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Table 4 The distribution of arch forms between the Saudi sample and other ethnicities

From: Is arch form influenced by sagittal molar relationship or Bolton tooth-size discrepancy?

Arch Form

Egyptian [25] (n = 94)

Caucasian [25] (n = 92)

Israeli [24] (n = 134)

Korean [23] (n = 368)

Japanese [22] (n = 160)

Saudi Present Study (n = 230)

Square

29 (31 %)

19 (21 %)

23 (17.2 %)

172 (46.7 %)

73 (45.6 %)

64 (27.8 %)

Ovoid

37 (39 %)

39 (42 %)

68 (50.7 %)

127 (34.5 %)

68 (42.5 %)

87 (37.8 %)

Tapered

28 (30 %)

34 (37 %)

43 (32.1 %)

69 (18.8 %)

19 (11.9 %)

79 (34.3 %)

p-value

0.714

0.409

0.024*

<0.0001*

<0.0001*

 
  1. *Chi-square test: statistically significant. Data presented as n (%)