Evaluation of push-out bond strength of different adhesive system applications

Objective: To compare interfacial strength and failure modes of glass-fibre endodontic posts luted with three different adhesive luting agents.
Methods: A total of 30 extracted human maxillary incisors were randomly divided in three groups and restored using glass-fibre posts and the following luting agents: an experimental self-etching primer/resin-cement MSM-107 (EXP), ExciTE® F DSC adhesive/Variolink II (VII), Gradia Core self-etching bond/Gradia Core cement (GC). Five sections of 1.00±0.05 mm thickness were prepared from each specimen, and the post in each section was subjected to a push-out test. Failure modes of root slices after push-out testing were examined with stereomicroscope. The level of significance was set at alpha=0.05.
Results: EXP achieved the highest bond strength. The mean value recorded for GC was significantly lower than EXP (p<0.05) and did not differ from VII (p>0.05). There was also no significant difference between EXP and VII (p>0.05). Bond failure was mainly mixed failure for VII and GC. Adhesive failures between the cement and the post, cohesive failures within the post and the dentin were mostly observed in EXP.
Conclusion: The new experimental resin cement, MSM-107 showed promising results in term of bonding ability and might be used efficiently to restore endodontically treated teeth.