Table 1. Data from physicochemical tests of implant materials

Coating type	Neutral salt spray test	Indentation hardness (GPa)	Surface roughness test (µmRa)	Coating thickness test (µm)
ADLC-coated implant	Negative (no corrosion)	29.15 ± 0.96	0.10 ± 0.01	1.56 ± 0.03
TiN-coated implant	Negative (no corrosion)	32.07 ± 0.84*	0.09 ± 0.01	1.71 ± 0.02*

Indicates a statistically significant difference compared with ADLC-coated implants (^* p<0.05). Both coatings exhibited excellent corrosion resistance. TiN-coated implants showed greater hardness and coating thickness. The surface roughness of the two coatings was comparable.
Values are presented as the mean ± S.D. (n=5).
ADLC, amorphous diamond-like carbon; TiN, titanium nitride.