Chemical analysis of the flocculate formed by the association of sodium hypochlorite and chlorhexidine

by M. A. Marchesan, Braulio Pasternak Júnior, Márcia Maisa de Freitas Afonso, M. D. Sousa-Neto, Cristina Paschoalato
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology ()


Objective: The association of chlorhexidine (CHX) and sodium hypochlorite (NaOCl) to enhance their chemical properties during root canal biomechanical preparation can lead to a brown flocculate being formed. Therefore, this study evaluated the metals present in their association by atomic absorption spectrophotometry, and evaluated a possible reagent that could dissolve the flocculate, allowing its clinical use. Study design: Five concentrations of CHX and NaOCl were mixed (2.5% NaOCl + 0.2% CHX, 2% CHX + 0.5% NaOCl, 2% CHX + 5% NaOCl, 0.2% CHX + 0.5% NaOCl, and 0.2% CHX + 5% NaOCl). Methanol and hexane, acetic acid, and vinegar were evaluated to dissolve the flocculate. Results: A flocculate was formed with all proportions and concentrations. Spectrophotometry analysis showed the presence of Ca, Fe, and Mg. Conclusion: It can be concluded that the association proposed led to the formation of brown flocculate regardless of concentration and proportion. © 2007 Mosby, Inc. All rights reserved.

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