Objectives: To determine resin tensile-bond-strength (TBS) of the metal-ceramic-primer Monobond Plus (MBP/IvoclarVivadent) with Multilink Automix (MLAM/Ivoclar Vivadent) and the ceramic-primer Clearfil-Ceramic Primer (CCP/Kuraray) with Panavia F2.0 (PAN/Kuraray) to ceramics (silicate and zirconia ceramic) direct after sample preparation and after thermocycling.
Methods: TBS (N=7/group) of the combination MBP/MLAM and CCP/PAN, respectively, was determined on HF-etched silicate-ceramic emaxCAD (IvoclarVivadent), IPS Empress (IvoclarVivadent), and on air-abraded zirconia ZirCAD (IvoclarVivadent). Samples were aged in water at 37 °C for 24h before thermocylcing. Initial TBS directly after aging and TBS after 5000 cycles between 5 and 55°C in a water bath with a dwell time of 0.5min were measured.
Results: The received results are listed in the following table.
Substrate | Primer/Cement | Thermocycling | TBS [MPa] |
emaxCAD | MBP/MLAM | 0 | 54.4±5.7 (a) |
emaxCAD | MBP/MLAM | 5000 | 62.6±7.4 (a) |
emaxCAD | CCP/PAN | 0 | 11.1±8.5 (c) |
emaxCAD | CCP/PAN | 5000 | 33.5±15.8 (b) |
IPS Empress | MBP/MLAM | 0 | 58.2±12.3 (a') |
IPS Empress | MBP/MLAM | 5000 | 56.3 ± 9.3 (a') |
IPS Empress | CCP/PAN | 0 | 39.4 ± 6.2 (b') |
IPS Empress | CCP/PAN | 5000 | 17.5 ± 12.5 (c') |
ZirCAD | MBP/MLAM | 0 | 42.4 ± 6.6 (a'') |
ZirCAD | MBP/MLAM | 5000 | 40.7 ± 14.0 (a'') |
ZirCAD | CCP/PAN | 0 | 16.1 ± 13.3 (c'') |
ZirCAD | CCP/PAN | 5000 | 35.3 ± 11.6 (a'') |
(Same letters denote significant comparability; ANOVA, Tukey-B, p<0.05)
Conclusion: On all three ceramic surfaces thermocycling did not vary the tensile-bond-strength of the combination of Monobond Plus/Multilink Automix. The TBS remained on a very high level. In the case of Clearfil-Ceramic Primer/Panavia F2.0 on emaxCAD and ZirCAD thermocycling increased TBS by post-curing, and decreased on IPS Empress. However, the TBS of Monobond Plus/Multilink Automix is always higher than for Clearfil-Ceramic Primer/Panavia F2.0 and is also not affected by thermocycling.