Tensile peel failure of resin-bonded Ni Cr beams : an experimental study

الملخص EN

Objectives : To measure the tensile peel strength of different types of luting cements and studies their effect on the adhesive bond quality of resin-bonded bridges.

Methods : Six cements were investigated ; two chemically adhesive resin cements (Super-Bond C&B and Panavia 21), one compomer cement (Dyract Cem), two resin-modified glass ionomer cements (Fuji Plus and RelyX Luting), and one conventional glass ionomer cement (Ketac Cem).

The tensile peel strength was investigated by bonding grit-blasted Ni / Cr alloy beams to a block of the same alloy using the different types of luting cements (n = 20 for each cement), leaving half the length of the beam free.

Beams were pulled off the block with a peeling action by applying a tensile load to the free end of the beam and load at which failure occurs was recorded.

All the fractured surfaces of the tested samples were examined under a stereo zoom microscope.

Results : Data were analyzed using one-way analysis of variance (ANOVA), which showed significant differences between the mean tensile peel strength of the cements (P < 0.05).

Tukey's pairwise comparisons showed that the mean tensile peel strength (in Newton) of Super-Bond (7.7) was significantly greater than Panavia 21 (6.1) as well as all other luting cements.

Ketac Cem gave the lowest value of TPS (2.4).

The mode of failure for all the tested cements was cohesive in nature.

Conclusion : Adhesive resin cements have the highest tensile peel strength which may explain their good clinical performance in resin-bonded bridges compared to other luting cements.