The influence of aligners on the activity of the masticatory muscles is still controversial, especially regarding the behavior associated with awake bruxism (AB).
To compare the frequency of AB behaviors between patients treated with aligners and fixed appliances.
The sample comprised 38 Class I patients (mean age 22.08 years), divided by simple randomization into two groups: OA group; orthodontic aligners (n 19) and FA group; fixed appliance (n 19). The frequency of AB was investigated by the ecological momentary assessment using an online device (mentimeter), during 7 following days at different timepoints, before and after appliance placement and in the 2 , 3 , 4 and 6 months of orthodontic treatment. These variables were also evaluated: level of anxiety by the State-Trait Anxiety Inventory, stress by the Perceived Stress Scale, catastrophizing related to pain and degree of hypervigilance by the Pain Vigilance and Awareness Questionnaire, and the presence of facial pain evaluated by the DC/TMD.
There was no difference between groups in the frequency of AB behaviors, with mean of 53.5% for group OA and 51.3% for FA. The most frequent behavior was slightly touching the teeth, and in FA group there was a significant reduction in this behavior soon after appliance placement. The groups did not differ concerning the degree of anxiety, stress, catastrophizing, hypervigilance and facial pain.
The orthodontic treatment performed with aligners or fixed appliances did not influence the frequency of AB during the 6 months of treatment.

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