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In vivo bonding mechanism of an experimental dual-cure enamel-dentin bonding system
1Department of Dental Materials, University of Siena, Italy.
Purpose:
To evaluate, in vivo, the formation of hybrid layer, resin tags and adhesive lateral branches, by an experimental dual-curing "one-bottle" enamel-dentin bonding system.
Materials And Methods:
The new dentin adhesive (Excite DSC) was tested in five Class V restorations placed in vital, periodontally compromised teeth. The experimental bonding system was used in combination with a flowable composite. After 1 wk the teeth were extracted and processed for SEM evaluation. All the samples were split-fractured along their long axis. Half of the samples were used to evaluate hybrid layer formation and the other half to examine the morphology of resin tags.
Results:
The experimental adhesive system showed a micromechanical bonding mechanism to conditioned dentin with formation of a hybrid layer, resin tags and adhesive lateral branches. SEM photomicrographs of the decalcified samples showed a high density of resin tags and uniform distribution along the cavity walls.