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Progress in Orthodontics
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Table 3 Dental cast analysis in RME and MME groups

From: Comparison between rapid and mixed maxillary expansion through an assessment of arch changes on dental casts

  Initial Change after treatment Final
  RME group MME group   RME group MME group RME group MME group  
T0 T0   T1–T0 T1–T0 T1 T1  
Cast measure (mm) Mean SD Mean SD p value Mean p value Mean p value Mean SD Mean SD p value
Maxillary arch width    
 Intermolar 43.2 1.576 41.62 3.72 ns 8.8 *** 8.7 *** 52 2.40 50.31 5.30 ns
 Inter second premolar 38.39 1.784 36.93 2.78 ns 7.28 *** 6.9 *** 45.67 2.15 43.83 4.52 ns
 Inter first premolar 33.9 1.698 32.66 2.23 ns 6.82 *** 7.33 *** 40.72 2.47 40 4.40 ns
 Intercanine 29.32 2.135 28.62 2.26 ns 4.3 *** 3.70 *** 33.62 1.55 32.33 2.12 *
Mandibular arch width    
 Intermolar 41.37 2.139 41.2 2.57 ns 1.5 * 2.09 ** 42.87 2.35 43.29 2.62 ns
 Inter second premolar 36.02 1.874 35.27 2.61 ns 1.17 * 2.36 ** 37.2 1.69 37.63 2.79 ns
 Inter first premolar 30.55 2.356 29.88 1.85 ns 0.8 ns 1.91 ** 31.35 1.38 31.79 2.44 ns
 Intercanine 24.9 1.382 24.45 1.50 ns 0.85 ns 1.13 * 25.75 1.58 25.59 1.68 ns
 Maxillary arch depth 28.61 1.909 27.5 1.98 ns −0.59 ns −0.16 ns 28.02 2.80 27.34 2.18 ns
 Mandibular arch depth 25.17 1.599 23.59 1.86 ns 0.3 ns −0.59 ns 25.47 1.59 23 2.37 ***
  1. ns not significant
  2. *p < 0.05; **p < 0.01; ***p < 0.001;
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