Three-dimensional partitioning and quantification of orthodontic root resorption via automatic root extraction from cone-beam computed tomography

Table 5 Comparison of percentage of external root resorption (ERR) in maxillary anterior teeth between extraction and non-extraction

Groups	Sample Size		ERR, % (Mean ± SD) / Median (P25, P75)		P Value ^ab
Groups	Extraction treatment	Non-extraction treatment	Extraction treatment	Non-extraction treatment	P Value ^ab
I	72	34	7.96 ± 6.77	5.83 ± 4.75	0.101^a
II	54	52	8.97(4.42,16.70)	5,31(2.66,13.62)	0.018*^b

*P< 0.05 indicates statistical significance
^a indicates Student’s t-test, ^b indicates Mann–Whitney U test
Abbreviation. Group I (aged 10–15 year-old) and Group II (aged > 15 year-old); ERR: the decrease in root volume at posttreatment compared to pretreatment

ISSN: 1472-6831