Table 5 Descriptive values of NBS of the retainer materials with different surface textures, 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

19.277^a

(0.263)

13.443^a

(0.288)

16.447^a

(0.248)

18.169^a

(0.237)

2.537

(0.480)

2.405

(0.368)

Retainer Brite®

19.485^a

(0.208)

13.381^a

(0.405)

16.380^a

(0.230)

18.145^a

(0.262)

2.489

(0.331)

2.191

(0.312)

Listerine® Mouthwash

19.360^a

(0.283)

13.287^a

(0.306)

16.415^a

(0.304)

18.174^a

(0.171)

2.320

(0.302)

2.415

(0.261)

Polident®

19.311^a

(0.297)

13.270^a

(0.313)

16.401^a

(0.160)

18.144^a

(0.331)

2.510 ^a

(0.248)

2.223 ^a

(0.332)

H₂O₂

18.854^{a, b, c, d, e}

(0.477)

12.796^{a, b, c, d, e}

(0.339)

16.272^a

(0.183)

17.969^a

(0.247)

2.456

(0.246)

2.255

(0.194)

Copolyester

Invisalign® Crystals

15.107 ^a

(0.372)

11.013 ^a

(0.182)

15.724 ^a

(0.292)

13.502 ^a

(0.161)

2.757 ^a

(0.331)

1.729 ^a

(0.145)

Retainer Brite®

15.024 ^a

(0.255)

10.983 ^a

(0.285)

15.720 ^a

(0.289)

13.170 ^a

(0.403)

2.701 ^a

(0.297)

1.741 ^a

(0.144)

Listerine® Mouthwash

14.539 ^a

(0.496)

10.697 ^a

(0.468)

15.433 ^a

(0.714)

13.175 ^a,b

(0.284)

2.684 ^a

(0.330)

1.782 ^a,e

(0.174)

Polident®

14.722 ^a

(0.343)

10.822 ^a

(0.453)

15.731 ^a

(0.268)

13.350 ^a

(0.177)

2.829 ^a

(0.336)

1.550 ^a,d

(0.157)

H₂O₂

14.169 ^a,b,c

(0.670)

10.580 ^a

(0.251)

14.591 ^a,b,c,e

(0.913)

12.689 ^a,b,c,e

(0.754)

2.752 ^a

(0.269)

1.551^a

(0.251)