Table 1 Mean ± standard deviation of microhardness (VHN) and fracture toughness (K_IC) of studied CAD-CAM materials among different erosive media

1342.9 ± 6.9^A

3.98 ± 0.21^A

1252.5 ± 2.5^B

3.64 ± 0.33^A

1299.3 ± 7.2^C

3.72 ± 0.29^A

1283.4 ± 11.7^C

3.76 ± 0.11^A

1248.7 ± 2.9^B

3.81 ± 0.37^A

606.9 ± 2.9^D

1.89 ± 0.23^B

603.9 ± 4.3^D

1.34 ± 0.34^C

588.9 ± 5.9^D

1.62 ± 0.29^B

601.7 ± 2.4^D

1.77 ± 0.31^B

603.2 ± 2.1^D

1.81 ± 0.19^B

181.6 ± 2.7^E

0.76 ± 0.17^D

155.5 ± 4.3^F

0.63 ± 0.21^E,F

175.9 ± 4.6^E,F

0.68 ± 0.19^D,F

164.9 ± 2.9^E,F

0.65 ± 0.18^F

163.1 ± 13.1^E,F

0.64 ± 0.17^F

109.3 ± 2.5^G

1.21 ± 0.09^C,G

103.4 ± 1.6^G

1.03 ± 0.13^G

101.5 ± 1.7^G

1.09 ± 0.11^G

105.4 ± 1.8^G

1.13 ± 0.2^G

99.6 ± 2.9^G

1.01 ± 0.08^G