Physicochemical and Pulp Tissue Dissolution Properties of Some Household Bleach Brands Compared with a Dental Sodium Hypochlorite Solution

By Jungbluth H, Peters P, Peters O, Sener B and Zehnder M PhD

Date: 10/2012
Journal: JOE

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.