Risk Factors of Composite Attachment Loss in Orthodontic Patients during Orthodontic Clear Aligner Therapy: A Prospective Study

Table 1

Univariate analyses of attachment loss rate (base on attachments).

Factors	No. of attachments	Attachments		Rate (%)	χ^2 value	value
		Lost	Retained
Arch					0.032	0.915
Maxillary	740	50	690	6.76
Mandibular	657	44	613	6.70
Side					0.006	1.000
Left	704	47	657	6.68
Right	693	47	646	6.78
Tooth position					24.472	0.0001
Incisor/canine	451	34	417	7.54
Premolar	598	20	578	3.34
Molar	348	40	308	11.49