FAILURE IN A COMPOSITE RESIN-DENTIN ADHESIVE BOND

Composites are drawing more and more attention as preferred materials for teeth restoration. The success of teeth restoration has been gener ally limited by the Composite Resin-Dentin bond strength. A testing de vice has been developped to allow a satisfactory testing mehod for eva luating bonding strength in tension and shear, which led to reproducib le results. A comparaison between different bond systems has shown no significant difference in the tensile and the shear strength as well a s in the fracture behavior. Moreover, results showed difference betwee n tensile and shear strength, when considering one same bond system. F ailure mode examination turned out to be, either cohesive (composite r upture), or adhesive (interface rupture) or both ( mixed rupture).