IADR Abstract Archives
Evaluation of dual-cure polymerization under thick monolithic zirconia restorations
Objectives: The aim of this study was to investigate the influence of thickness of the monolithic zirconia material on polymerization efficiency of dual-cure resin cements.
Methods: Three ceramic discs (4.0 mm diameter) with thicknesses of 2.0, 2.5 and 3.0 were prepared in the Zirkonzahn CAD/CAM system using monolithic zirconia blanks. Two dual-cure resin cements were used: Panavia F 2.0 and DuoLink Universal. For each resin cement, ten samples were prepared for each thickness using a teflon mold and 60 resin cement samples were obtained. Light activation was performed for 20 seconds, using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).
Results: A statistically significant decrease in VHN were observed with increasing depth and thickness of the monolithic zirconia discs for each resin cement group (p < 0.05). Panavia F 2.0 samples displayed significantly higher decrease in hardness compared to DuoLink Universal samples for 2.0 and 2.5 (p < 0.001). Under 3.0 mm discs Panavia F 2.0 samples did not completely polymerize.
using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).
Conclusions: Dual-cure resin cements can be used for cementation of monolithic zirconia restorations, however under thicker restorations light attenuation may affect the polymerization negatively. Clinicians may consider dual-cure resin cements with higher amount of self-curing capabilities.
.0 samples did not completely polymerize.
using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).
Methods: Three ceramic discs (4.0 mm diameter) with thicknesses of 2.0, 2.5 and 3.0 were prepared in the Zirkonzahn CAD/CAM system using monolithic zirconia blanks. Two dual-cure resin cements were used: Panavia F 2.0 and DuoLink Universal. For each resin cement, ten samples were prepared for each thickness using a teflon mold and 60 resin cement samples were obtained. Light activation was performed for 20 seconds, using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).
Results: A statistically significant decrease in VHN were observed with increasing depth and thickness of the monolithic zirconia discs for each resin cement group (p < 0.05). Panavia F 2.0 samples displayed significantly higher decrease in hardness compared to DuoLink Universal samples for 2.0 and 2.5 (p < 0.001). Under 3.0 mm discs Panavia F 2.0 samples did not completely polymerize.
using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).
Conclusions: Dual-cure resin cements can be used for cementation of monolithic zirconia restorations, however under thicker restorations light attenuation may affect the polymerization negatively. Clinicians may consider dual-cure resin cements with higher amount of self-curing capabilities.
.0 samples did not completely polymerize.
using a light emitting diode (LED) curing device with irradiance of 1200 mW/cm2. Vickers hardness measurements were conducted. The indentations were made in the cross sectional area at four depths, and the mean values were recorded. Results were statistically analyzed with two-way ANOVA and LSD test (p < 0.05).