Table 3.

Gingival health evaluation

Chi-square test	Zirconia crowns	Strip crowns	p-value
Gingival Health (assessed as bleeding on probing)
At 3 months	24 (40.0%)	40 (66.7%)	0.006a
At 6 months	0 (100.0%)	28 (46.7%)	< 0.001a
At 12 moths	0 (100%)	0 (100%)	N/Ac

Friedman test	Mean rank
	Total cases	Zirconia crown	Strip crown
Baseline	3.61	3.80	3.43
At 3 months	2.68	2.59	2.77
At 6 months	2.09	1.80	2.37
At 12 moths	1.61	1.80	1.43
p-value	< 0.001b	< 0.001b	< 0.001b

^aSignificant using Chi-Square Test @ < 0.05 level

^bSignificant using Friedman Test @ < 0.05 level

^cNo statistics are computed because variable is a constant