Table 2.

Comparison of the arch width between estimated and actual tooth models in manual method (unit: mm)

	Estimated tooth model				Actual tooth model				P value*
	Mean	SD	Max	Min	Mean	SD	Max	Min
Maxilla
Inter-incisor width U1	6.8	1.3	8.8	5.2	7.1	1.0	8.4	6.1	0.384
Inter-incisor width U2	16.6	2.0	19.9	14.9	17.4	2.3	20.6	14.6	0.170
Inter-canine width	32.3	1.9	35.0	30.0	32.0	1.9	35.0	30.0	0.233
Inter-premolar width	38.6	2.8	40.4	33.8	39.7	2.7	42.1	35.4	0.014*
Inter-molar width	50.3	2.8	52.2	45.4	51.2	3.0	54.5	46.4	0.145
Mandible
Inter-incisor width L1	4.0	1.6	6.7	2.8	4.0	1.2	5.9	2.9	0.946
Inter-incisor width L2	11.2	0.9	12.2	9.9	11.6	1.0	12.5	10.5	0.203
Inter-canine width	21.9	2.4	25.8	19.8	22.0	2.2	25.4	19.7	0.934
Inter-premolar width	30.3	1.6	33.0	29.0	32.0	2.2	35.1	29.7	0.018*
Inter-molar width	39.9	2.0	43.3	38.3	41.0	2.2	43.8	38.3	0.202

SD, Standard deviation

*The results of paired t test. U1, maxillary central incisors; U2, maxillary lateral incisors; L1, mandibular central incisors; L2, mandibular lateral incisors