Root resorption after leveling with super-elastic and conventional steel arch wires: a prospective study

Progress in Orthodontics

Table 2 Root resorption in millimeters and in percentage of the initial root length in the two groups

	Super-elastic group				Stainless steel group				95% CI	Pvalue
	N	Mean	SD	Range	N	Mean	SD	Range	95% CI	Pvalue
Tooth 12	19				19
mm		1.07	0.91	0.00 to 2.90		0.91	1.09	−0.50 to 3.80	−0.50 to 0.82	0.62
%		6.69	5.78	0.00 to 18.24		5.14	5.42	−3.21 to 17.27	−2.14 to 5.24	0.40
Tooth 11	24				21
mm		0.89	1.11	−1.20 to 3.60		0.68	0.68	−0.40 to 2.50	−0.36 to 0.77	0.46
%		5.33	6.81	−7.89 to 3.18		3.88	3.69	−2.38 to 12.69	−1.91 to 4.82	0.39
Tooth 21	23				21
mm		0.53	0.92	−1.40 to 2.70		0.71	0.92	−0.90 to 2.90	−0.74 to 0.38	0.52
%		3.22	5.73	−8.38 to 8.49		3.88	5.36	−7.03 to 17.16	−4.05 to 2.72	0.70
Tooth 22	19				21
mm		0.96	0.77	−0.10 to 2.50		0.65	0.52	0.00 to 1.80	−0.11 to 0.73	0.14
%		5.94	4.90	−0.55 to 6.67		3.96	3.11	0.00 to 12.16	−0.62 to 4.58	0.13
Tooth 32	18				13
mm		0.94	0.77	0.00 to 2.90		1.14	0.88	0.00 to 3.40	−0.81 to 0.41	0.51
%		5.66	4.61	0.00 to 17.47		6.56	5.04	0.00 to 19.54	−4.48 to 2.66	0.61
Tooth 31	22				22
mm		1.00	0.71	0.00 to 2.70		0.47	0.58	−0.30 to 1.90	0.13 to 0.92	0.01
%		6.32	4.15	0.00 to 15.88		2.95	3.61	−2.01 to 11.38	1.00 to 5.73	0.01
Tooth 41	23				21
mm		0.97	1.09	0.00 to 4.00		0.61	0.46	0.00 to 1.60	−0.16 to 0.87	0.17
%		6.03	6.63	0.00 to 25.97		3.87	2.95	0.00 to 9.94	−1.02 to 5.33	0.18
Tooth 42	18				18
mm		1.20	0.89	0.00 to 3.90		1.14	0.58	0.30 to 2.30	−0.46 to 0.57	0.83
%		6.88	4.86	0.00 to 19.60		6.41	3.09	1.67 to 12.71	−2.29 to 3.23	0.73