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Table 2 Independent t test of the nodes on various displacement of expansion using RME and MSE (region of interest: upper first molar)

From: The difference of stress distribution of maxillary expansion using rapid maxillary expander (RME) and maxillary skeletal expander (MSE)—a finite element analysis

Expansion method Stress Displacement N Mean SD CI 95% p
  Lower Upper
RME Von Ms 0.5 mm 225 10.86904 1.181594 1.03669 1.38926 0.00*
MSE   225 9.65606 0.641251  
RME Von Ms 1 mm 225 1.49844 0.015366 − 5.23739 − 5.21068 0.00*
MSE   225 6.72249 0.100525  
RME Von Ms 1.5 mm 225 5.74535 0.128029 0.04932 0.0872 0.00*
MSE   225 5.67708 0.067008  
RME MaxPs 0.5 mm 225 4.31042 0.257529 − 4.54820 − 4.39736 0.00*
MSE   225 8.78321 0.514199  
RME MaxPs 1 mm 225 1.80901 0.044066 − 0.76577 − 0.75060 0.03*
MSE   225 2.56719 0.037552  
RME MaxPS 1.5 mm 225 11.36281 0.592480 − 15.3542 − 14.6147 0.00*
MSE   225 26.34729 2.752635  
RME MinPS 0.5 mm 225 − 0.09651 0.012786 0.14908 0.15695 0.00*
MSE   225 − 0.24953 0.027169  
RME MinPS 1 mm 225 − 0.72524 0.014304 1.00171 1.01227 0.00*
MSE   225 − 1.73224 0.037582  
RME MinPS 1.5 mm 225 − 0.45977 0.029023 0.19041 0.2124 0.00*
MSE   225 − 0.66117 0.078496  
  1. Independent t test, statistical significance was determined at the p < 0.05 level
  2. *Significant at p < 0.05 level
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