Table 2.

Surface atomic percentages determined by XPS found in the non-TiO₂-coated samples. (GR IV: Titanium grade IV; GR V: Titanium grade V; T: SLA treated; NT: SLA non-treated).

Sample	Gr IV NT	Gr IV T	Gr V NT	Gr V T
%Ti	16.9	21.5	11.4	17.8
%O	46.2	47.0	37.4	44.7
%C	31.6	31.4	43.5	33.5
%Ca	0.2	0.3	0.7	0.1
%Al	-	-	2.4	3.4
%Si	5.0	-	1.0	-
%P	-	-	1.1	-
%N	-	-	1.9	-
%S	-	-	0.5	-
%Na	0.1	-	0.1	-
%F	-	-	-	0.6
O/Ti	2.8	2.2	3.2	2.5
C/TI	1.9	1.5	3.8	1.9