Three-dimensional evaluation of root dimensions and alveolar ridge width of maxillary lateral incisors in patients with unilateral agenesis

Progress in Orthodontics

Table 4 Bone thickness parameters measured from sagittal sections

	Group	Mean	SD	25th percentile	50th percentile	75th percentile	p
Sagittal method
Labial bone thickness (mm)
2 mm apical to CEJ	MLIA	0.00	0.00	0.00	0.00	0.00	0.317
2 mm apical to CEJ	Control	0.10	0.40	0.00	0.00	0.00	0.317
4 mm apical to CEJ	MLIA	0.52	0.57	0.00	0.40	1.00	0.015
4 mm apical to CEJ	Control	1.04	0.48	0.65	1.05	1.15	0.015
6 mm apical to CEJ	MLIA	1.24	0.55	1.00	1.20	1.50	0.983
6 mm apical to CEJ	Control	1.27	0.68	0.75	1.35	1.40	0.983
10 mm apical to CEJ	MLIA	1.61	0.65	1.20	1.30	1.90	0.328
10 mm apical to CEJ	Control	1.81	0.92	1.25	1.80	2.10
Palatal bone thickness (mm)
2 mm apical to CEJ	MLIA	0.13	0.35	0.00	0.00	0.00	0.229
2 mm apical to CEJ	Control	0.27	0.44	0.00	0.00	0.00
4 mm apical to CEJ	MLIA	1.03	0.94	0.00	0.90	1.50	0.771
4 mm apical to CEJ	Control	1.09	0.73	0.50	1.15	1.45
6 mm apical to CEJ	MLIA	1.83	1.23	1.00	1.20	2.20	0.740
6 mm apical to CEJ	Control	1.55	1.03	0.80	1.45	2.15
10 mm apical to CEJ	MLIA	3.15	1.99	1.60	2.80	4.80	0.575
10 mm apical to CEJ	Control	2.61	1.82	1.60	1.85	3.75
Total labiopalatal alveolar ridge width (mm), includes tooth width
2 mm apical to CEJ	MLIA	5.43	0.99	4.70	5.30	5.80	0.002*
2 mm apical to CEJ	Control	6.43	0.65	6.00	6.15	6.95
4 mm apical to CEJ	MLIA	6.43	1.53	5.50	5.90	7.80	0.026
4 mm apical to CEJ	Control	7.47	0.71	6.80	7.55	7.90
6 mm apical to CEJ	MLIA	7.33	1.25	6.40	7.40	8.60	0.520
6 mm apical to CEJ	Control	7.68	1.03	7.00	7.65	8.25
10 mm apical to CEJ	MLIA	7.90	1.93	6.30	8.50	9.50	0.787
10 mm apical to CEJ	Control	8.02	1.26	7.35	7.95	8.20

Since four distance points from CEJ were used to examine outcomes, in order to minimize type 1 errors arising from multiple outcome assessments (at four different levels: 2 mm apical to CEJ, 4 mm apical to CEJ, 6 mm apical to CEJ, and 10 mm apical to CEJ), adjustments (based on Bonferroni formula) were made to p values to be deemed statistically significant. A p value of <0.012 was deemed to be statistically significant
*p value is statistically significant at p < 0.012