scholarly journals An evaluation of frequencies and types of bacterial pathogens in personnel gowns, before and after washing with sodium hypochlorite 5%, in Vali-e-Asr Hospital, Birjand, Iran

2019 ◽  
Vol 7 (3) ◽  
pp. 98-102
Keyword(s):  
Sodium Hypochlorite ◽  
Bacterial Pathogens ◽  
Before And After

scholarly journals Effect of repeated cycles of chemical disinfection in microhardness of acrylic resins of complete denture base

2017 ◽  
Vol 65 (3) ◽  
pp. 196-201
Author(s):  
Elisa das Graças MARTINS ◽  
Rafael Tobias MORETTI NETO
Keyword(s):  
Sodium Hypochlorite ◽  
Knoop Hardness ◽  
Sodium Hypochlorite Solution ◽  
Chlorhexidine Digluconate ◽  
Water Control ◽  
Denture Base ◽  
Acrylic Resins ◽  
Hardness Tests ◽  
Before And After ◽  
Edentulous Patients

ABSTRACT Objective: To evaluate the microhardness of specimens of acrylic resins VipiCril® (thermally polymerized resin) and Bosworth New Truliner® (self-polymerized resin), before and after immersion in solutions of 0.12% chlorhexidine digluconate, 1% sodium hypochlorite, Corega Tabs® and water (control), testing the null hypothesis that the mouthwashes and chemicals used to disinfect complete dentures do not interfere with the superficial microhardness, and can therefore be used as adjuncts to oral hygiene of edentulous patients. Methods: Sixty specimens of resin VipiCril®(thermally polymerized resin) and 60 specimens of resin Bosworth New Truliner® (self-polymerized resin) measuring 16 mm of diameter and 6 mm of height were prepared, which were randomly divided into four groups of 15 specimens each, undergoing Knoop hardness tests (KHN) both before and after cycles of immersion in solutions of 0.12% chlorhexidine digluconate, 1% sodium hypochlorite, Corega Tabs® and water (control). Results: The specimens of resins VipiCril and Bosworth immersed in solutions of 0.12% chlorhexidine, Corega Tabs® and water showed decreased microhardness. Conclusion: The 1% sodium hypochlorite solution caused least damage to the denture structure, not leading to decrease of the superficial microhardness.

Oxidation of Carboxymethyl Starch with Sodium Hypochlorite

1977 ◽  
Vol 47 (3) ◽  
pp. 209-211 ◽  
Author(s):  
I. Abd El-Thalouth ◽  
H. L. Hanna ◽  
A. Hebeish
Keyword(s):  
Sodium Hypochlorite ◽  
Reaction Temperature ◽  
Water Soluble ◽  
Shearing Stress ◽  
Carboxymethyl Starch ◽  
Before And After

Water-soluble carboxymethyl starch (CMS) was oxidized with sodium hypochlorite under different conditions. It was found that the rate of oxidation increases by increasing the hypochlorite concentration and/or reaction temperature. The viscosity of CMS before and after oxidation decreases as the shearing stress increases. Moreover, for a given shearing stress the viscosity decreases sharply by increasing the chlorine consumption.

Efficacy of Sodium Hypochlorite and Peroxyacetic Acid To Reduce Murine Norovirus 1, B40-8, Listeria monocytogenes, and Escherichia coli O157:H7 on Shredded Iceberg Lettuce and in Residual Wash Water

2009 ◽  
Vol 72 (5) ◽  
pp. 1047-1054 ◽  
Author(s):  
LEEN BAERT ◽  
ISABELLE VANDEKINDEREN ◽  
FRANK DEVLIEGHERE ◽  
ELS VAN COILLIE ◽  
JOHAN DEBEVERE ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Listeria Monocytogenes ◽  
Sodium Hypochlorite ◽  
Tap Water ◽  
Bacterial Pathogens ◽  
Wash Water ◽  
Escherichia Coli O157 ◽  
Murine Norovirus ◽  
Peroxyacetic Acid ◽  
Iceberg Lettuce

The efficiency of sodium hypochlorite (NaOCl) and peroxyacetic acid (PAA) to reduce murine norovirus 1 (MNV-1), a surrogate for human norovirus, and Bacteroides fragilis HSP40–infecting phage B40-8 on shredded iceberg lettuce was investigated. The levels of removal of viruses MNV-1 and B40-8 were compared with the reductions observed for bacterial pathogens Listeria monocytogenes and Escherichia coli O157:H7. Two inoculation levels, one with a high organic load and the other containing a 10-fold lower number of pathogens and organic matter, showed that the effectiveness of NaOClwas greatly influenced by the presence of organic material, which was not observed for PAA. Moreover, the present study showed that 200 mg/liter NaOCl or 250 mg/liter PAA is needed to obtain an additional reduction of 1 log (compared with tap water) of MNV-1 on shredded iceberg lettuce, whereas only 250 mg/liter PAA achieved this for bacterial pathogens. None of the treatments resulted in a supplementary 1-log PFU/g reduction of B40-8 compared with tap water. B40-8 could therefore be useful as an indicator of decontamination processes of shredded iceberg lettuce based on NaOCl or PAA. Neither MNV-1, B40-8, nor bacterial pathogens could be detected in residual wash water after shredded iceberg lettuce was treated with NaOCl and PAA, whereas considerable numbers of all these microorganisms were found in residual wash water consisting solely of tap water. This study illustrates the usefulness of PAA and NaOCl in preventing cross-contamination during the washing process rather than in causing a reduction of the number of pathogens present on lettuce.

