Jurič R, Vidmar G, Blagus R, Jan J. Factors associated with the outcome of root canal treatment-A cohort study conducted in a private practice. Int Endod J 2024; DOI: 10.1111/iej.14022.

Factors associated with success will be under the pre-, intra- and post-operative categories.

This cohort study investigated the association of various factors on root canal treatment outcome. Primary or secondary root canal treatment of mature permanent teeth was performed by a single endodontist in a private practice over 13 years and followed for 1-4 years. The proportion of successfully treated teeth and roots based on radiographic (periapical index (PAI) ≤2) and clinical criteria (absence of pain, swelling or sinus tract) was estimated; 1,259 teeth (2,445 roots, 3,149 canals) were assessed with a recall rate of 91%. The proportion of successfully treated teeth was 80%. Eleven prognostic factors were identified that significantly reduced the odds ratio for treatment success at tooth level. Six were preoperative: injury history, root PAI, lesion diameter, tooth type, tenderness to periapical palpation and two canals per root. Four factors were intraoperative: root filling of unsatisfactory quality or extending beyond or shorter than 2 mm from the apex, resin sealer and single visit treatment. One factor was postoperative: defective coronal restoration.