Table 5.

Comparison of inter-root distance between estimated and actual tooth models in deep learning method (unit: mm)

	Estimated tooth model				Actual tooth model				P value*
	Mean	SD	Max	Min	Mean	SD	Max	Min
Maxilla, Rt
Inter-root distances between U6 and U5	8.6	1.1	9.8	7.0	8.6	0.7	9.4	7.8	0.935
Inter-root distances between U5 and U3	6.4	1.0	7.6	5.2	6.5	1.0	7.9	5.4	0.476
Inter-root distances between U3 and U2	10.1	1.4	12.0	8.6	10.1	0.8	11.4	9.5	0.930
Inter-root distances between U2 and U1	6.8	1.8	9.1	5.0	6.8	1.3	8.3	5.6	0.869
Maxilla, Lt
Inter-root distances between U6 and U5	8.1	0.5	8.7	7.5	9.1	0.7	10.1	8.0	0.065
Inter-root distances between U5 and U3	5.7	1.4	7.6	4.2	5.6	1.4	6.9	3.4	0.618
Inter-root distances between U3 and U2	9.6	2.2	12.5	6.5	9.4	1.8	11.1	6.7	0.670
Inter-root distances between U2 and U1	6.3	1.4	8.1	4.5	6.2	1.2	7.7	4.9	0.780
Mandible, Rt
Inter-root distances between L6 and L5	7.0	1.2	8.3	5.7	7.0	0.7	7.9	6.1	0.882
Inter-root distances between L5 and L3	6.2	0.5	6.7	5.4	6.7	1.3	8.9	5.6	0.353
Inter-root distances between L3 and L2	7.2	1.1	8.6	6.0	6.8	0.8	8.1	6.1	0.159
Inter-root distances between L2 and L1	5.1	1.1	6.3	3.4	4.4	0.4	5.0	3.9	0.227
Mandible, Lt
Inter-root distances between L6 and L5	7.8	1.3	9.1	5.7	7.4	1.4	9.3	5.3	0.128
Inter-root distances between L5 and L3	6.0	1.2	7.6	4.8	7.0	1.7	9.2	5.3	0.042*
Inter-root distances between L3 and L2	7.9	1.0	9.1	6.9	7.1	1.1	8.7	5.8	0.149
Inter-root distances between L2 and L1	4.6	0.3	4.9	4.1	4.8	0.5	5.3	4.0	0.714

SD, Standard deviation

*The results of paired t test. U6, maxillary first molar; U5, maxillary second premolar; U3, maxillary canine; U2, maxillary lateral incisor; U1, maxillary central incisor. L6, mandibular first molar; L5, mandibular second premolar; L3, mandibular canine; L2, mandibular lateral incisor; L1, mandibular central incisor