Whitening Effect of Juglans regia Dry Husk Extract on Primary and Permanent Teeth

Table 2

Statistical test for the change in all colour variables (L, A, B, C, and H) in permanent teeth.

Colour variables	Mean rank (pumice group)	Z (pumice group)	value (pumice group)	Mean rank (Juglans regia group)	Z (Juglans regia group)	value (Juglans regia group)
L	5.67	0.663	0.507	6.00	2.090
A	5.00	1.790	0.074	4.33	1.120	0.263
B	5.03	1.173	0.241	4.80	0.357	0.721
C	4.05	0.969	0.333	6.25	0.255	0.799
H	6.67	1.275	0.202	7.31	0.918	0.359