Table 5 Cross-sectional root configuration for non-C molars with 2 separate roots (n = 269)

Root

Section

Bowling pin^A

Kidney shaped^B

Long oval^B

Oval^B

Ribbon^B

Round^AB

Total

χ₂

p-value

Mesial

Coronal

n(%)

22(8.2%)

61(22.7%)

157(58.4%)

3(1.1%)

26(9.7%)

0(0.0%)

269(100.0%)

74.59

 < 0.001*

Middle

n(%)

47(17.5%)

66(24.5%)

156(58.0%)

0(0.0%)

0(0.0%)

0(0.0%)

269(100.0%)

Apical

n(%)

22(8.2%)

65(24.2%)

182(67.7%)

0(0.0%)

0(0.0%)

0(0.0%)

269(100.0%)

Root

Section

Bowling pin^ABC

Kidney shaped^A

Long oval^B

Oval^C

Ribbon^ABC

Round^B

Total

χ₂

p-value

Distal

Coronal

n(%)

2(0.7%)

68(25.3%)

37(13.8%)

101(37.5%)

2(0.7%)

59(21.9%)

269(100.0%)

219.54

 < 0.001*

Middle

n(%)

0(0.0%)

84(31.2%)

0(0.0%)

181(67.3%)

0(0.0%)

4(1.5%)

269(100.0%)

Apical

n(%)

0(0.0%)

53(19.7%)

0(0.0%)

216(80.3%)

0(0.0%)

0(0.0%)

269(100.0%)