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Table 5 Statistically significant comparisons for the aligner thickness measure (P< 0.05*,P< 0.01**,P< 0.001***)

From: MicroCT X-ray comparison of aligner gap and thickness of six brands of aligners: an in-vitro study

Aligner thickness

Tooth

Comparison

Estimate (μm)

SE (μm)

Df

Lower CL (μm)

Upper CL (μm)

Pvalue

Canine

Air Nivol-ALL IN

− 1100.96

19.83

467

− 1157.71

− 144.22

P < 0.001***

Air Nivol-Invisalign

− 179.47

21.03

467

− 1139.66

− 119.29

P < 0.01**

Air Nivol-Nuvola

− 160.04

19.83

467

− 1116.78

− 13.30

P < 0.05*

ALL IN-Arc Angel

48.19

19.83

467

− 18.55

104.93

P < 0.05*

ALL IN–F22

125.33

19.83

467

68.58

182.07

P < 0.001***

Arc Angel-F22

77.14

19.83

467

20.39

133.88

P < 0.01**

F22-Invisalign

− 1103.84

21.03

467

− 1164.02

− 143.65

P < 0.001***

F22-Nuvola

− 184.40

19.83

467

− 1141.15

− 127.66

P < 0.001***

Incisor

Air Nivol-ALL IN

− 159.57

19.83

467

− 1116.31

− 12.82

P < 0.05*

Air Nivol-Invisalign

− 163.75

21.03

467

− 1123.94

− 13.57

P < 0.05*

ALL IN-F22

81.84

19.83

467

25.10

138.59

P < 0.001***

ALL IN-Nuvola

61.30

19.83

467

4.56

118.05

P < 0.05*

Arc Angel-F22

65.56

19.83

467

8.81

122.30

P < 0.05*

F22-Invisalign

− 186.03

21.03

467

− 1146.22

− 125.84

P < 0.001***

Invisalign-Nuvola

65.49

21.03

467

5.30

125.68

P < 0.05*

First molar

Air Nivol-F22

86.42

17.44

467

36.50

136.33

P < 0.001***

ALL IN-F22

130.53

17.44

467

80.61

180.44

P < 0.001***

Arc Angel-F22

108.14

17.44

467

58.23

158.06

P < 0.001***

F22-Invisalign

− 1131.39

16.76

467

− 1179.35

− 183.43

P < 0.001***

F22-Nuvola

− 1128.23

16.76

467

− 1176.19

− 180.27

P < 0.001***