Table 4 Descriptive values of ∆T of the retainer materials with different surface textures, types of stains and cleaning solutions – Mean (SD)

Materials

Stains by

Surface and Cleaning Solutions

Coffee

Tea

Wine

Rough

Smooth

Rough

Smooth

Rough

Smooth

Polyurethane

Invisalign® Crystals

23.197^a

(0.608)

15.521 ^a

(0.327)

19.638

(0.552)

19.224

(0.471)

0.701

(0.755)

1.107

(0.764)

Retainer Brite®

23.523^a

(0.428)

15.515^a

(0.537)

19.956^a

(0.780)

19.238^a

(0.289)

0.838

(0.860)

0.820

(0.214)

Listerine® Mouthwash

23.556^a

(0.270)

15.538^a

(0.289)

19.452

(0.887)

19.454

(0.561)

0.453

(0.675)

0.804

(0.274)

Polident®

23.095^a

(0.720)

15.599^a

(0.845)

19.557

(1.022)

19.236

(0.402)

0.514 ^a

(0.655)

1.020 ^a

(0.349)

H₂O₂

22.769 ^a

(0.870)

15.079 ^a

(0.909)

19.788

(1.232)

19.679

(0.816)

0.476 ^a

(0.482)

0.981 ^a

(0.564)

Copolyester

Invisalign® Crystals

22.53 ^a

(1.094)

16.262 ^a

(0.285))

24.108

(0.824)

21.715

(3.8665

1.270

(0.819)

1.088

(0.584)

Retainer Brite®

22.961^a,d

(0.418)

16.072 ^a

(0.544)

24.188

(0.643)

21.452

(3.873)

2.100

(0.931)

1.174

(0.396)

Listerine® Mouthwash

21.931 ^a,c

(0.622)

15.614 ^a,b

(0.565)

24.031

(1.941)

20.981

(4.380)

1.681

(1.043)

0.758

(0.534)

Polident®

22.084 ^a

(0.837)

15.734 ^a,b

(0.317)

23.633

(0.988)

21.902

(4.222)

1.395

(0.587)

1.044

(0.280)

H₂O₂

22.098 ^a

(1.648)

15.618 ^a,b

(0.502)

23.446 ^b,c,d

(4.087)

20.808

(4.251)

1.576 ^a

(0.667)

0.944 ^a

(0.277)