Water and Physiological Saline to Prevent the Formation of P-Chloroaniline

María José Riquelme; Verónica Correa; Pilar Araya; Miguel Neira & Ismael Yévenes

Summary

This study determined if p-chloroaniline (PCA) can be minimized by using distilled water and physiological saline solution following sodium hypochlorite but before chlorhexidine. Hypochlorite 5%, 0.5%, 0.05%, 0.005% and 0.0005% dissolved in 0.9% NaCl and in distilled water were mixed with 2% chlorhexidine for the formation of PCA. The PCA was determined using UV-VISIBLE spectrometry, with spectral curve was determined the wavelength of maximum absorption of PCA. Formed PCA absorbance was measured between 0.025%, 0.02%, 0.015%, 0.01%, 0.005% and 0.0025% hypochlorite and 2% chlorhexidine. 2% chlorhexidine and hypochlorite with physiological saline form a white precipitate which prevents the measurement of PCA. Colored PCA is formed with 0.05%, 0.005% hypochlorite aqueous dilutions and 2% chlorhexidine. The lwavelength of maximum absorption obtained was 470 nm and absorbance of PCA showed a linear decrease. 0.005% NaClO produces the least amount of PCA. The best solvent to prevent the formation of PCA during the interaction of sodium hypochlorite with chlorhexidine is distilled water.

KEY WORDS: chlorhexidine; p-chloroaniline; distilled water; physiological saline solution; sodium hypochlorite.

How to cite this article

RIQUELME, M. J.; CORREA, V.; ARAYA, P.; NEIRA, M. & YÉVENES, I. Water and physiological saline to prevent the formation of p-chloroaniline. Int. J. Odontostomat., 9(3):399-404, 2015.