Table 4.

The cytocompatibility scores of the TiO₂ and N-TiO₂ thin films.

Criterion	No. 1	No. 2	No. 3	No. 4	No. 5	No. 6	No. 7	No. 8	Control (NiTi)
Direct cytotoxicity	0	1.8 ± 0.41	0.3 ± 0.52	1.5 ± 0.55	0.2 ± 0.41	0.3 ± 0.52	1 ± 0	1.2 ± 0.41	0.3 ± 0.52
Adhesion and spreading of cells	0	1.6 ± 0.55	0.8 ± 0.50	2 ± 0	1 ± 0	0.3 ± 0.50	2 ± 0	1.3 ± 0.50	0
Viability of cells	1.3 ± 0.82	0.5 ± 0.55	0.8 + 0.45	1.4 ± 0.55	2 ± 0	1.2 ± 0.45	0.8 ± 0.45	0.6 ± 0.89	0.7 ± 1.0
NO production	0.3 ± 0.52	0 ± 0	1 ± 0	1.3 ± 0.52	0 ± 0	0 ± 0	2 ± 0	2 ± 0	0.5 ± 0.55
ICI (ICImax = 8)	1.6	3.9	2.9	6.2	3.2	1.8	5.8	5.1	1.5