Comparative characteristics of microflora root dentine at the use of different variants of medicamentous treatment of root canals

10.12737/4791 ◽  
2014 ◽  
Vol 8 (1) ◽  
pp. 1-4
Author(s):  
Беленова ◽  
I. Belenova ◽  
Красичкова ◽  
Olga Krasichkova
Keyword(s):  
Sodium Hypochlorite ◽  
Ultrasonic Treatment ◽  
Root Canal ◽  
Economic Effect ◽  
Scientific Data ◽  
Tooth Pulp ◽  
Root Canals ◽  
Antiseptic Treatment ◽  
Before And After ◽  
Abutment Teeth

Application of ultrasonic treatment combined with conventional methods of endodontic treatment contributes to reduce the cases of relapses and the time of treatment, and causes the highest economic effect. The proposed method allows to successfully treating chronic granulating periodontitis and to save the need for prosthetics abutment teeth. The purpose of this study is to increase the effectiveness of treatment of granulating periodontitis by optimizing antiseptic treatment of root canals by means of ultrasound. In a series of studies the material of the examination and treatment of patients in the therapeutic department «Lipetsk municipal dental polyclinic №2» was examined. The basis for receiving scientific data – contingent of 127 patients from 26 to 51 years with granulating form of chronic periodontitis, of these were 83 women and 44 men. Depending on the tactics of the treatment the patients were divided into two groups: the 1st group – 43 patients who were treated by the traditional method of treatment of periodontitis; the 2nd group – 84 persons were treated by means of ultrasound. Clinical examination of patients included visual diagnostics, sensing, thermometry, percussion, determination of conductivity of the tooth pulp, radiovisiographic and x-ray study. It is established, that after use of a 3% solution of sodium hypochlorite the changes are observed not qualitative composition of the microflora, but quantitative. The methods of ultrasonic treatment of chronic granulating periodontitis are developed. The ultrasound effect on the microflora of each root channel is conducted during 30 seconds with the frequency of 30 kHz. The structure of the dentin of the root canal with the help of scanning electronic microscopy, before and after the influence of ultrasound is studied and described. After exposure to 3% of sodium hypochlorite, activated by ultrasound, on the wall of the root canal by granulating periodontitis the growth of microorganisms didn’t revealed in 94,8% of cases.

scholarly journals Comparison of disinfection protocol of irreversible hydrocolloid (alginate) impressions through plastic and metallic trays

2014 ◽  
Vol 17 (3) ◽  
pp. 54 ◽  
Author(s):  
Luiz Kiyoaki Okazaki ◽  
Cidney Hiroaki Cato ◽  
Lúcia Teramoto ◽  
Anna Carolina Borges Pereira Costa ◽  
Marcelo Fava ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Sodium Hypochlorite ◽  
Cross Infection ◽  
Percentage Reduction ◽  
Effective Time ◽  
Colony Forming Unit ◽  
Tukey Test ◽  
Before And After ◽  
Irreversible Hydrocolloid ◽  
The Ideal

<p class="normal"><strong>Introduction</strong>: Many studies have evaluated the disinfection of irreversible hydrocolloid impressions through different disinfecting agents. However, impression trays can be source of cross-infection requiring disinfection. This study aimed to determine which would be the most suitable tray (metallic or plastic), available in dental market, and the ideal time to achieve disinfection by using 1% sodium hypochlorite poured into the alginate impression. <strong>Material and methods</strong>: Thirty dental impressions from the patients aged from 7-12 years and treated in the Discipline of Orthodontics of the institution were divided into two groups according to the impression tray type: 15 impressions through plastic tray (Morelli) and 15 impressions through metallic tray (Tecnodent). The material collection was performed before and after the application of 1% sodium hypochlorite for 3, 5 and 10 minutes. After the incubation period of 48 hours at 37ºC, the microorganism colonies were counted on the plates presenting from 30 to 300 colonies to determine the colony-forming unit (CFU) per mL. CFU/mL results were transformed into logarithm and submitted to statistical analysis by applying ANOVA and Tukey test (<em>p</em> ≤ 0.05). <strong>Results</strong>: Greater CFU percentage reduction occurred in alginate after three minutes, in both tray types. Concerning to tray types, it could be observed that the plastic tray showed 100% of reduction after 5 minutes while the metallic tray exhibited 81.49% of reduction after 3 minutes.<strong> Conclusion</strong>: 1 – The plastic tray showed the most effective disinfection after 5 minutes, with 100% of CFU reduction; 2 – The most effective time of disinfection with 1% sodium hypochlorite poured into the impression was 5 minutes, for both tray types.</p>

scholarly journals Evaluation of the efficiency of some disinfectants on the viability of Hymenolepis nana eggs isolated from wastewater and faecal sludge in Yaounde (Cameroon): importance of some abiotic variables

