Skip to main content
Progress in Orthodontics

Table 2 Descriptive and inferential statistics of radicular length changes occurred after maxillary expansion

From: External root resorption (ERR) and rapid maxillary expansion (RME) at post-retention stage: a comparison between tooth-borne and bone-borne RME

T0–T1 (mm)

  

TB group

 

BB group

  

Teeth

n

Mean

SD

p value*

Mean

SD

p value*

p value**

P1

20

0.31

0.16

p < 0.05

0.04

0.02

p < 0.05

p < 0.05

P2

20

0.23

0.12

0.07

0.03

p < 0.05

M1m (c)

20

0.22

0.10

0.07

0.03

p < 0.05

M1d (d)

20

0.25

0.15

0.06

0.02

p < 0.05

M1p (e)

20

0.33

0.19

0.11

0.04

p < 0.05

  1. P1 first premolar; P2 second premolar; M1m first molar mesial root; M1d first molar distal root; M1p first molar palatal root; TB tooth borne; BB bone borne; T0 pre-treatment; T1 post-retention; n number of teeth; SD standard deviation
  2. p value* based on one-way analysis of variance (ANOVA) for intra-group comparison (different teeth) and set at p < 0.05; post hoc assessment performed according to the Bonferroni’s multiple comparisons test
  3. p value** base on independent Student’s t test for inter-group comparisons and set at p < 0.05
Back to article page