Bond to Zirconia Ceramic: Evaluation of Different Primers and a Universal Adhesive

Table 3: Mean tensile bond strength (MPa), standard deviation and failure types in the zirconia ceramic groups.

Groups	Bond Strength Means (MPa) and Standard Deviations	Failure Types
Group 2 – Silane + Scotchbond Universal	27.55 ^a (±6.99)	- 13 cohesive in composite resin cone - 2 mixed*
Group 4 – Z Prime Plus	23.71 ^a (±5.65)	- 11 cohesive in composite resin cone - 4 mixed*
Group 1 – Scotchbond Universal	22.64 ^a (±5.67)	- 6 cohesive in composite resin cone - 9 mixed
Group 5 – MZ Primer	13.64 ^b (±5.49)	- 12 mixed* - 2 cohesive in composite resin cone - 1 adhesive
Group 3 – Signum Zirconia Bond	7.54 ^c (±4.75)	- 15 adhesive

Medians followed by different letters in the columns differ significantly according to Tukey’s test at a significance level of 5%. *Mixed failure: adhesive and cohesive in the composite resin cone.