Effectiveness of clear aligners in achieving proclination and intrusion of incisors among Class II division 2 patients: a multivariate analysis

Progress in Orthodontics

Table 5 Univariate and multivariate linear regression analyses for DPA of upper incisor proclination

Variables	Univariate	Multivariate
Variables	P value	B (95%CI)	P value
Predicted proclination	< 0.001**	0.174 (0.087, 0.261)	< 0.001**
Absolute value of crown-root angle	0.406
Labial surface-axis angle	0.581
Crown-root ratio	0.414
Height of labial alveolar bone	0.777
Height of palatal alveolar bone	0.224
Crown-root angle
Minus	0.996
Plus	Reference
Age
Adolescent	0.005**	− 0.855 (− 2.952, 1.242)	0.421
Adult	Reference
Gender
Male	0.657
Female	Reference
Tooth
Lateral incisor	0.038**	− 1.051 (− 2.320, 0.218)	0.104
Central incisor	Reference
Ipsilateral premolar extraction
Yes	< 0.001**	2.773 (1.236, 4.311)	< 0.001**
No	Reference
Upper molar distalization
Yes	< 0.001**	− 2.085 (− 4.062, − 0.109)	0.039**
No	Reference
Separate anterior and posterior movement
Yes	0.045**	− 0.650 (− 2.541, 1.241)	0.498
No	Reference
Ipsilateral canine proclination
Yes	0.010**	1.811 (0.204, 3.419)	0.027**
No	Reference
Labial mini-implants
Yes	0.902
No	Reference
Class II elastics
Yes	0.631
No	Reference
Attachments on incisors
Power Ridge	0.039**	1.045 (− 0.873, 2.963)	0.283
Optimized attachment	0.495	0.883 (− 1.533, 3.299)	0.471
None	Reference
Attachments on ipsilateral canines
Vertical rectangular attachment	0.010**	0.862 (− 1.224, 2.948)	0.415
Optimized attachment	0.042**	0.491 (− 1.685, 2.667)	0.656
Horizontal rectangular attachment	0.467	0.127 (− 2.391, 2.645)	0.921
None	Reference

^*P < 0.2 indicated the variable could be included in multivariate analysis; **P < 0.05 indicated statistical significance