Summary:
Purpose: to assess physicochemical properties of different brands of bleach and to investigate their ability to dissolve necrotic pulp tissue after the content of available chlorine was leveled.
Materials/Methods:
•6 different brands of household bleach and compared with Chlor- XTRA and technical NaOCl solutions (control)
•2 assessment series were carried out: 1st the products in their original formulation, 2nd the household bleach solutions were diluted to 1.0% NaOCl.
•The solutions were compared regarding their chlorine content (wt% NaOCl), pH, alkaline capacity, osmolarity, surface tension, and price.
•110 Bovine pulp tissue (n = 10 specimens per group) dissolution was assessed by test and control solutions adjusted to 1.0% NaOCl at 37C.
Most highlighted Results:
•The pH of undiluted solutions ranged between 11.1 and 12.7.
•Safeway Bleach Summit Fresh, had the highest pH and a higher alkaline capacity than other solutions
•Osmolarity was similar between products.
•The surface tension of Chlor-XTRA and Safeway Bleach Summit Fresh was about half that of the other solutions.
•Tissue dissolution was statistically similar among all solutions.
•Price was about 100-fold higher per liter of Chlor-XTRA compared with household bleach.
Clinical significance:
Other than its price, the Chlor-XTRA solution had no unique features. In contrast to an earlier report, reduced surface tension did not result in greater soft tissue dissolution by NaOCl.
