Comparison of spontaneous eruption and modified closed eruption technique with palatal traction in alignment of impacted maxillary central incisor teeth

Progress in Orthodontics

Table 3 Treatment length comparisons according to therapy type, cause of impaction and other baseline characteristics

	n	Mean	SD	Min	Max	Median	p
Orthodontic therapy type
Spontaneous eruption	13	21.9	6.9	11.0	33.0	23.0	0.99^a
Closed eruption	21	22.2	6.8	10.0	35.0	23.0	0.99^a
Cause of impaction
Supernumerary tooth	17	21.4	6.4	11.0	35.0	21.0	0.79^b
Root dilaceration	8	22.9	5.4	11.0	30.0	24.0
Not found	9	22.7	8.8	10.0	34.0	22.0
NS angle
15–42°	11	25.0	7.1	11.0	35.0	25.0	0.21^b
43–70°	11	20.4	4.5	12.0	26.0	21.0
71–98°	12	21.0	7.7	10.0	21.5	21.5
Degree of impaction
Simple	12	20.6	6.5	10.0	33.0	21.0	0.43^b
Medium	7	21.6	6.7	11.0	31.0	23.0
Complex	15	23.5	7.2	12.0	35.0	25.0
Apex maturation
Closed	6	23.6	5.3	15.0	31.0	24.5	0.42^a
Open	28	21.7	7.0	10.0	35.0	22.0	0.42^a