Table 4 Comparison of the root length, vertical marginal bone level and black triangle areas before and after treatment

Root length

Central incisor (mm)

10.00

0.75

9.62

0.98

3.71

0.001*

Canine (mm)

13.45

1.10

12.84

1.39

4.04

0.001*

Vertical marginal bone level

Labial side of incisor (mm)

1.12

0.38

1.84

0.67

-4.92

< 0.001*

Lingual side of incisor (mm)

1.42

0.51

2.68

1.74

-3.07

0.006*

Labial side of canine (mm)

1.60

0.42

2.88

2.33

-2.53

0.021*

Lingual side of canine (mm)

1.41

0.43

2.14

0.72

-3.79

0.001*

Black triangle area

S12 (mm²)

2.22

0.70

3.89

1.45

-5.82

< 0.001*

S23(mm²)

3.12

0.99

4.20

1.34

-4.68

< 0.001*