Three-dimensional analysis of dental arch forms in Italian population

Progress in Orthodontics

Table 1 Descriptive analysis

	Number	Minimum	Maximum	Median	Mean	Standard deviation (SD)
Maxilla
Sup. ang. 1^a	104	105.2	155.5	125.6	126.4	9.4
Sup. ang. 2d^a	104	110.1	149.7	131.8	131.3	6.5
Sup. ang. 2s^a	104	115.1	145.9	132.1	132.4	6.5
Sup. ang. 3d^a	104	67.7	89.0	74.9	75.1	4.0
Sup. ang. 3s^a	104	66.1	83.3	74.6	74.7	3.4
Interpremolar distance^b	104	29.2	45.8	36.8	37.2	2.4
Intercanine distance^b	104	29.0	37.9	33.1	33.2	2.2
Intermolar distance^b	104	32.7	51.7	45.4	45.3	2.9
Intercanine-intermolar distance ratio	104	0.6	1.1	0.7	0.7	0.1
Arch depth^b	104	25.2	36.7	31.7	31.4	2.5
Mandible
Inf. ang. 1^a	104	107.6	172.4	137.2	138.0	12.4
Inf. ang. 2d^a	104	113.4	157.8	129.0	130.6	9.6
Inf. ang. 2s^a	104	103.9	152.4	130.8	130.5	8.1
Inf. ang. 3d^a	104	60.9	84.4	70.8	70.7	4.2
Inf. ang. 3s^a	104	59.5	78.4	69.5	69.9	3.3
Interpremolar distance^b	104	24.2	34.3	29.8	29.9	2.1
Intercanine distance^b	104	20.6	30.6	25.7	25.5	1.8
Intermolar distance^b	104	34.2	46.4	41.1	41.2	2.5
Intercanine-intermolar distance ratio	104	0.5	0.8	0.6	0.6	0.0
Arch depth^b	104	20.6	32.5	26.9	27.0	2.3