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Table 4 Descriptive statistics of dentoalveolar variables according to intervention groups at different timepoints

From: Skeletal and alveolar changes in conventional rapid palatal expansion (RPE) and miniscrew-assisted RPE (MARPE): a prospective randomized clinical trial using low-dose CBCT

Variables

Timepoint

RPE (N = 17)

MARPE (N = 19)

P value

PM-MW (mm)

T1-T0

3.48 ± 1.77††

4.40 ± 2.25††

0.175

T2-T1

− 1.31 ± 1.01††

− 0.41 ± 0.51

0.002**

T2-T0

2.16 ± 2.00

3.99 ± 2.46††

0.019**

PM-IDW (mm)

T1-T0

6.17 ± 1.52††

6.33 ± 1.41††

0.594

T2-T1

− 0.25 ± 0.50

− 0.66 ± 0.64††

0.071

T2-T0

5.92 ± 1.47†

5.67 ± 1.43†

0.602

M-MW (mm)

T1-T0

2.59 ± 1.17†

3.31 ± 0.82†

0.038*

T2-T1

− 0.94 ± 0.61†

− 0.48 ± 0.70

0.043*

T2-T0

1.65 ± 1.34†

2.85 ± 0.98†

0.004*

M-IDW (mm)

T1-T0

6.11 ± 1.29†

6.70 ± 1.10†

0.150

T2-T1

− 0.58 ± 0.55

− 0.53 ± 0.49

0.851

T2-T0

5.53 ± 1.47†

6.18 ± 1.23†

0.159

M-DI (°)

T1-T0

3.40 ± 2.47††

3.94 ± 1.61††

0.219

T2-T1

− 0.98 ± 1.25

− 1.92 ± 1.61††

0.208

T2-T0

2.41 ± 2.55††

2.02 ± 1.11††

0.975

  1. Descriptive statistics represented as mean ± standard deviation
  2. †Indicate statistical significance with repeated measures analysis of variance with Bonferroni correction (α = 0.016)
  3. †† Indicate statistical significance with Friedman’s analysis of variance by ranks (α = 0.05)
  4. *Indicate statistical significance with independent t-test at each time point (P < 0.05)
  5. **Indicate statistical significance with Mann–Whitney U test at each time point (P < 0.05)
  6. Abbreviations: RPE, rapid palatal expansion; MARPE, mini-screw assisted rapid palatal expansion; T0, before treatment; T1, immediately after expansion; T2, after a 3-month consolidation period