Influence of orthodontic treatment with premolar extraction on the spatial position of maxillary third molars in adult patients: a retrospective cohort cone-bean computed tomography study

Table 3 Multiple regression analysis of maxillary third molar spatial position

	MB.cusp.to.sagit		MB cusp.to.front		MB.cusp.to.horiz		DB.cusp.to.sagit
	β	p	β	p	β	p	β	p
Before-after (after)	0.07	0.701	1.44	< 0.001^‡	−2.87	< 0.001^‡	0.69	0.006^†
Median line	−0.22	0.416	−0.06	0.89	0.25	0.753	−0.08	0.797
Anchorage (maximum)	0.5	0.615	1.38	0.373	0.75	0.801	0.18	0.874
Orthodontic appliance (fixed)	−0.28	0.799	0.41	0.805	4.03	0.212	−0.35	0.781
Tooth extraction (second premolar)	0.95	0.206	−0.85	0.459	−2.64	0.234	1.53	0.078
Crowding (moderate)	0.43	0.738	−2.27	0.259	2.42	0.531	−0.21	0.891
Crowding (severe)	−0.26	0.76	−0.84	0.53	1.73	0.502	−0.75	0.455
Malocclusion type (Class II)	−1.04	0.371	−1.29	0.473	3.77	0.276	−1.34	0.319
Malocclusion type (Class III)	−2.06	0.108	−0.57	0.77	4.21	0.267	−2.41	0.104

horiz horizontal plane, front frontal plane, sagit sagittal plane, MB mesial buccal, DB distal buccal
*p < 0.05; †p < 0.01; ‡p < 0.001