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Table 3 Comparison of displacement between RME and I-RME

From: Comparison and evaluation of stresses generated by rapid maxillary expansion and the implant-supported rapid maxillary expansion on the craniofacial structures using finite element method of stress analysis

Site RME Implant-supported RME
“X” direction (mm) “Y” direction (mm) “Z” direction (mm) “X” direction (mm) “Y” direction (mm) “Z” direction (mm)
Midpalatal suture 4.47 3.40 1.48 0.555 2.132 −1.242
Naso-maxillary suture 3.55 1.54 0.24 0.788 1.715 0.110
Zygomatico-maxillary suture 3.59 0.21 0.44 3.017 3.462 2.184
Pterygo-maxillary suture 4.64 1.01 0.58 1.119 2.127 1.612
Intranasal suture 0.392 1.80 −0.67 −0.72 2.28 0.045
Fronto-maxillary suture 1.53 1.18 0.03 0.12 2.39 0.45
Naso-frontal suture 0.54 1.14 0.001 −0.73 1.46 0.15
Zygomatico-temporal suture 0.78 0.49 1.38 −0.227 0.306 1.919
Zygomatico-frontal suture 0.19 0.68 1.09 0.43 1.02 1.57
Spheno-occipital synchondrosis 0.00002 0.002 0.0001 0.116 0.580 0.535
  1. X direction, Negative value denotes lateral displacement; positive denotes medial displacement
  2. Y direction, Negative value denotes posterior displacement; positive denotes anterior displacement
  3. Z direction, Negative value denotes superior displacement; positive denotes inferior displacement