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

Progress in Orthodontics

Table 6 Univariate and multivariate linear regression analyses for DPA of upper incisor intrusion

Variables	Univariate	Multivariate
Variables	P value	B (95%CI)	P value
Predicted intrusion	< 0.001**	0.556 (0.424, 0.688)	< 0.001**
Absolute value of crown-root angle	0.152*	0.013 (− 0.034, 0.060)	0.596
Labial surface-axis angle	0.307
Crown-root ratio	0.155*	− 0.632 (− 1.377, 0.113)	0.096
Height of labial alveolar bone	0.245
Height of palatal alveolar bone	0.228
Crown-root angle
Minus	0.303
Plus	Reference
Age
Adolescent	0.080*	− 0.077 (− 0.565, 0.412)	0.757
Adult	Reference
Gender
Male	0.249
Female	Reference
Tooth
Lateral incisor	0.113*	− 0.080 (− 0.380, 0.220)	0.597
Central incisor	Reference
Ipsilateral premolar extraction
Yes	0.299
No	Reference
Ipsilateral canine intrusion
Yes	0.002**	0.181 (− 0.105, 0.466)	0.212
No	Reference
Labial mini-implants
Yes	< 0.001**	− 1.466 (− 1.850, − 1.083)	< 0.001**
No	Reference
Class II elastics
Yes	0.460
No	Reference
Attachments on incisors
Power Ridge	0.295
Optimized attachment	0.891
None	Reference
Attachments on ipsilateral canines
Vertical rectangular attachment	0.079*	0.327 (− 0.123, 0.777)	0.153
Optimized attachment	0.098*	0.189 (− 0.296, 0.675)	0.442
Horizontal rectangular attachment	0.539	0.200 (− 0.307, 0.707)	0.436
None	Reference

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