Table 3.

Distributions of four alveolar bone thicknesses around upper central incisors and p values from Fisher’s exact test for comparisons between Class I and III canine relationships

	Class I	Class III	Total	p
MBT
≥ 0 < 0.5 mm	3 (5.6%)	1 (1.9%)	4 (3.7%)	0.699
≥ 0.5 < 1.0 mm	31 (57.4%)	33 (56.6%)	64 (57.0%)
≥ 1.0 < 1.5 mm	18 (33.3%)	18 (34.0%)	36 (33.6%)
≥ 1.5 < 2.0 mm	2 (3.7%)	4 (7.5%)	6 (5.6%)
Total	54 (100.0%)	53 (100.0%)	107 (100.0%)
MPT
≥ 0 < 1.5 mm	2 (3.7%)	8 (15.1%)	10 (9.3%)	0.030*
≥ 1.5 < 3.0 mm	26 (48.1%)	31 (58.5%)	57 (53.3%)
≥ 3.0 < 4.5 mm	20 (37.0%)	13 (24.5%)	33 (30.8%)
≥ 4.5 mm	6 (11.1%)	1 (1.9%)	7 (6.5%)
Total	54 (100.0%)	53 (100.0%)	107 (100.0%)
ABT
≥ 0 < 1.5 mm	7 (13.0%)	2 (3.8%)	9 (8.4%)	0.024*
≥ 1.5 < 3.0 mm	42 (77.8%)	36 (67.9%)	78 (72.9%)
≥ 3.0 < 4.5 mm	5 (9.3%)	13 (24.5%)	18 (16.8%)
≥ 4.5 mm	0 (0.0%)	2 (3.8%)	2 (1.9%)
Total	54 (100.0%)	53 (100.0%)	107 (100.0%)
APT
≥ 0 < 3.0 mm	0 (0.0%)	0 (0.0%)	0 (0.0%)	0.000*
≥ 3.0 < 6.0 mm	5 (9.3%)	19 (35.8%)	24 (22.4%)
≥ 6.0 < 9.0 mm	27 (50.0%)	30 (56.6%)	57 (53.3%)
≥ 9.0 mm	22 (40.7%)	4 (7.5%)	26 (24.3%)
Total	54 (100.0%)	53 (100.0%)	107 (100.0%)

MBT mid-root buccal thickness, MPT mid-root palatal thickness, ABT apical buccal thickness, APT apical palatal thickness

*Statistically significant (p < 0.05)