Table 3 Data collection and study timeframe

1–2

14 orthodontic practices included

Collection of baseline data (photographs of 50 treated patients and baseline questionnaire)

3

Assignment to intervention or control arm

Information meeting

Dissemination of CPG and educational outreach visit 1 week later*

Professional questionnaire*

4–6

Start inclusion of patients with informed consent

10–12

Patient questionnaire

EPF registrations

10–15

Intra-oral photographs (6–9 months into treatment)

22–30

Registration of compliance in electronic patient files*

Intra-oral photographs

Professional questionnaire*