Shear Bond Strength of Colored and Sandblasted Zirconia to Ceramic Veneers Fabricated by the Pressing and Layering Techniques: An In Vitro Study

Table 4

Measures of central dispersion for zirconia-phase transformation (Xm%) in the study groups.

Group	Mean ± SD	95% confidence interval
		Lower bound	Upper bound
CP^a	0.066 ± 0.021	0.013	0.120
CL^a	0.033 ± 0.005	0.019	0.048
SP^b	0.056 ± 0.010	0.030	0.081
SL^c	0.040 ± 0.009	0.018	0.063
AP^d	0.053 ± 0.003	0.043	0.062
AL^e	0.036 ± 0.008	0.015	0.057

AP, control pressed; AL, control layered; CP, colored pressed; CL, colored layered; SP, sandblasted pressed; SL, sandblasted layered; SBS, shear bond strength; MPa, megapascals; SD, standard deviation. Similar superscripted letters indicate statistically significant differences.