Table 2.

Mean Values and SD of Prescribed and Corrective Movements for Extrusion and Intrusion^a

	Tooth Type	Extrusion						Intrusion
		Number	Prescribed		Corrective		%	Number	Prescribed		Corrective		%
			Mean (mm)	SD (mm)	Mean (mm)	SD (mm)			Mean (mm)	SD (mm)	Mean (mm)	SD (mm)
Maxilla	Incisors	70	0.78	0.33	0.10	0.17	0.139	256	0.78	0.43	0.14	0.19	0.207
	Canines	30	0.62	0.32	0.06	0.15	0.124	79	0.70	0.36	0.07	0.14	0.143
	Premolars	9	0.42	0.11	0.01	0.03	0.022	19	0.47	0.29	0.01	0.02	0.013
	Molars	0	–	–	–	–	–	6	0.33	0.05	0.00	0.00	1,000
	All tooth types	109	0.71	0.33	0.08	0.16	0.125	360	0.74	0.41	0.11	0.18	0.179
Mandible	Incisors	17	0.56	0.17	0.05	0.11	0.080	323	0.82	0.42	0.19	0.22	0.295
	Canines	14	0.70	0.40	0.03	0.08	0.060	131	0.68	0.36	0.12	0.20	0.205
	Premolars	10	0.42	0.15	0.07	0.16	0.170	29	0.45	0.17	0.01	0.03	0.016
	Molars	0	–	–	–	–	–	6	0.45	0.32	0.00	0.00	1,000
	All tooth types	41	0.58	0.28	0.05	0.11	0.094	489	0.75	0.41	0.16	0.21	0.251
Total		150	0.67	0.33	0.07	0.15	0.117	849	0.75	0.41	0.14	0.2	0.220

^a% indicates mean percentage of overcorrection needed for each movement investigated.