Progress in Orthodontics

Table 3 Dental cast analysis in RME and MME groups

From: Comparison between rapid and mixed maxillary expansion through an assessment of arch changes on dental casts

	Initial					Change after treatment				Final
	RME group		MME group			RME group		MME group		RME group		MME group
	T0		T0			T1–T0		T1–T0		T1		T1
Cast measure (mm)	Mean	SD	Mean	SD	p value	Mean	p value	Mean	p value	Mean	SD	Mean	SD	p value
Maxillary arch width
Intermolar	43.2	1.576	41.62	3.72	ns	8.8	***	8.7	***	52	2.40	50.31	5.30	ns
Inter second premolar	38.39	1.784	36.93	2.78	ns	7.28	***	6.9	***	45.67	2.15	43.83	4.52	ns
Inter first premolar	33.9	1.698	32.66	2.23	ns	6.82	***	7.33	***	40.72	2.47	40	4.40	ns
Intercanine	29.32	2.135	28.62	2.26	ns	4.3	***	3.70	***	33.62	1.55	32.33	2.12	*
Mandibular arch width
Intermolar	41.37	2.139	41.2	2.57	ns	1.5	*	2.09	**	42.87	2.35	43.29	2.62	ns
Inter second premolar	36.02	1.874	35.27	2.61	ns	1.17	*	2.36	**	37.2	1.69	37.63	2.79	ns
Inter first premolar	30.55	2.356	29.88	1.85	ns	0.8	ns	1.91	**	31.35	1.38	31.79	2.44	ns
Intercanine	24.9	1.382	24.45	1.50	ns	0.85	ns	1.13	*	25.75	1.58	25.59	1.68	ns
Maxillary arch depth	28.61	1.909	27.5	1.98	ns	−0.59	ns	−0.16	ns	28.02	2.80	27.34	2.18	ns
Mandibular arch depth	25.17	1.599	23.59	1.86	ns	0.3	ns	−0.59	ns	25.47	1.59	23	2.37	***

ns not significant
*p < 0.05; **p < 0.01; ***p < 0.001;

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