Surface Hardness of Resin Cement Polymerized under Different Ceramic Materials

Table 1

The mean (KHN) ± standard deviation of surface hardness of two resin cements when polymerized under different ceramic a.

Ceramic/thickness (mm)	KHN (mean ± SD)
	Variolink Veneer	NX3
Control	21.64±3.7^1	30.28±1.8^2
e.max HT/0.5	19.39±3.8^1Aa	30.16±1.8^2Ne
e.max HT/1.0	18.39±3.3^1ABb	29.80±2.2^2Nf
e.max HT/1.5	17.16±2.9^1ABc	27.79±1.9^2Nh
e.max HT/2.0	15.38±2.1^1Bd∗	24.83±3.3^2Ok∗
e.max LT/0.5	19.42±3.2^1Ca	28.30±2.3^2Pe
e.max LT/1.0	18.40±3.1^1CDb	27.29±2.3^2POfg
e.max LT/1.5	16.45±3.2^1CDc	26.90±2.1^2QRhi∗
e.max LT/2.0	15.30±3.2^1Dd∗	22.99±2.1^2Rk∗
e.max MO/0.5	19.43±3.2^1Ea	28.46±1.5^2Se
e.max MO/1.0	17.97±3.2^1EFb	27.45±2.2^2Sfg
e.max MO/1.5	16.47±3.3^1EFc	26.31±1.8^2Shi∗
e.max MO/2.0	14.81±2.8^1Fd∗	23.81±2.4^2Tkm∗
e.max HO/0.5	19.81±3.9^1Ga	29.48±2.6^2Ue
e.max HO/1.0	18.15±3.4^1GHb	27.16±2.4^2UVfg∗
e.max HO/1.5	16.34±2.8^1HJc∗	25.51±2.3^2Vhi∗
e.max HO/2.0	13.01±2.1^1Jd∗	20.08±2.6^2Wkm∗
Cercon/0.5	17.66±3.3^1Ka	28.80±2.3^2Xe
Cercon/1.0	16.73±2.8^1KLb∗	27.11±2.5^2XYg∗
Cercon/1.5	14.47±2.4^1LMc∗	24.70±2.7^2Yj∗
Cercon/2.0	13.15±3.1^1Md∗	21.82±2.4^2Zm∗

Different numbers in the same row indicate significant difference (𝑃<0.05) between 2 resin cements. Different uppercase letters in the same column indicate significant difference (𝑃<0.05) among ceramic thicknesses in each ceramic type.
Different lowercase letters in the same column indicate significant difference (𝑃<0.05) among ceramic types in each ceramic thickness.
*Indicates significant difference (𝑃<0.05) from control group.