Diagnostic aids

Direction of cracks

Total

x2

p value

Mesiodistal

n = 161

n (%)

Buccolingual

n = 99

n (%)

Combination

n = 4

n (%)

Naked eye

6 (3.7)

82 (82.8)

4 (100)

88

200.997

<0.001

Transillumination

105 (65.2)

13 (13.1)

0 (0.0)

118

70.565

<0.001

Dye

20 (12.4)

6 (6.1)

0 (0.0)

26

3.238

0.198

Magnification

30 (18.6)

2 (2.0)

0 (0.0)

32

20.602

<0.001