Table 2 Flexural strengths (MPa) and tensile strengths (MPa) of the PUL, PUC, PUZ, and PET groups (n = 5).

From: Impact of toothbrushing on aesthetic and mechanical properties of hydrophilic antibacterial coating materials for orthodontic clear retainers

 

Group

Mean

S.D.

Median

Min–max

Flexural strengths

PUL

70.50a

4.05

68.27

67.72–77.27

PUC

64.38ab

2.94

64.84

59.64–67.12

PUZ

69.09a

4.31

68.54

64.61–75.21

PET

59.57b

3.93

57.47

56.21–64.32

Significance

 

**

  

Tensile strengths

PUL

45.67a

2.78

68.27

40.78–47.30

PUC

44.97a

0.89

64.84

43.95–46.22

PUZ

41.90ab

2.72

68.54

37.59–44.30

PET

34.28bc

0.88

57.47

33.39–35.74

Significance

 

**

  1. Superscript letters (a, b, c) indicate results of post hoc comparisons; groups sharing the same letter are not significantly different (p > 0.05). **p < 0.01.