Predictability of orthodontic tooth movement with aligners: effect of treatment design

Progress in Orthodontics

Table 3 Multiple linear regression output. The primary outcome lack of correction (LC) and the exposure prescribed movement (PM) were normalized by means a logarithmic transformation

Predictor	Coefficient	Robust standard error	t	P > t	95% confidence interval
Prescribed movement (PM)^*	0.21	0.02	11.19	< 0.001	0.17 to 0.24
Movement^†
Inclination	0.37	0.03	10.92	< 0.001	0.30 to 0.44
Rotation	–0.13	0.04	–3.17	< 0.001	–0.20 to –0.05
Mesio-distal translation	–2.06	0.07	–31.09	< 0.001	–2.19 to –1.93
Vertical translation	–1.59	0.05	–33.53	< 0.001	–1.69 to –1.50
Bucco-lingual translation	–2.08	0.05	–41.91	< 0.001	–2.18 to –1.98
Teeth^‡
Maxillary lateral incisors	0.13	0.05	2.43	0.02	0.02 to –0.24
Maxillary canines	0.23	0.08	2.90	0.01	0.07 to 0.39
Maxillary premolars	0.19	0.07	2.89	0.01	0.06 to 0.32
Maxillary 1st molars	0.03	0.08	0.43	0.67	–0.12 to 0.19
Maxillary 2nd molars	0.29	0.08	3.70	< 0.001	0.13 to 0.44
Mandibular incisors	–0.14	0.06	–2.20	0.03	–0.27 to –0.01
Mandibular canines	0.08	0.08	1.04	0.30	–0.08 to 0.24
Mandibular premolars	0.29	0.07	4.32	< 0.001	0.16 to 0.43
Mandibular 1st molars	0.32	0.08	4.20	< 0.001	0.17 to 0.47
Mandibular 2nd molars	0.49	0.08	6.11	< 0.001	0.33 to 0.65
Attachment^§
Conventional	0.09	0.06	1.72	0.09	–0.02 to 0.20
Optimized	0.08	0.03	2.27	0.03	0.01 to 0.15
Frequency of aligner change^**
10 days	–0.09	0.07	–1.21	0.23	–0.23 to 0.06
14 days	–0.12	0.05	–2.24	0.03	–0.23 to –0.01
Constant	0.21	0.07	2.97	< 0.001	0.07 to 0.35

*The variable was normalized conducting a logarithmic transformation of the data
^†The reference category is angulation
^‡The reference category is maxillary central incisor
^§The reference category is absence of attachment
**The reference category is 7 days