. 2022 Dec 1;48(1):e1. doi: 10.5395/rde.2023.48.e1

Table 1. Values of the dentinal penetration of sodium hypochlorite (μm) in groups with and without root canal preparation, after the final irrigation protocols.

Final irrigation protocol	With root canal preparation	Without root canal preparation
CNI	75.4 ± 36.5^a	102.1 ± 10.8^a
PUI	75.7 ± 32.3^a	95.1 ± 19.2^a
OC	79.4 ± 29.4^a	118.2 ± 17.1^b

Values are presented as mean ± standard deviation.

CNI, conventional needle irrigation; PUI, passive ultrasonic irrigation; OC, Odous Clean.

Different lowercase letters indicate statistically significant differences in columns.