Skip to main content

Table 3 Changes in the anteroposterior and vertical dentoskeletal variables after rapid maxillary expansion (RME)

From: Comparison of dentoskeletal and soft tissue changes between tooth-borne and tooth-bone-borne hybrid nonsurgical rapid maxillary expansions in adults: a retrospective observational study

Dentoskeletal variables

T-RME

H-RME

Intergroup p value‡

T1

T2

Change

Intragroup p value†

T1

T2

Change

Intragroup p value†

Skeletal variables

SNA (°)

78.80 ± 3.66

79.44 ± 3.22

0.64 ± 1.39

0.073

79.92 ± 3.04

80.44 ± 3.25

0.52 ± 0.98

0.021

0.960

SNB (°)

77.51 ± 3.58

76.86 ± 3.73

− 0.65 ± 0.97

0.014

78.07 ± 4.94

77.56 ± 4.69

− 0.51 ± 1.28

0.060

0.890

ANB (°)

1.29 ± 2.11

2.58 ± 2.22

1.29 ± 1.42

 < 0.001

1.85 ± 3.48

2.88 ± 3.10

1.04 ± 0.99

0.001

0.950

A to N perp (mm)

− 1.90 ± 2.95

− 1.37 ± 2.63

0.53 ± 1.37

0.052

− 1.43 ± 3.70

− 0.09 ± 3.98

1.34 ± 1.39

0.001

0.005

Pog to N perp (mm)

− 6.30 ± 6.66

− 8.43 ± 7.13

− 2.13 ± 1.76

< 0.001

− 6.51 ± 10.26

− 6.33 ± 10.38

0.17 ± 2.33

0.821

0.002

FMA (°)

29.96 ± 4.28

31.24 ± 4.49

1.28 ± 1.03

 < 0.001

32.01 ± 6.96

31.91 ± 7.16

− 0.10 ± 1.29

0.715

0.001

LAFH (mm)

76.92 ± 7.12

78.56 ± 6.91

1.64 ± 1.18

 < 0.001

78.51 ± 5.21

78.29 ± 5.23

− 0.22 ± 2.18

0.889

 < 0.001

Palatal plane angle (°)

1.33 ± 2.98

1.25 ± 2.77

− 0.08 ± 1.17

0.821

1.37 ± 4.12

0.79 ± 3.93

− 0.58 ± 1.27

0.063

0.170

Dentoalveolar variables

U1 to SN (°)

103.19 ± 6.43

100.45 ± 6.51

− 2.74 ± 2.37

 < 0.001

107.25 ± 7.59

103.21 ± 6.93

− 4.03 ± 3.41

 < 0.001

0.163

U1 to FH (°)

112.76 ± 6.22

109.88 ± 6.47

− 2.88 ± 2.07

 < 0.001

116.15 ± 7.88

112.70 ± 7.24

− 3.46 ± 3.35

0.001

0.505

U1 IE to FH (mm)

61.42 ± 3.57

62.50 ± 3.73

1.08 ± 0.85

 < 0.001

62.10 ± 3.79

62.59 ± 3.77

0.49 ± 2.07

0.035

0.333

U6 MBC to FH (mm)

54.85 ± 3.51

55.43 ± 3.76

0.58 ± 1.16

0.046

55.79 ± 2.85

55.74 ± 3.22

− 0.05 ± 1.74

0.664

0.314

Overjet (mm)

2.76 ± 2.72

2.94 ± 2.52

0.18 ± 1.13

0.715

3.27 ± 3.78

3.66 ± 3.32

0.39 ± 1.24

0.085

0.285

Overbite (mm)

0.44 ± 2.74

− 0.14 ± 2.88

− 0.58 ± 1.06

0.033

0.02 ± 3.95

0.14 ± 3.67

0.13 ± 1.19

0.211

0.019

  1. Data are presented as mean ± standard deviation
  2. T-RME, the group who received RME procedure with the conventional tooth-born expander; H-RME, the group underwent RME using the tooth-bone-borne hybrid expander; T1, pretreatment; T2, after RME (at least 6 weeks after fixation of the expander); Change, change in each variable after RME; SNA, sella–nasion-A point; SNB, sella–nasion-B point; ANB, A point-nasion-B point; A to N perp, A point to nasion perpendicular; Pog to N perp, pogonion to nasion perpendicular; FMA, Frankfort-mandibular plane angle; LAFH, lower anterior facial height; U1 to SN, maxillary incisor to sella–nasion plane angle; U1 to FH, maxillary incisor to Frankfort horizontal plane angle; U1 IE to FH, maxillary incisal edge to Frankfort horizontal plane; U6 MBC to FH, maxillary first molar mesiobuccal cusp to Frankfort horizontal plane
  3. †The Wilcoxon signed-rank test was used to analyse the significance of changes in the variables within a group
  4. ‡The Mann–Whitney U test was used to analyse the significance of differences in changes between the groups
Back to article page

BMC Oral Health

ISSN: 1472-6831

Contact us