators
KW - Solvent
UR - http://www.scopus.com/inward/record.url?scp=76849117498&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=76849117498&partnerID=8YFLogxK
U2 - 10.1016/j.dental.2009.11.078
DO - 10.1016/j.dental.2009.11.078
M3 - Article
C2 - 20018363
AN - SCOPUS:76849117498
VL - 26
SP - 288
EP - 294
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 4
ER -