2021 ◽  
Author(s):  
Fotseu Kouam Arnold Landry ◽  
Ajeagah Gideon Aghaindum ◽  
Amoah Isaac Dennis ◽  
Okoa Amougou Thérèse Nadège ◽  
Tsomene Namekong Pierre
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hypochlorite ◽  
Optical Microscope ◽  
Parasitic Infections ◽  
Contributory Factor ◽  
Chemical Parameters ◽  
Hymenolepis Nana ◽  
Physico Chemical ◽  
Before And After ◽  
Set Up

Abstract Hymenolepis nana is responsible for many parasitic infections in tropical areas, with its persistence in aquatic environments as major contributory factor. A study aimed at demonstrating the effectiveness of some disinfectants on the viability of Hymenolepis nana eggs was conducted in microcosm. Sampling consisted of taking wastewater and sewage sludge samples in sterilized containers and then transporting to the laboratory of Hydrobiology and Environmental Sciences for the determination of Hymenolepis nana eggs using standard protocols. The experimental set-up consisted of five replicates, four tests and a control. The test samples were successively treated with four disinfectants (calcium chlorite, hydrogen peroxide, gypsum and sodium hypochlorite). The physico-chemical parameters were measured before and after disinfection. The samples were then observed under an optical microscope after concentration of the sample through sedimentation and McMaster technique. The viability of the eggs was determined using incubation and staining techniques. The analysis revealed that, the selected disinfectants significantly reduced the physico-chemical parameters with an average yield ranging from 79.24 ± 19.43% to 99.24 ± 1.47%). These physico-chemical parameters can significantly influence the treatment of Hymenolepis nana eggs either by absorbing the disinfectant or by constituting a protective barrier for the eggs, and the physico-chemical nature of the disinfectant strongly influences the formation of disinfection by-products. Calcium chlorite showed a greater effectiveness in reducing eggs viability with efficiency rates of 93.12 ± 9.12% followed by hydrogen peroxide (89.57 ± 14.55%), sodium hypochlorite (82.51 ± 14.39%) and gypsum (80.85 ± 12.88%). The results obtained with gypsum are almost similar to those obtained with other disinfectants (calcium chlorite, hydrogen peroxide and sodium hypochlorite) and clearly show that this disinfectant can be used in water treatment because, unlike other chemical disinfectants, it has no known toxic effects.

scholarly journals A New Weak Chelator in Endodontics: Effects of Different Irrigation Regimens with Etidronate on Root Dentin Microhardness

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Talita Tartari ◽  
Patrícia de Almeida Rodrigues Silva e Souza ◽  
Bruno Vila Nova de Almeida ◽  
José Otávio Carrera Silva Júnior ◽  
Oscar Facíola Pessoa ◽  
...  
Keyword(s):  
Citric Acid ◽  
Analysis Of Variance ◽  
Sodium Hypochlorite ◽  
Saline Solution ◽  
Acrylic Resin ◽  
Before And After ◽  
Root Dentin ◽  
Knoop Indenter

This study investigated the effect of sodium hypochlorite (NaOCl), ethylenediaminetetraacetic (EDTA), etidronic (HEBP), and citric acid (CA) associated in different irrigation regimens on root dentin microhardness. Forty-five root halves of single-rooted teeth were sectioned into thirds that were embedded in acrylic resin, polished, randomly assigned into 3 groups, and treated as follows: G1: saline solution; G2: 5% NaOCl + 18% HEBP, mixed in equal parts; and G3: 2.5% NaOCl. After measurements, the G3 samples were distributed into subgroups G4, G5, and G6, which were submitted to 17% EDTA, 10% CA and 9% HEBP, respectively. Following the new measurements, these groups received a final flush with 2.5% NaOCl, producing G7, G8, and G9. Microhardness was measured with Knoop indenter under a 25 g load for 15 seconds, before and after treatments. The data were statistically analyzed using paired Student’st-test (α<0.05) to compare values before and after treatments and analysis of variance (ANOVA) (α<0.05) to detect any differences among thirds. Except G1, all tested irrigation regimens significantly decreased the microhardness. There were no differences between root thirds before treatments, and all root thirds exhibited equal responses to same treatment. Except saline, all tested irrigation regimens reduced the root dentin microhardness.

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