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

Progress in Orthodontics

Table 7 Univariate and multivariate linear regression analyses for DPA of upper incisor labial movement

Variables	Univariate	Multivariate
Variables	P value	B (95%CI)	P value
Predicted labial movement	< 0.001**	0.481 (0.410, 0.551)	< 0.001**
Absolute value of crown-root angle	0.002**	− 0.011 (− 0.059, 0.036)	0.640
Labial surface-axis angle	0.003**	− 0.015 (− 0.053, 0.024)	0.461
Crown-root ratio	0.280
Height of labial alveolar bone	0.027**	− 0.037 (− 0.097, 0.023)	0.222
Height of palatal alveolar bone	0.252
Crown-root angle
Minus	0.376
Plus	Reference
Age
Adolescent	0.060*	− 0.486 (− 0.957, − 0.015)	0.043**
Adult	Reference
Gender
Male	< 0.001**	0.011 (− 0.318, 0.339)	0.949
Female	Reference
Tooth
Lateral incisor	0.185*	0.178 (− 0.091, 0.447)	0.193
Central incisor	Reference
Ipsilateral premolar extraction
Yes	0.402
No	Reference
Upper molar distalization
Yes	0.002**	− 1.004 (− 1.265, − 0.743)	< 0.001**
No	Reference
Separate anterior and posterior movement
Yes	0.287
No	Reference
Ipsilateral canine proclination
Yes	0.838
No	Reference
Labial mini-implants
Yes	0.008**	− 0.738 (− 1.113, − 0.363)	< 0.001**
No	Reference
Class II elastics
Yes	0.357
No	Reference
Attachments on incisors
Power Ridge	0.667	0.180 (− 0.224, 0.584)	0.380
Optimized attachment	0.091*	0.398 (− 0.124, 0.920)	0.134
None	Reference
Attachments on ipsilateral canines
Vertical rectangular attachment	0.311
Optimized attachment	0.480
Horizontal rectangular attachment	0.209
None	Reference

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