Number children randomised

Number of children lost to follow‐up

Number completing treatment

Treatment success

Children

Bilateral partially displaced canines (total PDC)

Treatment success

Extraction

(EG)

Extraction plus headgear (EHG)

Control

(CG)

Total

Extraction

(EG)

Extraction plus headgear (EHG)

Control

(CG)

Total

Extraction

(EG)

Extraction plus headgear (EHG)

Control

(CG)

Baccetti 2008

75

5

23

24

22

69

2 (25)

11 (35)

2 (26)

15 (86)

65.2%

87.5%

36%

Difference between EG & CG (Chi² = 8.7, P < 0.01)

Difference between EHG & CG (Chi² = 23.5, P < 0.001)

Difference between EHG & EG (Chi² = 5.2, P < 0.01)

Leonardi 2004

50

7

11

21

14

46

3 (14)

11 (32)

2 (16)

62

50%

80%

?

Difference between EG & CG (Chi² = 2.01, P = 0.15)

Difference between EHG & CG (Chi² = 14.9, P < 0)

Difference between EHG & EG (Chi² = 4.69, P < 0.05)