Progress in Orthodontics

Table 1 Variables and number of microimplants

From: Long-term evaluation of factors affecting removal torque of microimplants

Variables		Maxilla (n)	Mandible (n)
Total	703	409	294
Placement site	Anterior teeth	82	43
	Posterior teeth	327	221
	Retromolar	–	30
Sex	Male	131	92
Sex	Female	278	202
Age	< 20 years	85	46
	20–29 years	205	171
	≥ 30 years	119	77
Length of microimplant	6 mm	21	168
	7 mm	288	126
	8 mm	85	–
Diameter of microimplant	1.3 mm	366	130
	1.4 mm	20	126
	1.5 mm	10	31
Placement method	Self-drilling	352	129
Placement method	Pre-drilling	57	165

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