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Mean percentage of canal surface coverage with residual collagen on the surface Opposite to the side port of needle after passive ultrasonic irrigation (B: Samples from the PUI group, 1-4 denote different canal dimensions [1 = size 20/0.04; 2 = size 20/0.08; 3 = size 40/0.04 and 4 = size 40/0.08), c: Coronal third of canal, m: Middle third of canal and a: Apical third of canal).
