Table 1:
MH descriptive statistics of different time intervals between bleaching gel applications Knoop Hardness Number (KHN).
–
G1 (N = 20)
G2 (N = 20)
Mean
T0
T1
T2
T3
T0
T1
T2
T3
293.751
A
268.740
A
265.042
A
273.139
A
284.523
a
243.128
b
205.080
c
238.320
d,b
±80.76
±105.80
±68.96
±110.90
±43.91
±49.44
±56.58
±56.98