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Table 2 Sandblasting significantly increased mean shear bond strength (Mann–Whitney-U-test)

From: Shear bond strength of different retainer wires and bonding adhesives in consideration of the pretreatment process

Sandblasting

n

M

SD

U

z

p

r

Yes

100

109.57

28.04

8581

8.75

<0.001

0.62

No

100

50.49

50.32

    
  1. n = number of tested specimens; M = mean; SD = standard deviation; U = test statistic Mann–Whitney-U-test; z = standardized test statistic (z-score); p = significance level; r = Pearson’s correlation coefficient (effect size).
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Head & Face Medicine

ISSN: 1746-160X

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