Table 3.

Changes in lightness of the restorative materials and the ceramic across 5 years.

Time
Material	L*(0 day)	L*(1 year)	L*(2 years)	L*(3 years)	L*(4 years)	L*(5 years)
Ceramic	72.72 ± 1.35aA	72.05 ± 1.60beA	71.71 ± 1.64ceA	71.61 ± 1.60bcdA	72.19 ± 1.74eA	72.07 ± 1.88abeA
A1E	77.66 ± 2.05aB	72.03 ± 0.96bA	71.75 ± 0.90bA	71.58 ± 0.84bA	71.85 ± 1.04bA	71.41 ± 0.88bA
A2E	75.85 ± 1.50aB	71.03 ± 0.95bA	70.59 ± 1.05bA	71.28 ± 2.35bA	70.56 ± 1.54bA	70.51 ± 1.52bA
A3E	74.10 ± 1.49aA	69.21 ± 1.23cA	68.30 ± 1.76bcB	67.99 ± 3.56bcA	67.70 ± 3.62bcA	65.45 ± 5.80bB
A1B	76.79 ± 3.9aB	69.8 ± 1.69cA	67.50 ± 2.78 dB	64.58 ± 3.80eB	61.86 ± 4.50fB	63.03 ± 7.96befB
A2B	76.48 ± 3.21aB	70.66 ± 3.77cA	70.34 ± 2.62bcA	69.45 ± 3.98bcA	67.44 ± 6.48dA	65.55 ± 7.20 dB
A3B	75.74 ± 3.06aB	67.94 ± 2.32cB	67.81 ± 2.02bcB	66.85 ± 3.15bcB	64.40 ± 3.70 dB	64.40 ± 4.82bcdB
A1D	78.50 ± 2.53aB	70.80 ± 4.89cA	70.79 ± 4.34bcA	69.41 ± 6.23bcA	67.10 ± 5.72dA	64.86 ± 7.38 dB
A2D	78.65 ± 1.86aB	74.49 ± 1.53cA	73.83 ± 2.41bceA	73.28 ± 1.45bcA	71.35 ± 2.66deA	70.19 ± 3.79dA
A3D	74.73 ± 2.71aA	66.91 ± 3.45cB	64.41 ± 4.17 dB	63.13 ± 6.21bdB	58.95 ± 8.26eB	56.86 ± 9.67eB
A1F	75.40 ± 3.50aB	69.56 ± 2.59cA	68.65 ± 2.80bcB	68.98 ± 2.01bcA	68.45 ± 1.98bcA	64.86 ± 3.31 dB
A2F	71.73 ± 1.27aA	66.68 ± 1.75bcB	66.03 ± 1.93bcB	65.06 ± 2.56bcB	66.61 ± 2.46cB	63.95 ± 2.61bB
A3F	71.79 ± 1.77aA	66.64 ± 0.47bcB	66.21 ± 1.05bcB	66.38 ± 0.99bcB	67.29 ± 1.76cA	64.68 ± 2.01bB
A1BF	75.90 ± 0.81aB	73.64 ± 1.87bA	73.61 ± 2.19bA	74.10 ± 3.17abA	73.81 ± 3.05abA	72.76 ± 3.98abA
A2BF	74.35 ± 1.93aA	70.88 ± 3.28bcA	70.51 ± 2.38bcA	70.13 ± 5.29bA	71.50 ± 3.59abA	67.36 ± 5.26cA
A3BF	71.29 ± 1.69aA	67.41 ± 3.77cB	67.31 ± 3.88bcB	66.71 ± 5.35bcB	65.78 ± 6.76bcdB	63.58 ± 8.97 dB
GI	70.16 ± 4.09aA	68.64 ± 3.38aB	63.31 ± 3.71cB	60.35 ± 9.78 dB	56.88 ± 13.21bB	57.43 ± 14.26bB

Lower case letters indicate significant difference within the row (p < 0.05).

Upper case letters indicate significant difference within the column (p < 0.05).