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Table 3 Pre-aging absorbance values of the three aligners

From: Optical properties of orthodontic aligners—spectrophotometry analysis of three types before and after aging

Wavelength (nm)

All-In

Invisalign

F22

p value

400

0.265 ± 0.036

0.172 ± 0.004

0.107 ± 0.023

<0.0007

450

0.242 ± 0.035

0.158 ± 0.003

0.098 ± 0.024

<0.0012

500

0.230 ± 0.033

0.152 ± 0.003

0.096 ± 0.023

<0.0012

550

0.223 ± 0.031

0.148 ± 0.003

0.094 ± 0.022

<0.0013

600

0.217 ± 0.030

0.146 ± 0.003

0.093 ± 0.022

<0.0012

650

0.212 ± 0.030

0.144 ± 0.003

0.091 ± 0.023

<0.0015

700

0.209 ± 0.030

0.143 ± 0.004

0.090 ± 0.024

<0.0015

  1. Significance level p < 0.05