Table 2: Luting procedures in the zirconia ceramic samples.

Groups Luting procedures
Group 1 – SBU A thin layer of the adhesive was applied, gently air-dried for 5 s and light-cured for 10 s with the light unit LED Radii Cal.
Group 2 - Silane + SBU A layer of the silane RelyX Ceramic Primer was applied and gently air-dried for 5 s. The adhesive SBU was applied as described for group 1.
Group 3 - Signum Zirconia Bond (SZ) A layer of the Signum Zirconia Bond part I was applied and gently air-dried for 5 s. Then, a layer of Signum Zirconia Bond part II was applied and light-cured for 40 s with the light unit LED Radii Cal.
Group 4 - Z-Prime Plus (ZP) A layer of Z-Prime Plus was applied, gently air-dried for 5 s, and light-cured for 40 s with the light unit LED Radii Cal.
Group 5 - MZ Primer (MZ) A layer of MZ Primer was applied, gently air-dried for 5 s, and light-cured for 40 s with the light unit LED Radii Cal.

SBU – Scotchbond Universal.

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