Table 2.

Surface parameters for retrievals (mean ± standard deviation).

Head type	R a (μm)	R q (μm)	R sk
CoCr control	0.012 ± 0.002	0.016 ± 0.004	−0.85 ± 1.09
ZrO2 control	0.013 ± 0.002	0.018 ± 0.003	−0.204 ± 0.114
CoCr transfer	0.380 ± 0.308	0.540 ± 0.512	0.597 ± 1.319
ZrO2 transfer	0.294 ± 0.294	0.363 ± 0.387	1.397 ± 1.365