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Table 3 Three-dimensional discrepancy between each intraoral scan and model in the incisor and molar regions and its comparison between the iTero and TRIOS scanners (unit: mm)

From: Comparison of two intraoral scanners based on three-dimensional surface analysis

  iTero vs model scan TRIOS vs model scan P value
Mean ± SD Mean ± SD
Maxilla
 Midpoint between central incisors*    
  X-directional displacement 0.06 ± 0.04 0.04 ± 0.03 0.311
  Y-directional displacement 0.03 ± 0.10 0.02 ± 0.10 0.758
  Z-directional displacement 0.01 ± 0.06 0.01 ± 0.09 0.508
 First molar mesiolingual cusp, right
  X-directional displacement 0.11 ± 0.09 0.08 ± 0.09 0.738
  Y-directional displacement − 0.11 ± 0.07 − 0.09 ± 0.08 0.386
  Z-directional displacement 0.04 ± 0.08 0.02 ± 0.11 0.672
 First molar mesiolingual cusp, left
  X-directional displacement − 0.11 ± 0.11 − 0.06 ± 0.12 0.377
  Y-directional displacement − 0.01 ± 0.10 − 0.06 ± 0.07 0.281
  Z-directional displacement 0.04 ± 0.08 0.05 ± 0.04 0.838
Mandible
 Midpoint between central incisors§    
  X-directional displacement − 0.02 ± 0.06 0.02 ± 0.08 0.168
  Y-directional displacement − 0.07 ± 0.13 − 0.09 ± 0.09 0.757
  Z-directional displacement − 0.02 ± 0.09 − 0.09 ± 0.10 0.069
 First molar mesiolingual cusp, right
  X-directional displacement 0.01 ± 0.12 0.07 ± 0.10 0.163
  Y-directional displacement 0.12 ± 0.11 0.12 ± 0.08 0.866
  Z-directional displacement 0.09 ± 0.17 0.05 ± 0.11 0.410
 First molar mesiolingual cusp, left
  X-directional displacement 0.01 ± 0.11 0.02 ± 0.12 0.382
  Y-directional displacement 0.07 ± 0.11 0.10 ± 0.06 0.539
  Z-directional displacement 0.15 ± 0.17 0.15 ± 0.07 0.964
  1. P values were obtained from paired t test. X, Y, and Z directions indicate mediolateral, superoinferior, and anteroposterior directions, respectively.
  2. SD standard deviation
  3. *In the maxilla, positive value in the X, Y, and Z directions indicates medial, apical, and anterior displacement
  4. In the maxilla, negative value in the X, Y, and Z directions indicates buccal, occlusal, and posterior displacement
  5. In the maxilla, negative value in the X, Y, and Z directions indicates palatal, occlusal, and posterior displacement
  6. §In the mandible, negative value in the X, Y, and Z directions indicates lateral, apical, and lingual displacement
  7. In the mandible, positive value in the X, Y, and Z directions indicates lingual, occlusal, and anterior displacement
  8. In the mandible, positive value in the X, Y, and Z directions indicates buccal, occlusal, and anterior displacement