Impact of chemical agents for surface treatments on microhardness and flexural strength of root dentin.

Abstract:

:This study assessed the cross-sectional Knoop microhardness and flexural strength of root dentin exposed to different surface treatments with chemical agents after biomechanical preparation. Root canals from human canines were biomechanically treated and divided into eight groups (n=10) to receive one of the following dentin treatments: I. Deionized water (control); II. 5.25% Sodium hypochlorite (NaOCl); III. NaOCl + 10% Sodium ascorbate (SA); IV. SA; V. 2% Chlorhexidine gel (CHX); VI. 37% Phosphoric acid gel (PA) + CHX; VII. PA; and VIII. PA + NaOCl. The roots were sectioned to obtain specimens that were evaluated for cross-sectional Knoop microhardness and flexural strength using a three-point bending test. ANOVA and Tukey's test were performed. The microhardness in the control group was significantly higher (p < 0.05) than in the groups exposed to chemical agents, which in turn were statistically similar (p > 0.05) to each other. Regarding flexural strength, PA+NaOCl provided statistical higher values than PA+CHX and CHX. However, there was no significant difference between the control group and those groups subjected to surface treatment (p > 0.05). Dentin microhardness was reduced after exposure to NaOCl, CHX, PA, SA and their associations and the flexural strength of radicular dentin was not affected by the chemical agents.

journal_name

Braz Oral Res

journal_title

Brazilian oral research

authors

Marcelino AP,Bruniera JF,Rached-Junior FA,Silva SR,Messias DC

doi

10.1590/1807-3107bor-2014.vol28.0052

subject

Has Abstract

pub_date

2014-01-01 00:00:00

eissn

1806-8324

issn

1807-3107

pii

S1806-83242014000100260

journal_volume

28

pub_type

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