The predictability of orthodontic tooth movements through clear aligner among first-premolar extraction patients: a multivariate analysis

Progress in Orthodontics

Table 6 Linear regression analysis of multiple predictors for actual tooth movement for incisors

Variables	Extrusion		Lingual tipping		Retraction
Variables	β (95%CI)	p value	β (95%CI)	p value	β (95%CI)	p value
Age
Adolescent	0.24 (− 0.63, 1.12)	0.58	− 3.62 (− 7.49, 0.26)	0.07	− 0.96 (− 2.12, 0.20)	0.10
Adult	Referent		Referent		Referent
Gender
Female	0.22 (− 0.55, 0.99)	0.57	− 0.45 (− 4.08, 3.19)	0.81	− 0.36 (− 1.39, 0.67)	0.49
Male	Referent		Referent		Referent
Crowding	0.04 (− 0.04, 0.11)	0.32	− 0.47 (− 0.79, − 0.14)	0.006	− 0.02 (− 0.13, 0.08)	0.65
Mini-implant	0.25 (− 0.52 1.02)	0.52	1.49 (− 2.17, 5.15)	0.42	− 0.08 (− 1.13, 0.98)	0.89
Over bite	− 0.16 (− 0.42, 0.11)	0.24	− 0.57 (− 1.52, 0.38)	0.23	− 0.10 (− 0.36, 0.16)	0.45
Over jet	0.16 (0.02, 0.30)	0.03	0.43 (− 0.22, 1.09)	0.20	0.10 (− 0.09, 0.29)	0.31
Attachment	–	–	–	–
Power Ridge	− 0.45 (− 1.07, 0.18)	0.16	− 0.008 (− 3.37, 3.35)	0.19	− 0.26 (− 1.11, 0.59)	0.54
No*	Referent		Referent		Referent	–
Canine attachment
Optimal	0.94 (0.20, 1.68)	0.01	3.28 (− 0.14, 6.70)	0.06	0.78 (− 0.20, 1.77)	0.12
Vertical	Referent		Referent		Referent

Bold values indicate statistical significance (p < 0.05)
Result from the multiple linear regression analysis for actual tooth movement of central incisors
p value and 95% confidence interval (CI) ranges of the coefficient for each variable. The coefficient (β) presents the effect strength of the respective factor. p value below 0.05 was considered as statistical significance