Table 3. Marginal gaps and fracture resistance of the samples.

Parameters/Groups	Marginal gaps (µm)	Fracture resistance (N)
PFM	75.30 ± 10.70 a	3485.89 ± 195.68 a
MZ 0.5 mm	52.05 ± 8.67 b	1421.56 ± 302.91 b
MZ 0.8 mm	51.40 ± 6.89 b	2768.1 ± 923.35 c
MZ 1.0 mm	48.30 ± 10.39 b	3718.1 ± 624.45 a
MZ 1.5 mm	44.50 ± 7.89 b	Over 10000 N*

PFM: Porcelain fused to metal (1.5 mm thickness), MZ: Monolithic zirconia P < .05, different letters indicate statistical significance. ^* not break with 10000 N (the highest force value of the machine) One way ANOVA and Tukey's HDS post hoc tests were used for multiple comparisons.