A Study of Success Rate of Miniscrew Implants as Temporary Anchorage Devices in Singapore

Table 2

Success rate of miniscrew implants at T1.

	Success rate at T1 (%)	Number of 1st outcome successes/Total number	Unadjusted odds ratio (95% CI)	Unadjusted value	Adjusted odds ratio (95% CI)	Adjusted value
Overall success	94.7	270/285
Age at surgery				0.877		0.251
<20 years	94.6	193/204	0.91 (0.28 to 2.95)		2.31 (0.55 to 9.62)
≥20 years	95.1	77/81	1		1
Gender				0.502		0.288
Female	93.8	120/128	1		2.01 (0.55 to 7.31)
Male	95.5	150/157	1.43 (0.50 to 4.05)		1
Sagittal skeletal malocclusion				0.421
Class I	92.6	87/94	1
Class II	94.7	126/133	1.45 (0.43 to 4.82)	1
Class III	100	36/36	6.26 (0.22 to 177.92)	0.523
Vertical skeletal malocclusion				0.918		0.524
High angle	93.8	106/113	1		1
Average	95.1	97/102	1.28 (0.332 to 4.940)	1	2.12 (0.55 to 8.18)	0.276
Low angle	94.1	16/17	1.06 (0.09 to 12.50)	1	2.38 (0.19 to 29.38)	0.499
Dental malocclusion				0.361
Class I	96.5	55/57	1
Class II Div. I	93.4	155/166	0.61 (0.11 to 3.42)	1
Class III	100	41/41	3.74 (0.09 to 164.50)	0.554
Class II Div. 2	87.5	7/8	0.23 (0.01 to 3.55)	0.316
Side of placement				0.928
Left	94.9	129/136	1.07 (0.34 to 3.41)	1
Midline	100	4/4	0.56 (0.01 to 25.32)	1
Right	94.5	137/145	1
Recipient jaw				0.290		0.286
Maxilla	94.1	222/236	1		1
Mandible	98.0	48/49	3.03 (0.39 to 23.58)		3.40 (0.36 to 32.15)
Site of placement				0.647
Anterior region	93.3	14/15	0.36 (0.03 to 4.96)	1
Posterior region	93.4	169/181	0.50 (0.09 to 2.76)	1
Retromolar	100	20/20	1.52 (0.03 to 70.74)	1
Palate	97.1	67/69	1
Miniscrew implant type				0.606		0.887
AbsoAnchor	92.6	25/27	1		1
Vector TAS	94.9	244/257	1.50 (0.32 to 7.04)		1.14 (0.19 to 6.85)
Miniscrew length				0.001^*		0.002^*
6-7 mm	82.7	43/52	1		1
8 mm	97.3	177/182	7.41 (2.01 to 27.38)	0.001^*	11.88 (2.73 to 51.71)	0.001^*
10–12 mm	98.0	50/51	10.47 (0.94 to 116.31)	0.058	10.50 (1.18 to 93.51)	0.035
Miniscrew diameter				0.601
1.3 mm	92.9	26/28	0.30 (0.02 to 4.86)	0.658
1.4 mm	94.3	200/212	0.38 (0.04 to 4.02)	0.714
2.0 mm	97.8	44/45	1

≤ 0.05.