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Evaluation of biofilm removal and adverse effects on acrylic resin by diluted concentrations of sodium hypochlorite and Ricinus communis solutions
Author(s) -
Arruda Caroli. F.,
Salles Marcela M.,
Badaró Maurício M.,
Sorgini Danilo B.,
Oliveira Viviane C.,
Macedo Ana P.,
SilvaLovato Cláudia H.,
Paranhos Helena F. O.
Publication year - 2018
Publication title -
gerodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 54
eISSN - 1741-2358
pISSN - 0734-0664
DOI - 10.1111/ger.12348
Subject(s) - sodium hypochlorite , medicine , acrylic resin , biofilm , flexural strength , sodium hexametaphosphate , nuclear chemistry , dentistry , composite material , sodium , materials science , chemistry , organic chemistry , biology , bacteria , genetics , coating , metallurgy
Purpose To verify whether 0.1% and 0.2% sodium hypochlorite (Na OC l), and 8% Ricinus communis ( RC ) were able to remove denture biofilm without causing deleterious effects to acrylic resin. Background Previous data show that denture cleansers are effective in reducing biofilm; however, they can change acrylic resin properties. Methods In a crossover trial, 47 denture wearers brushed and soaked their dentures (20 min/14 d): control, 0.85% saline; SH 1, 0.1% Na OC l; SH 2, 0.2% Na OC l and RC . Denture biofilm on the intaglio surface was stained, photographed and quantified (Image Tool ® ). Furthermore, 80 rectangular and 80 disc‐shaped specimens (Lucitone 550) were assigned into tested solutions (n = 20), simulating 5 years of daily short immersions (20 minutes). A colorimeter and the National Bureau of Standards units ( NBS ) determined colour data (ΔE). Surface roughness and flexural strength were measured using rugosimeter and universal testing machine, respectively. Data were compared by the Friedman test (α = .05) followed by Wilcoxon, corrected by Bonferroni (α = .005) (clinical) and Kruskal‐Wallis followed by the Dunn test (α = .05) (laboratorial). Results SH 2 ( MR =1.77) showed lower biofilm coverage; SH 1 ( MR = 2.37) and RC ( MR = 2.74) presented intermediated values. RC (1.10 [0.96:1.75]) revealed higher colour alteration than SH 1 (0.71 [0.62:0.80]) and SH 2 (0.74 [0.58:0.85]); however, NBS classified all solutions as “trace” (0.0‐0.5). There was no statistical significance for surface roughness ( P = .760) and flexural strength ( P = .547). Conclusions The 0.2% Na OC l showed the best clinical performance and did not cause adverse effects on acrylic resin on laboratory analyses.