Abstract
Introduction: The sanitation of the canal system through irrigation/
aspiration, at the changing of the endodontic instruments aims to
the excised material, removal of microorganisms and the cleaning
of the walls of the canals. One of the substances used in endodontic
treatment of root canals, sodium hypochlorite, used at different
concentrations of active chlorine and pH, has gained popularity due
to its physical chemical properties. Objective: To analyze the active
chlorine content of sodium hypochlorite solution at 6.0%. Material
and methods: 80 samples were obtained from two litres of sodium
hypochlorite at 6%, obtained at every hour: one liter was stored at
room temperature and one liter at refrigerated environment, between
the morning and afternoon shifts, except on Saturday and Sunday.
The free residual chlorine was determined, using as variables: the
temperature, length of time in storage and the handling of the
substance in the Endodontic clinic for seven days. The data obtained
were submitted to analysis of variance according to the linear
regression model to test the effect of time of storage condition and
interaction between the main effects on the chlorine content of the stocked solution (p < 0.01). Results: The results showed that the sodium hypochlorite solution is quite unstable, with considerable
loss of active chlorine (58.33%), depending on the storage conditions
and storage time and temperature. The temperature interferes in the
free residual chlorine concentration contained in sodium hypochlorite
solution, that is, the higher the temperature, the lower the lifetime of
free residual chlorine in sodium hypochlorite solutions. Conclusion:
Storage in refrigerated environment proved to be the best option to
avoid the marked loss of active chlorine in sodium hypochlorite of
concentration at 6%.
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