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 3 Paired t test for comparing the dental and skeletal changes after class II elastics phase for the mini-implant 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	82.78	3.00	− 1.12	2.50	0.72	− 1.55	0.14986	P > 0.05 NS
SNA	Post	81.67	3.42	− 1.12	2.50	0.72	− 1.55	0.14986	P > 0.05 NS
SNB	Pre	76.54	2.79	− 0.79	2.39	0.69	− 1.15	0.27516	P > 0.05 NS
SNB	Post	75.75	3.02	− 0.79	2.39	0.69	− 1.15	0.27516	P > 0.05 NS
ANB	Pre	6.20	1.47	− 0.37	0.79	0.23	− 1.62	0.13415	P > 0.05 NS
ANB	Post	5.83	1.11	− 0.37	0.79	0.23	− 1.62	0.13415	P > 0.05 NS
MMP	Pre	29.85	3.74	0.32	2.83	0.82	0.39	0.70541	P > 0.05 NS
MMP	Post	30.17	3.49	0.32	2.83	0.82	0.39	0.70541	P > 0.05 NS
MP/SN	Pre	38.68	4.67	0.37	2.13	0.62	0.60	0.56311	P > 0.05 NS
MP/SN	Post	39.04	4.50	0.37	2.13	0.62	0.60	0.56311	P > 0.05 NS
Y axis angle	Pre	56.85	3.35	2.15	1.32	0.38	5.62	0.00015	P < 0.001 HS
Y axis angle	Post	59.00	2.98	2.15	1.32	0.38	5.62	0.00015	P < 0.001 HS
Lower facial height	Pre	62.53	3.60	2.13	2.20	0.64	3.36	0.00637	P < 0.01 HS
Lower facial height	Post	64.67	4.64	2.13	2.20	0.64	3.36	0.00637	P < 0.01 HS
Effective maxillary length	Pre	84.13	4.57	0.70	3.00	0.87	0.81	0.43606	P > 0.05 NS
Effective maxillary length	Post	84.83	4.32	0.70	3.00	0.87	0.81	0.43606	P > 0.05 NS
Effective mandibular length	Pre	106.37	5.26	1.97	4.31	1.24	1.58	0.14184	P > 0.05 NS
Effective mandibular length	Post	108.33	5.65	1.97	4.31	1.24	1.58	0.14184	P > 0.05 NS
SN/occlusal plane	Pre	16.54	3.52	4.12	2.18	0.63	6.55	0.00004	P < 0.001 HS
SN/occlusal plane	Post	20.66	4.11	4.12	2.18	0.63	6.55	0.00004	P < 0.001 HS
U1 vertical position	Pre	20.73	2.89	1.06	2.31	0.67	1.59	0.14071	P > 0.05 NS
U1 vertical position	Post	21.79	1.95	1.06	2.31	0.67	1.59	0.14071	P > 0.05 NS
U1 AP position	Pre	13.18	3.00	− 4.35	2.99	0.86	− 5.04	0.00038	P < 0.001 HS
U1 AP position	Post	8.83	2.48	− 4.35	2.99	0.86	− 5.04	0.00038	P < 0.001 HS
U1 inclination	Pre	115.94	2.04	− 8.57	6.45	1.86	− 4.60	0.00076	P < 0.001 HS
U1 inclination	Post	107.38	5.48	− 8.57	6.45	1.86	− 4.60	0.00076	P < 0.001 HS
U6 AP position	Pre	44.17	6.10	− 3.29	6.38	1.84	− 1.79	0.10161	P > 0.05 NS
U6 AP position	Post	40.88	4.86	− 3.29	6.38	1.84	− 1.79	0.10161	P > 0.05 NS
U6 vertical position	Pre	15.13	2.11	0.58	0.91	0.26	2.22	0.04819	P < 0.05 S
U6 vertical position	Post	15.71	2.08	0.58	0.91	0.26	2.22	0.04819	P < 0.05 S
L1 inclination	Pre	99.88	4.80	4.45	1.47	0.42	10.52	0.00000	P < 0.001 HS
L1 inclination	Post	104.33	4.12	4.45	1.47	0.42	10.52	0.00000	P < 0.001 HS
L1 AP position	Pre	4.78	1.19	1.03	1.63	0.47	2.18	0.05173	P ≈ 0.05 Almost S
L1 AP position	Post	5.81	1.59	1.03	1.63	0.47	2.18	0.05173	P ≈ 0.05 Almost S
L1 vertical position	Pre	31.68	2.36	0.87	2.02	0.58	1.49	0.16480	P > 0.05 NS
L1 vertical position	Post	32.54	3.20	0.87	2.02	0.58	1.49	0.16480	P > 0.05 NS
L6 vertical	Pre	22.14	2.17	1.19	0.84	0.24	4.93	0.00045	P < 0.001 HS
L6 vertical	Post	23.33	1.83	1.19	0.84	0.24	4.93	0.00045	P < 0.001 HS
L6 AP position	Pre	42.18	4.47	2.98	3.82	1.10	2.71	0.02043	P < 0.05 S
L6 AP position	Post	45.17	3.69	2.98	3.82	1.10	2.71	0.02043	P < 0.05 S

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