Fig. 4From: Comparation of the effectiveness of conventional needle irrigation and photon-induced photoacoustic streaming with sodium hypochorite in the treatment of teeth with apical periodontitis: a randomized clinical trialThe incidence of percussion tenderness and fistula in the CNI and PIPS groups both pre-operatively and at 7-day follow-up. Abbreviations: CNI, conventional needle irrigation. PIPS, photon-induced photoacoustic streamingBack to article page