Intervention
SECONDARY
For the audiovisual group, participants watched four short videos upon delivery of the retainer (“Hold that smile—Why are retainers so important?’’, “Retainers keep your teeth from becoming crooked again”, and two additional illustrative videos on how to use and take care of the retainer)The primary outcome was to assess the impact of the intervention on the adherence to the wear time instructions of the Hawley retainer in comparison to the control group, on a full-time basis (22 h) over a period of 6 months. The secondary outcomes were: (1) assessment and comparison of gingival and periodontal health after 6 months between the two groups, and (2) patients’ experiences and satisfaction with retainer wear.