Postoperative quality of life following single-visit root canal treatment performed by rotary or reciprocating instrumentation: a randomized clinical trial.

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To compare the impact of rotary and reciprocating instrumentation on postoperative quality of life (POQoL) after single-visit primary root canal treatment. A randomized controlled clinical trial was designed and carried out in a University endodontic practice in northern Italy. Healthy subjects with asymptomatic irreversible pulpitis, symptomatic irreversible pulpitis or pulp necrosis with or without apical periodontitis (symptomatic or asymptomatic) scheduled for primary root canal treatment were enrolled. Single-visit root canal treatment was performed with ProTaper™ S1-S2-F1-F2 (rotary group, n=23) and WaveOne™ Primary (reciprocating group, n=24). Irrigation was performed with 5% NaOCl and 10% EDTA. Root canal filling was performed with the continuous-wave technique and ZOE sealer. POQoL indicators were evaluated for 7days post-treatment. The variation of each indicator over time was compared using anova for repeated measures (P<0.05). The impact of each variable on POQoL was analysed with a multivariate logistic regression model (P<0.05). Pain curves demonstrated a more favourable time-trend in the rotary group (mean, P=0.077; maximum, P=0.015). Difficulty in eating (P=0.017), in performing daily activities (P=0.023), in sleeping (P=0.021) and in social relations (P=0.077), was more evident in the reciprocating group. Patients' perception of the impact of treatment on POQoL was more favourable in the rotary group (P=0.006). Multirooted tooth type and pre-existing periradicular inflammation were associated with a decrease in POQoL. Reciprocating instrumentation affected POQoL to a greater extent than rotary instrumentation.