Comparison between rapid and mixed maxillary expansion through an assessment of dento-skeletal effects on posteroanterior cephalometry

Progress in Orthodontics

Table 1 RME and MME activation and retention procedure

	Expansion				Retention	Total treatment duration
	Phases	Turns	Duration	Controls
RME group	One, rapid	2/day	1 to 3 weeks	4/months	8 months ± 2	1.2 year ± 0.3
MME	First, very rapid	4-2-1/day	1 h	2/months	8 months ± 2	1.3 year ± 0.2
MME	Second, slow	2/week	4 to 6 months	2/months	8 months ± 2	1.3 year ± 0.2