The efficiency of mandibular mini-implants in reducing adverse effects of class II elastics in adolescent female patients: a single blinded, randomized controlled trial

El-Dawlatly, Mostafa M.; Mabrouk, Mohamed A.; ElDakroury, Amr; Mostafa, Yehya A.

doi:10.1186/s40510-021-00368-2

Progress in Orthodontics

Table 2 Paired t test for comparing the dental and skeletal changes after class II elastics phase for the conventional group

From: The efficiency of mandibular mini-implants in reducing adverse effects of class II elastics in adolescent female patients: a single blinded, randomized controlled trial

Variable				Paired differences			t	P value
Variable		Mean	SD	Mean	SD	SEM	t	P value
SNA	Pre	82.08	2.97	− 0.33	2.23	0.64	− 0.52	0.61474	P > 0.05 NS
SNA	Post	81.75	3.19	− 0.33	2.23	0.64	− 0.52	0.61474	P > 0.05 NS
SNB	Pre	76.25	3.22	0.17	2.79	0.81	0.21	0.83988	P > 0.05 NS
SNB	Post	76.42	3.68	0.17	2.79	0.81	0.21	0.83988	P > 0.05 NS
ANB	Pre	5.83	1.11	− 0.50	1.57	0.45	− 1.11	0.29252	P > 0.05 NS
ANB	Post	5.33	1.72	− 0.50	1.57	0.45	− 1.11	0.29252	P > 0.05 NS
MMP	Pre	28.08	3.45	0.42	2.02	0.58	0.71	0.48993	P > 0.05 NS
MMP	Post	28.50	3.18	0.42	2.02	0.58	0.71	0.48993	P > 0.05 NS
MP/SN	Pre	36.08	4.58	1.38	2.23	0.64	2.14	0.05573	P ≈ 0.05 Almost S
MP/SN	Post	37.46	5.27	1.38	2.23	0.64	2.14	0.05573	P ≈ 0.05 Almost S
Y axis angle	Pre	57.20	3.70	2.30	4.67	1.35	5.62	0.00015	P < 0.001 HS
Y axis angle	Post	59.50	3.75	2.30	4.67	1.35	5.62	0.00015	P < 0.001 HS
Lower facial height	Pre	63.70	5.47	2.30	4.91	1.42	3.36	0.00637	P < 0.01 HS
Lower facial height	Post	66.00	4.47	2.30	4.91	1.42	3.36	0.00637	P < 0.01 HS
Effective maxillary length	Pre	83.17	4.20	0.75	5.28	1.52	0.49	0.63212	P > 0.05 NS
Effective maxillary length	Post	83.92	4.68	0.75	5.28	1.52	0.49	0.63212	P > 0.05 NS
Effective mandibular length	Pre	108.50	5.52	2.00	8.34	2.41	0.83	0.42406	P > 0.05 NS
Effective mandibular length	Post	110.50	6.08	2.00	8.34	2.41	0.83	0.42406	P > 0.05 NS
SN/occlusal plane	Pre	16.66	3.44	4.30	2.65	0.77	5.62	0.00016	P < 0.001 HS
SN/occlusal plane	Post	20.96	3.69	4.30	2.65	0.77	5.62	0.00016	P < 0.001 HS
U1 vertical position	Pre	20.92	3.17	1.67	3.39	0.98	1.70	0.11628	P > 0.05 NS
U1 vertical position	Post	22.58	2.81	1.67	3.39	0.98	1.70	0.11628	P > 0.05 NS
U1 AP position	Pre	7.30	3.06	− 0.30	3.82	1.10	− 0.27	0.79047	P > 0.05 NS
U1 AP position	Post	7.00	1.76	− 0.30	3.82	1.10	− 0.27	0.79047	P > 0.05 NS
U1 inclination	Pre	113.00	4.13	− 3.33	1.61	0.47	3.33	0.00002	P < 0.001 HS
U1 inclination	Post	109.67	4.42	− 3.33	1.61	0.47	3.33	0.00002	P < 0.001 HS
U6 AP position	Pre	42.17	2.92	− 2.04	5.91	1.71	2.04	0.25659	P > 0.05 NS
U6 AP position	Post	40.13	4.89	− 2.04	5.91	1.71	2.04	0.25659	P > 0.05 NS
U6 vertical position	Pre	16.33	2.53	0.08	2.16	0.62	0.13	0.89619	P > 0.05 NS
U6 vertical position	Post	16.42	1.94	0.08	2.16	0.62	0.13	0.89619	P > 0.05 NS
L1 inclination	Pre	100.00	6.09	5.42	2.81	0.81	6.68	0.00003	P < 0.001 HS
L1 inclination	Post	105.42	5.12	5.42	2.81	0.81	6.68	0.00003	P < 0.001 HS
L1 AP position	Pre	5.08	1.62	1.33	1.44	0.41	3.22	0.00819	P < 0.01 HS
L1 AP position	Post	6.42	1.62	1.33	1.44	0.41	3.22	0.00819	P < 0.01 HS
L1 vertical position	Pre	30.75	4.77	2.42	4.70	1.36	1.78	0.10243	P > 0.05 NS
L1 vertical position	Post	33.17	3.93	2.42	4.70	1.36	1.78	0.10243	P > 0.05 NS
L6 vertical	Pre	23.54	2.68	1.21	0.99	0.29	− 1.21	0.00139	P < 0.001 HS
L6 vertical	Post	24.75	2.83	1.21	0.99	0.29	− 1.21	0.00139	P < 0.001 HS
L6 AP position	Pre	42.08	3.23	0.92	6.35	1.83	0.50	0.62664	P > 0.05 NS
L6 AP position	Post	43.00	5.77	0.92	6.35	1.83	0.50	0.62664	P > 0.05 NS

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