Table 1.

Arch width digital measurements on 3D scan model images (unit: mm).

	E4D Dentist				iTero
	Model B	Model L	Max − min	Significant	Model B	Model L	Max − min	Significant
Maxillary intermolar width	53.49	53.87	2.06	NS	54.75	54.76	0.62	NS
Mandibular intermolar width	48.36	48.52	1.04	NS	48.80	49.43	0.77	∗
Maxillary intercanine width	35.49	35.89	0.82	NS	36.66	36.81	0.31	∗
Mandibular intercanine width	26.59	26.86	0.66	∗	27.18	27.47	0.81	∗
	Trios				Zfx IntraScan
	Model B	Model L	Max − min	Significant	Model B	Model L	Max − min	Significant
Maxillary intermolar width	54.66	54.77	0.64	NS	54.47	54.97	2.47	NS
Mandibular intermolar width	48.94	49.23	0.68	∗	49.12	49.63	1.98	NS
Maxillary intercanine width	36.24	36.66	0.50	NS	36.49	36.61	0.70	NS
Mandibular intercanine width	27.41	27.54	0.31	NS	27.10	27.09	1.98	NS

Model B: median measurement of model B.

Model L: median measurement of model L.

Max − min: difference of maximum and minimum measurements among 10 images of buccal and lingual models, which refers to the largest distortion according to buccal and lingual brackets.

^∗ P < 0.05 (Mann–Whitney U test).

NS: not significant.