Objectives: The aim of this study was to compare the bond strength of six different composite resin luting cements to an individually formed fiber reinforced composite (FRC) post with semi-IPN (interpenetrating polymer network) polymer matrix.
Methods: The FRC post material (light-curing semi-IPN resin-impregnated continuous unidirectional E-glass FRC) (everStick Post) was embedded horizontally as a flat surface on a mold of acrylic resin with the fibers placed along the surface of the mold. After light-curing for 40 seconds the surface of the FRC was treated with light curing resin (Stick Resin) of bis-GMA-TEGDMA for 5 minutes for activating the semi-IPN polymer matrix of the FRC post material. Composite resin luting cement stubs (diameter= 3.6mm, height= 3 mm) of six different brands (n= 7/group) were applied on the surface of the FRC and light-cured for 40 seconds. Shear bond strengths (MPa) of luting cement stubs were measured using a universal testing machine with a cross-head speed of 1.0 mm/min. In the test set up, the direction of the fibers was the same as the direction of the load.
Results: Shear bond strength in MPa (SD):
|
ParaPostC |
HI-X |
Variolink |
Bisfil 2B |
Compolute |
PanaviaF |
|
19.0 (6.2) |
18.6 (1.7) |
22.0 (7.0) |
18.5 (12.0) |
23.1 (8.9) |
24.3 (3.5) |
The differences in shear bond strength between the six cements were not statistically significant (ANOVA, p= 0.54).
Conclusion: The tested composite resin luting cements adhered well to the post material. No statistically significant differences in bond strength between the cements were found.