Clinical outcome in periradicular surgery: effect of patient- and tooth-related factors--a multicenter study.

Objective: To evaluate the effect of patient- and tooth-related factors on the outcome of apical surgery in a multicenter study.

Method And Materials: A total of 281 teeth in 255 patients undergoing periradicular surgery were investigated clinically and radiographically 6 to 12 months postoperatively.

Results: The overall success rate was 88.