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



: Hjerppe Jenni, Perea-Lowery Leila, Lassila Lippo VJ, Vallittu Pekka K

Publisher: Japanese Society for Dental Materials and Devices

: 2021

: Dental Materials Journal

: Dental materials journal

: Dent Mater J

: 0287-4547

: 1881-1361

DOI: https://doi.org/10.4012/dmj.2019-389

: https://doi.org/10.4012/dmj.2019-389


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



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