. 2020 Jan 27;20(1):83–89. doi: 10.4103/jips.jips_218_19

Table 5.

Comparison of amount of natural enamel wear against polished Yttrium–tetragonal zirconia polycrystals crowns (Group 1) with amount of natural enamel wear against polished lithium disilicate crowns (Group 2)

Groups	Mean (μm)	SD	SE	Student t-test	P, significance
Enamel wear against polished Y-TZP crowns (Group 1)	42.0	6.66	1.72	0.773	0.446, no significant statistical difference
Enamel wear against polished lithium disilicate crowns (Group 2)	40.06	7.03	1.81	0.773	0.446, no significant statistical difference

P>0.05: Not significant, P<0.05: Significant, P<0.001: Highly. Y-TZP: Yttrium–tetragonal zirconia polycrystals, SD: Standard deviation, SE: Standard error