Effect of sodium hypochlorite and calcium hydroxide on fracture resistance of root dentin

Karine Padoin, Juliana Heckler Mello, Mariana de Carlo Bello, Carina Michelon, Renata Dornelles Morgental, Carlos Alexandre Souza Bier

Objective: The aim of this study was to assess the influence of different concentrations of sodium hypochlorite (NaOCl) solution and of calcium hydroxide [Ca(OH)2] paste on the strength of root dentin during endodontic treatment. Methods: Eighty roots of bovine mandibular incisors were randomly assigned to eight groups: C- Control (no intervention); PS- Physiological saline; 1% NaOCl; 5% NaOCl; PS/EDTA; PS/EDTA/Ca(OH)2; 1% NaOCl/EDTA/Ca(OH)2; and 5% NaOCl/EDTA/ Ca(OH)2. All groups were prepared with hand K files using the crown-down technique, except for the control group. The irrigating solution in each group was kept in the canal for 2 h, being replaced every 15 min. EDTA was applied for 3 min in the corresponding groups. Ca(OH)2 was kept in the root canals for 30 days. The specimens were subjected to compressive strength testing until fracture in an EMIC universal testing machine. The data were subjected to analysis of variance. The significance level was set as alpha = 0.05. Results: No statistically significant difference was found across the experimental groups (P>0.05). Conclusions: The use of NaOCl for 2h and Ca(OH)2 for 30days did not influence the strength of root dentin.

Keywords: Sodium hypochlorite. Calcium hydroxide. Endodontics. Root canal irrigants.

How to cite: Padoin K, Mello JH, Bello MC, Michelon C, Morgental RD, Bier CAS. Effect of sodium hypochlorite and calcium hydroxide on fracture resistance of root dentin. Dental Press Endod. 2019 Jan-Apr;9(1):31-6. DOI: https://doi.org/10.14436/2358-2545.9.1.031-036.oar

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