Riboflavin-ultraviolet-A-induced collagen cross-linking treatments in improving dentin bonding.

Objectives: To evaluate the collagen cross-linkers, riboflavin-ultraviolet-A (RF/UVA) and glutaraldehyde, with regard to their efficacy in cross-linking the dentinal collagen and improving dentin bonding.

Methods: Glutaraldehyde and different RF/UVA protocols (0.1%RF/1-minUV, 0.