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

Progress in Orthodontics

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)

	iTero vs model scan	TRIOS vs model scan	P value
	Mean ± SD	Mean ± SD	P value
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

P values were obtained from paired t test. X, Y, and Z directions indicate mediolateral, superoinferior, and anteroposterior directions, respectively.
SD standard deviation
^*In the maxilla, positive value in the X, Y, and Z directions indicates medial, apical, and anterior displacement
^†In the maxilla, negative value in the X, Y, and Z directions indicates buccal, occlusal, and posterior displacement
^‡In the maxilla, negative value in the X, Y, and Z directions indicates palatal, occlusal, and posterior displacement
^§In the mandible, negative value in the X, Y, and Z directions indicates lateral, apical, and lingual displacement
^∥In the mandible, positive value in the X, Y, and Z directions indicates lingual, occlusal, and anterior displacement
^¶In the mandible, positive value in the X, Y, and Z directions indicates buccal, occlusal, and anterior displacement