Table 4 Differences in the perception of smile profiles attractiveness based on gender as well as being a dental or non-dental participant (total n = 435).

From: Relationships between perception of black triangles appearance, personality factors and level of education

Smile profiles

Dental vs. non-dental

Descriptive

t-test

Male vs female

Descriptive

t-test

Mean

SD

t

P

Mean

SD

t

P

Maxillary smiles

 No BT

Dental

9.05

1.35

− 0.454

0.650

Male

9.10

1.30

0.229

0.819

Non-dental

9.12

1.63

Female

9.07

1.49

 Single small central BT

Dental

6.97

1.71

− 2.714

0.007

Male

7.46

1.36

2.982

0.003

Non-dental

7.46

1.64

Female

6.94

1.82

 Single large central BT

Dental

6.33

1.65

− 2.084

0.038

Male

6.71

1.40

2.359

0.019

Non-dental

6.70

1.68

Female

6.31

1.77

 Multiple small BT

Dental

5.77

1.93

− 1.589

0.113

Male

6.05

1.86

1.231

0.219

Non-dental

6.12

2.25

Female

5.79

2.11

 Multiple large BT

Dental

3.43

2.18

− 2.715

0.007

Male

4.01

2.30

3.130

0.002

Non-dental

4.08

2.24

Female

3.39

2.15

Mandibular smiles

 No BT

Dental

8.88

1.40

1.126

0.261

Male

8.80

1.34

− 0.337

0.736

Non-dental

8.70

1.80

Female

8.86

1.60

 Single small central BT

Dental

7.21

1.52

− 0.126

0.900

Male

7.15

1.54

0.554

0.580

Non-dental

7.23

1.76

Female

7.25

1.62

 Single large central BT

Dental

5.90

1.80

− 2.323

0.021

Male

6.25

1.74

1.769

0.078

Non-dental

6.35

1.83

Female

5.92

1.85

 Multiple small BT

Dental

5.60

1.96

0.103

0.918

Male

5.93

1.82

2.359

0.019

Non-dental

5.58

2.01

Female

5.45

2.03

 Multiple large BT

Dental

3.89

2.10

− 0.801

0.423

Male

4.45

2.16

3.350

0.001

Non-dental

4.07

2.29

Female

3.71

2.12

  1. BT black triangle, M mean, SD standard deviation, t t-statistic, P probability value using independent t-test.
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