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Table 1 Absorbance values of the three aligners before and after in vitro aging

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

Aligner Absorbance at 400 nm (±SD) Absorbance at 700 nm (±SD)
As received After aging Significance As received After aging Significance
All-In 0.265 ± 0.036 0.278 ± 0.011 N.S. 0.209 ± 0.030 0.215 ± 0.008 N.S.
Invisalign 0.172 ± 0.004 0.190 ± 0.03 N.S. 0.143 ± 0.004 0.155 ± 0.023 N.S.
F22 0.107 ± 0.023 0.104 ± 0.003 N.S. 0.090 ± 0.024 0.081 ± 0.004 N.S.
  1. N.S. not significant variation