Table 1 Trueness and precision values of conventional impressions and intraoral scanners with or without O-I buckles

BCDE

BCDEF

ABCDEF

34.00 ± 7.38

37.79 ± 8.31

37.17 ± 7.89

0.700

37.39 ± 10.10

53.16 ± 11.69

72.25 ± 21.23

< 0.001*

36.70 ± 8.03

40.20 ± 7.06

49.74. ± 7.12

0.025*

0.758

0.004*

< 0.001*

8.67 ± 5.88

9.96 ± 6.31

9.42 ± 6.05

0.781

11.66 ± 8.33

12.69 ± 10.70

24.88 ± 17.00

< 0.001*

9.57 ± 6.18

8.43 ± 5.41

8.44 ± 5.57

0.773

0.248

0.064

< 0.001*