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Progress in Orthodontics

Table 1 Descriptive and inferential statistics of radicular volumetric changes (mm3 and percentage) 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 (mm3)

T0–T1 (%)

   

TB group

 

BB group

  

TB group

 

BB group

     
 

Teeth

n

Mean

SD

p value*

Mean

SD

p value*

p value**

Teeth

n

Mean

SD

p value*

Mean

SD

p value*

p value**

Upper (Test)

P1

20

6.42

3.63

p < 0.05

1.04

0.62

p < 0.05

p < 0.05

t

20

5.39

2.75

NS

0.89

0.63

NS

p < 0.05

P2

20

5.26

3.62

1.24

0.57

p < 0.05

t

20

4.05

2.6

1.02

0.48

p < 0.05

M1

20

17.03

9.55

3.11

2.4

p < 0.05

t

20

5.35

2.94

0.99

0.79

p < 0.05

  1. P1 first premolar; P2 second premolar; M1 first molar; TB tooth borne; BB bone borne; T0 pre-treatment; T1 post-retention; n = number of teeth; SD standard deviation; NS not significant
  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** based on independent Student’s t test for inter-group comparison and set at p < 0.05
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