A retrospective comparison of outcome of root canal treatment using two different protocols

Objectives. This retrospective study (1) compared the outcome of root canal treatment performed by an endodontist using 1 of 2 different protocols and (2) evaluated the influence of factors affecting outcome. Study design. A total of 200 teeth and 489 roots (Protocol A, 83 teeth/200 roots; Protocol 13, 117 teeth/289 roots) treated nonsurgically with root canal 4 to 5 years previously were examined clinically and radiographically according to strict criteria. Generalized estimating equations were used to perform logistic regression to analyze data. Results. The rate of complete healing for Protocol A (78%) was similar to that of Protocol B (76%). The pulpal status (odds ratio = 2.399, P = .040) and presence (odds ratio = 1.696, P = 0.015) and size (odds ratio = 0.823, P < .001) of periapical lesion were the only factors significantly affecting treatment outcome. Conclusion. The preoperative status of the pulp and the presence and extent of periapical periodontitis were important prognostic determinants of treatment outcome in this study.