title: Dissolution of bovine pulp tissue in solutions consisting of varying NaOCl concentrations and combined with EDTA.
abstract: This in vitro study evaluated (1) the dissolution of bovine pulp tissue in solutions consisting of varying NaOCl concentrations and combined with EDTA; and (2) the pH of these solutions before and after the experiment. The independent variables were the concentration and the volume of the solution. Thirty bovine pulps were divided in equal fragments, resulting in 90 fragments of pulp tissue. Each fragment was immersed in one of the following solutions: 1% NaOCl (4 ml), 2.5% NaOCl (4 ml), 1% NaOCl + 17% EDTA (2 ml : 2 ml), 1% NaOCl + 17% EDTA (1 ml : 3 ml), 2.5% NaOCl + 17% EDTA (2 ml : 2 ml), and 2.5% NaOCl + 17% EDTA (1 ml : 3 ml). The test solutions were dichotomized as either able or not able to dissolve the tissue, the latter being attributed when the dissolution of the pulp tissue was not complete within 48 hours. When the samples were able to dissolve the tissue, the time required for complete tissue dissolution was submitted to statistical analysis. The pH of the solutions was measured before and after the experiment. The pH variable was dichotomized as either changed or unchanged. The results demonstrated that the NaOCl solutions combined with 17% EDTA were not able to dissolve the tissue. The t-test revealed that the 2.5% NaOCl solution presented a lower mean dissolution time than the 1% NaOCl solution (p < 0.001). The pH of the solutions with equal volumes of NaOCl and EDTA decreased in 48 hours.
authors.affiliation: School of Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil.
authors.forename: Luis Eduardo Duarte
authors.initials: LE
authors.lastname: Irala
authors.forename: Renata
authors.initials: R
authors.lastname: Grazziotin-Soares
authors.forename: Alexandre Azevedo
authors.initials: AA
authors.lastname: Salles
authors.forename: Aline Zen
authors.initials: AZ
authors.lastname: Munari
authors.forename: Joseani Santos
authors.initials: JS
authors.lastname: Pereira
mesh_terms: D000818:Animals; D002417:Cattle; D003782:Dental Pulp / Q000737:chemistry / Q000187:drug effects*; D004202:Disinfectants / Q000737:chemistry* / Q000494:pharmacology; D004492:Edetic Acid / Q000737:chemistry* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D012388:Root Canal Irrigants / Q000008:administration & dosage* / Q000494:pharmacology; D012973:Sodium Hypochlorite / Q000737:chemistry* / Q000494:pharmacology; D012996:Solutions; D013997:Time Factors
chemical_list: D004202:Disinfectants; D012388:Root Canal Irrigants; D012996:Solutions; D004492:Edetic Acid; D012973:Sodium Hypochlorite