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Progress in Orthodontics

Table 5 The results of the curve-fitting analysis of the ester peak for Invisalign (I)

From: Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro

Group

Peak area (%)

1743 cm−1

1732 cm−1

1714 cm−1

1699 cm−1

1684 cm−1

1672 cm−1

I-CO

–

16.7

23

50.5

9.8

–

I-RB

2.5

17.2

21.9

39.8

16.3

2.3

I-RC

–

17

21.7

50.3

11

–

I-ST

–

18.2

23.8

44.3

8.6

–

  1. 1732 cm−1: Free C=O groups of urethane and carbonate; 1714 cm−1: H–bonded C=O groups of urethane and carbonate; 1699 cm−1: H–bonded C=O groups of amorphous urethane segments; 1684 cm−1: H–bonded groups of low-ordered urethane segments; 1743, 1672 cm−1: Acid impurities
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