Root resorption of self-ligating and conventional preadjusted brackets in severe anterior crowding Class I patients: a longitudinal retrospective study

Table 4 Root Resorption in percentage of root shortening and in millimeters Between Group I (Self-ligating Brackets) and Group II (Conventional Preadjusted Brackets)

Measurements, mm	Group 1		Group2		95 % CIs		P
Measurements, mm	Mean	SD	Mean	SD	lower	upper	P
Maxillary central incisor %	2.61		4.13				NS
mm	0.3	0.4	0.5	0.3	−0.29	1.08
Maxillary lateral incisor %	2.00		2.60				NS
mm	0.2	0.3	0.3	0.5	−0.53	1.03
Mandibular central incisor %	3.73		3.47				NS
mm	0.4	0.4	0.4	0.5	−0.38	1.18
Mandibular lateral incisor %	2.60		2.75				NS
mm	0.3	0.3	0.3	0.5	−0.48	1.08

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