Abstract
The present study evaluated the amount of apically extruded debris after chemo-mechanical preparation (CMP) associated with passive ultrasonic irrigation (PUI) using four different root canal irrigants, namely, 6% sodium hypochlorite (NaOCl), 2% chlorhexidine gel + saline solution (2% CHXg+SS), 2% chlorhexidine solution (2% CHXs) and SS alone. Sixty mandibular premolars with single straight root canals were selected and randomly assigned into 4 groups (n=15) according to the root canal irrigant used as follows: G1 (PUI + NaOCl), G2 (PUI + CHXg+SS), G3 (PUI+CHXs) and G4 (PUI+SS). Reciproc® R25 files (25/.08) were used during CMP and the debris extruded from each tooth were collected in pre-weighted Eppendorf tubes and dried. The average weight of debris was assessed by using an analytical microbalance. Data were statistically analysed by using ANOVA and post-hoc Tukey's test (a=0.05). Debris extrusion was observed in all groups, irrespective of the root canal irrigating, with 2% CHXg + SS being associated with lower debris extrusion compared to other irrigants (p<0.05). No significant differences were observed between 6% NaOCl, 2% CHXs and SS. In conclusion, passive ultrasonic irrigation did not completely prevent apically extrusion of debris. PUI performed with 2% chlorhexidine gel + saline solution significantly minimized debris extrusion compared to 6% sodium hypochlorite, chlorhexidine solution and saline solution.
Highlights
Microbial reduction from root canals is of major relevance to achieve success in endodontic treatment
Debris extrusion was observed in all groups, irrespective of the root canal irrigant used during chemo-mechanical preparation (CMP)
The use of 2% CHXg + SS was associated with lower debris extrusion compared to their irrigants (p
Summary
Microbial reduction from root canals is of major relevance to achieve success in endodontic treatment. During the chemo-mechanical preparation (CMP), endodontic files and root canal irrigants are used to eliminate organic/inorganic tissues, which may harbor bacteria within the root canal system [1]. Organic and inorganic debris, bacteria and irrigants may extrude into the periapical tissues [2], resulting in severe pain [3]. Sodium hypochlorite (NaOCl) is the most used chemical substance during the root canal treatment [4]. The rheological action of CHXbased gel maintains the debris in suspension [5], and as a result it prevents apical extrusion of debris [6]
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