Predicting Outcomes of Root Canal Treatment (PREDICT).

This prospective cohort study investigates risk factors for severe pain following root canal treatment (RCT), the prevalence and impact of persistent pain following RCT, and the impact of severe and persistent pain on health-related quality of life. Patient and treatment-related data are collected before and after RCT completion, and at 1 week, 6 months, and 12 months following RCT completion. The study included 172 practitioners from six National Dental PBRN regions and approximately 1,880 adult patients.

At the baseline enrollment visit, patients completed tablet-based enrollment, contact information, and two surveys (before and after treatment) at the baseline enrollment visit. 

Patient-reported follow-up data were collected by web-based or phone survey at 1 week, 6 months, and 12 months following the RCT completion visit date. 

Practitioners completed web-based weekly recruitment logs during the recruitment period, a before treatment survey at the enrollment visit, an after RCT completion survey on the obturation date (some patients required multiple visits), and uploaded pre- and post-RCT radiographs to a study site. 

Practitioners completed a 12-month survey and radiograph upload during a patient recal visit approximately one year after the RCT completion visit.