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Bonding of restorative and veneering composite resin to some polymeric composites
T T Kallio1, T M Lastumäki, P K Vallittu
1Department of Prosthetic Dentistry, Institute of Dentistry, University of Turku, Lemminäisenkatu 2, 20520 Turku, Finland.
Objectives:
The aim of the study was to determine bond strengths between different fiber-reinforced composites (FRC) and visible light-curing composites (VCR).
Methods:
A total of 180 specimens comprising eight types of FRC substrates and four types of VCR substrates were fabricated and divided in 36 different groups. Substrate surfaces were ground with 1200-grit silicon carbide paper before adding a repair composite (RC). The shear bond strength was determined for specimens without the use of an intermediate resin (IMR), for specimens with the IMR and for specimens with the IMR and thermocycling. Surface roughness of the substrate was measured with a profilometer before adding RC on the substrate.
Results:
The univariate analyses of variance (ANOVA) revealed significant differences (p<0.001) related to the type of the substrate, the IMR and the thermocycling. The highest shear bond strength for FRC substrates was achieved with StickNet/Z-100 combination and for VCR substrates with Sinfony/Sinfony combination. Surface roughness (R(a)) varied from 0.10 microm of Targis VCR to 0.50 microm for Vectris Pontic FRC.
Significance:
Surface roughness seemed not to influence shear bond strengths of RC to FRC and VCR substrates. High shear bond strengths were related to specific materials and IMRs used. In some cases materials performed better without the use of the accessory IMR.