Abstract
Background: To assess the frequency of flare-ups and recognize the risk factors comprising age, initial diagnosis, number of root canals, tooth type, gender, the type of irrigation regimen, the number of visits and treatment modality, in patients who expected root canal treatment from May 2015 to May 2017.Materials and Methods: Records of 454 teeth belonging to 302 patients treated by endodontics expert throughout 2-year period were kept. Tooth, patient, and treatment characteristics were assessed and the relations between these characteristics and flare-ups were studied. Statistical analysis was carried out by using Chi-square test, regression analyses, and exact test. Results:The incidence of flare-ups was 16 (3.5 %) out of 454 teeth that had endodontic treatment. Pulpal necrosis without periapical pathosis was the most mutual symptom for flare-up (5.9 %) (P < 0.01). Teeth undergoing multiple visits had a higher risk of developing flare-ups compared to those with single appointments (OR: 3.27, CI: 1.21–6.91, p < 0.01). There were similarly no statistically significant differences in the frequency of flare-ups as regards to age, tooth type, gender, treatment modality, number of root canals, and the irrigation solutions that utilized amid the treatment. Conclusions:The frequency of flare-up is insignificant when teeth are treated in one visit. Absence of a periapical lesion in necrotic teeth is a significant factor for flare-ups.
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