Distance to alveolar crestal bone: a critical factor in the success of orthodontic mini-implants

Progress in Orthodontics

Table 4 Multivariate logistic analysis showing associations between mini-implant success and explanatory variables (n = 260)

Associated variables	Coef.	Std. err.	95% CI	p value
	Failure (yes/no) ǂ
Constant	25.684	7.927	[10.148; 41.220]	0.001**
Age	− 0.345	0.139	[− 0.618; − 0.073]	0.013*
Gender (male)
Female	1.841	1.302	[− 0.710; 4.393]	0.157
Site (canine–premolar 1)
Premolar 1–premolar 2	− 6.180	2.804	[− 11.675; − 0.674]	0.028*
Premolar 2–molar 1	− 4.919	2.453	[− 9.728; − 0.110]	0.045*
Molar 1–molar 2	− 1.715	2.421	[− 6.461; 3.030]	0.479
Type (Imtek)
AbsoAnchor	− 2.303	1.493	[− 5.228; 0.623]	0.123
Jaw (maxilla)
Mandible	− 0.008	1.303	[− 2.563; 2.546]	0.995
Side (right)
Left	0.427	0.974	[− 1.481; 2.335]	0.661
DT	0.558	0.867	[− 1.141; 2.258]	0.519
DC	− 3.595	0.855	[− 5.270; − 1.919]	< 0.001**
Likelihood ratio χ²	146.45
Degrees of freedom	10
Prob > F	< 0.001**
Pseudo R²	0.8074

Age recorded in years; DT and DC recorded in mm
(Base) refers to the base outcome all other categories are compared to
Coef. regression coefficient, Std. err. standard error, DT distance to adjacent root, DC distance to alveolar crest level
^*Statistically significant at p < 0.05; ^**statistically significant at p < 0.01.