Table 2 Comparison of height and angle slot errors between cast and SLM brackets, measured at no-support, support, and overall average surfaces.

From: Slot fidelity and ligation-dependent tribology in personalized brackets made by casting versus selective laser melting: an in vitro study

 

Height error (µm)

Angle error (°)

Group

No support

With support

Overall

P1

rrb (95% CI)

No support

With support

Overall

P1

rrb​ (95% CI)

Cast

31.86 (14.44–77.85)

44.64 ± 37.81

72.77 (44.51–126.94)

97.15 ± 74.86

59.01 (44.01–87.02)

70.90 ± 42.11

0.001

0.60 (0.30–0.85)

6.39 (1.95–9.57)

9.03 ± 11.41

6.75 (3.16–11.39)

10.08 ± 10.37

6.38 (3.02–13.41)

9.56 ± 8.88

0.307

0.20 (− 0.17–0.58)

SLM

39.30 (14.44–60.68)

45.08 ± 37.37

73.39 (58.82–105.93)

79.30 ± 41.39

64.71 (39.42–82.22)

62.19 ± 29.93

 < 0.001

0.68 (0.40–0.89)

5.69 (2.47–16.43)

12.44 ± 14.45

23.26 (13.32–30.75)

23.07 ± 13.02

14.86 (9.11–25.59)

17.76 ± 11.29

 < 0.001

0.70 (0.41–0.92)

P2

Cliff’s δ (95% CI)

0.969

 − 0.01 (− 0.28–0.27)

0.826

0.03 (− 0.25–0.30)

0.681

0.06 (− 0.21–0.33)

 

0.454

 − 0.10 (− 0.38–0.17)

 < 0.001

 − 0.62 (− 0.82– − 0.40)

 < 0.001

 − 0.50 (− 0.72– − 0.26)

 
  1. CI, confidence interval; rrb, rank-biserial correlation; SLM, selective laser melting; Values are presented as median (interquartile range), and mean ± standard deviation; P1 Significance level for comparison between no-support and support surfaces within the same fabrication method (Wilcoxon signed-rank test); P2 Significance level for comparison between cast and SLM groups for the same parameter (Mann–Whitney U test).
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