Table 1. Wear volumes of materials at each wear cycle (Mean±SD, Unit: mm³).

Group	Wear cycle
	10,000	20,000	30,000	40,000
Group 1	0.033±0.035a	0.085±0.083b	0.144±0.134d	0.192±0.162f
Group 2	0.024±0.037a	0.047±0.061bc	0.069±0.104de	0.091±0.133fg
Group 3	0.011±0.015a	0.030±0.041bc	0.050±0.065de	0.076±0.100fg
Group 4	0.001±0.001a	0.003±0.003c	0.005±0.005e	0.008±0.008g
Group 5	0.001±0.002a	0.004±0.003c	0.005±0.005e	0.008±0.007g
Group 6	0.001±0.001a	0.003±0.003c	0.004±0.004e	0.005±0.005g
Group 7	0.001±0.001a	0.002±0.003c	0.004±0.007e	0.006±0.008g
Group 8	0.001±0.001a	0.003±0.003c	0.005±0.004e	0.007±0.005g
Group 9	0.001±0.001a	0.002±0.002c	0.004±0.004e	0.005±0.005g

Within the same column, Mean±SD with different capital superscript letter are statistically different (p<0.05)