Table 2.

The result of optimal peripheral screw-hole position

angle	Group 1	Group 2	Group 3	Group 4	P
AOC(degrees)	26.94 ± 3.44	27.06 ± 3.51	27.90 ± 3.52	26.28 ± 3.50	0.690
BOC(degrees)	56.78 ± 3.23	56.56 ± 3.31	55.08 ± 3.36	57.01 ± 3.41	0.437
AOB(degrees)	83.72 ± 2.37	83.61 ± 1.24	82.98 ± 2.92	83.28 ± 1.64	0.897