Effect of potassium hydrogen difluoride in zirconia-to-resin bonding

The objective of this study was to compare potassium hydrogen difluoride (KHF2) etching for zirconia with commonly used surface roughening and chemical bonding methods (silane, MDP-monomer primer) resin-based luting cement zirconia. Zirconia specimens were divided into six groups (n=10) according treatment procedures, without thermocycling (6,000 cycles, 5–55ºC): 1) air-borne particle abrasion alumina+MDP-monomer (ABP), 2) silica-coated trialuminium trioxide+silane (ABPR-S) 3) KHF2 etching+silane (ETC). Surface roughness bond strength (SBS-test) dry thermocycled measured. SBS did not vary statistically between the groups, but decreased strengths all tested (p<0.05). After thermocycling, ABP had significantly lower values compared ABPR-S ETC Etching method provide better capacity previously introduced adopted methods.