Effect of Foraminal Enlargement on Postoperative Pain in Necrotic Single-Rooted Teeth: A Randomized Clinical Trial.

INTRODUCTION: The aim of this study was to evaluate pain perception, pain medication intake, and sealer extrusion after single-visit root canal treatment of asymptomatic teeth with or without foraminal enlargement. The correlation between sealer extrusion and pain was also investigated. METHODS: One hundred forty necrotic, single-rooted teeth were divided into 2 groups (n = 70): foraminal patency (FP), in which treatment was performed up to 1 mm short of the apex, and foraminal enlargement (FE), in which treatment was performed up to the apex. The canals were instrumented using WaveOne Gold files (Dentsply Maillefer, Ballaigues, Switzerland), irrigated with 2.5% sodium hypochlorite, and filled using the single-cone technique and AH Plus sealer (Dentsply Maillefer). A visual analog scale was used to record pain 24, 48, and 72 hours and 1 week postoperatively. The presence or absence of sealer extrusion was recorded. RESULTS: Pain levels were significantly higher for FE than FP at 24 hours (P < .05), namely 0.3 +/- 0.9 versus 0.1 +/- 0.1; no difference was found at 48 hours, namely 0.1 +/- 0.5 versus 0.0 +/- 0.0 (P > .05). No pain was reported 72 hours or 1 week postoperatively in either group. Although all patients requiring pain medication at 24 hours were from the FE group, the difference between FE and FP was not statistically significant with respect to this variable (P > .05). Nevertheless, the intake amount was significantly higher in FE than in FP at this time point (P < .05). Sealer extrusion occurred more frequently in FE than FP, namely 57.14 % versus 14.29% (P < .05). There was no association between pain and sealer extrusion (P > .05) or between pain and sex, age, or tooth type (P > .05). CONCLUSION: FE was related to higher pain levels 24 hours postoperatively and to higher rates of filling material extrusion; however, there was no association between filling material extrusion and postoperative pain.