Table 1 Esthetic grade (mean ± standard deviation) and rank on the independent canine shape parameters (edge width and height) by orthodontists and laypersons

 0%

2.92 ± 1.09

6

2.98 ± 0.91

6

2.84 ± 1.21

5

2.86 ± 1.17

6

2.93 ± 1.03

6

 12.5%

3.06 ± 0.99

5

3.20 ± 1.78

5

2.79 ± 1.10

6

2.87 ± 1.00

5

3.04 ± 0.96

5

 25%

3.14 ± 1.04

4

3.27 ± 0.83

4

2.91 ± 1.16

4

2.94 ± 1.10

4

3.18 ± 0.97

4

 37.5%

3.21 ± 1.11

3

3.36 ± 1.04

3

2.98 ± 1.13

3

3.05 ± 1.08

3

3.23 ± 1.12

3

 50%

3.43 ± 1.18

1

3.53 ± 1.39

1

3.36 ± 0.98

1

3.40 ± 1.05

1

3.46 ± 1.27

1

 62.5%

3.30 ± 1.29

2

3.37 ± 1.37

2

3.26 ± 1.23

2

3.22 ± 1.18

2

3.38 ± 1.36

2

 75%

2.74 ± 1.34

7

2.77 ± 1.48

7

2.72 ± 1.23

7

2.72 ± 1.23

7

2.76 ± 1.41

7

 − 0.5 mm

3.15 ± 1.25

2

3.40 ± 1.24

2

3.02 ± 1.22

2

3.08 ± 1.23

2

3.25 ± 1.25

2

 0 mm

3.46 ± 1.03

1

3.86 ± 0.88

1

3.19 ± 1.06

1

3.31 ± 1.04

1

3.61 ± 1.00

1

 0.5 mm

3.13 ± 1.03

3

3.30 ± 0.87

3

2.99 ± 1.13

3

3.05 ± 1.08

3

3.18 ± 0.99

3

 1.0 mm

2.55 ± 1.16

4

2.29 ± 0.99

4

2.73 ± 1.22

4

2.58 ± 1.10

4

2.52 ± 1.19

4