Table 2.
Horizontal distortion of 3D images assessed by mean absolute error in arch widths between digital and actual measurements (unit: mm).
| E4D Dentist | iTero | |||||
|---|---|---|---|---|---|---|
| Model B | Model L | Significant | Model B | Model L | Significant | |
| Maxillary intermolar width | 1.76 (1.7) | 1.23 (1.32) | NS | 0.36 (0.31) | 0.29 (0.32) | NS |
| Mandibular intermolar width | 0.44 (0.44) | 0.29 (0.31) | NS | 0.18 (0.39) | 0.60 (0.16) | ∗ |
| Maxillary intercanine width | 0.93 (0.59) | 0.56 (0.82) | NS | 0.18 (0.15) | 0.34 (0.10) | ∗ |
| Mandibular intercanine width | 0.39 (0.26) | 0.17 (0.24) | NS | 0.17 (0.27) | 0.49 (0.56) | ∗ |
|
| ||||||
| Trios | Zfx IntraScan | |||||
| Model B | Model L | Significant | Model B | Model L | Significant | |
|
| ||||||
| Maxillary intermolar width | 0.42 (0.58) | 0.26 (0.34) | NS | 0.79 (1.07) | 0.69 (0.95) | NS |
| Mandibular intermolar width | 0.15 (0.11) | 0.38 (0.44) | ∗ | 0.60 (1.06) | 0.81 (1.03) | NS |
| Maxillary intercanine width | 0.20 (0.16) | 0.18 (0.16) | NS | 0.09 (0.27) | 0.26 (0.31) | NS |
| Mandibular intercanine width | 0.35 (0.21) | 0.46 (0.22) | NS | 0.17 (0.40) | 0.45 (1.44) | NS |
( ): maximum deviation, which is the difference between maximum and minimum errors of 5 repeated images, which refers to the largest distortion considered as precision of the scanner.
∗ P < 0.05 (Mann–Whitney U test).
NS: not significant.