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The Journal of Adhesive Dentistry
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J Adhes Dent 16 (2014), No. 5     21. Nov. 2014
J Adhes Dent 16 (2014), No. 5  (21.11.2014)

Page 459-464, doi:10.3290/j.jad.a32809, PubMed:25264548


Long-term Storage Affects Adhesion Between Titanium and Zirconia Using Resin Cements
Cvikl, Barbara / Dragic, Mirza / Franz, Alexander / Raabe, Modesto / Gruber, Reinhard / Moritz, Andreas
Purpose: To determine the impact of long-term storage on adhesion between titanium and zirconia using resin cements.
Materials and Methods: Titanium grade 4 blocks were adhesively fixed onto zirconia disks with four resin cements: Panavia F 2.0 (Kuraray Europe), GC G-Cem (GC Europe), RelyX Unicem (3M ESPE), and SmartCem 2 (Dentsply DeguDent). Shear bond strength was determined after storage in a water bath for 24 h, 16, 90, and 150 days at 37°C, and after 6000 cycles between 5°C and 55°C. Fracture behavior was evaluated using scanning electron microscopy.
Results: After storage for at least 90 days and after thermocycling, GC G-Cem (16.9 MPa and 15.1 MPa, respectively) and RelyX Unicem (10.8 MPa and 15.7 MPa, respectively) achieved higher shear bond strength compared to SmartCem 2 (7.1 MPa and 4.0 MPa, respectively) and Panavia F2 (4.1 MPa and 7.4 MPa, respectively). At day 150, GC G-Cem and RelyX Unicem caused exclusively mixed fractures. SmartCem 2 and Panavia F2 showed adhesive fractures in one-third of the cases; all other fractures were of mixed type. After 24 h (GC G-Cem: 26.0, RelyX Unicem: 20.5 MPa, SmartCem 2: 16.1 MPa, Panavia F2: 23.6 MPa) and 16 days (GC G-Cem: 12.8, RelyX Unicem: 14.2 MPa, SmartCem 2: 9.8 MPa, Panavia F2: 14.7 MPa) of storage, shear bond strength was similar among the four cements.
Conclusion: Long-term storage and thermocycling differentially affects the bonding of resin cement between titanium and zirconia.

Keywords: titanium, zirconia, long-term storage, thermocycling, shear bond strength