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

Table 3

Success rate of miniscrew implants at T2.

	Success rate at T2 (%)	Number of 2nd outcome successes/Total number	Unadjusted odds ratio (95% CI)	Unadjusted value	Adjusted odds ratio (95% CI)	Adjusted value
Overall success	83.3	214/257
Age at surgery				0.082		0.270
<20 years	80.7	151/187	0.47 (0.20 to 1.10)		0.49 (0.14 to 1.73)
≥20 years	90.0	63/70	1		1
Gender				0.482		0.109
Female	81.4	92/113	1		1
Male	84.7	122/144	1.27 (0.66 to 2.44)		2.12 (0.85 to 5.31)
Sagittal skeletal malocclusion				0.025^*		0.487
Class I	89.5	77/86	1		1
Class II	83.5	101/121	0.59 (0.23 to 1.54)	0.438	0.88 (0.25 to 3.19)	0.852
Class III	68.6	24/35	0.26 (0.08 to 0.79)	0.014^*	0.25 (0.02 to 2.56)	0.240
Vertical skeletal malocclusion				0.028^*		0.043^*
High angle	79.6	82/103	1		1
Average	92.6	87/94	3.18 (1.13 to 8.98)	0.025^*	4.22 (1.35 to 13.16)	0.013^*
Low angle	75.0	12/16	0.77 (0.19 to 3.13)	1	2.20 (0.36 to 13.33)	0.391
Dental malocclusion				0.260		0.770
Class I	88.9	48/54	1		1
Class II Div. I	84.0	126/150	0.69 (0.22 to 2.16)	1	0.81 (0.18 to 3.70)	0.787
Class III	75.0	30/40	0.39 (0.03 to 2.66)	1	1.25 (0.09 to 17.71)	0.339
Class II Div. 2	71.4	5/7	0.30 (0.10 to 1.47)	1	0.22 (0.01 to 5.02)	0.868
Side of placement				0.590
Left	85.4	105/123	1.38 (0.65 to 2.93)	1
Midline	100	4/4	2.18 (0.05 to 94.33)	1
Right	80.8	105/130	1
Recipient jaw				0.081		0.065
Maxilla	81.4	175/215	1		1
Mandible	92.9	39/42	2.97 (0.87 to 10.10)		9.59 (0.87 to 105.86)
Site of placement				0.404
Anterior region	92.9	13/14	2.45 (0.18 to 33.59)	1
Posterior region	80.9	131/162	0.80 (0.31 to 2.07)	1
Retromolar	94.4	17/18	3.21 (0.24 to 43.06)	0.848
Palate	84.1	53/63	1
Miniscrew implant type				0.508		0.769
AbsoAnchor	78.3	18/23	1		1
Vector TAS	83.7	195/233	1.43 (0.50 to 4.07)		1.22 (0.33 to 4.53)
Miniscrew length				0.108		0.030^*
6-7 mm	76.7	33/43	1		1
8 mm	82.1	138/168	1.39 (0.55 to 3.52)	0.843	2.91 (0.93 to 9.13)	0.067
10–12 mm	93.5	43/46	4.34 (0.91 to 20.75)	0.071	17.95 (1.83 to 176.01)	0.013^*
Miniscrew diameter				0.122
1.3 mm	79.2	19/24	0.20 (0.03 to 1.41)	0.128
1.4 mm	81.2	156/192	0.22 (0.04 to 1.19)	0.089
2.0 mm	95.1	39/41	1

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