Surface tension of calcium hydroxide associated with different substances

Estrela, Carlos; Estrela, Cyntia Rodrigues de Araújo; Guimarães, Luiz Fernando; Silva, Reginaldo Santana; Pécora, Jesus Djalma

doi:10.1590/s1678-77572005000200011

Cited by 22 publications

(8 citation statements)

References 9 publications

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“…At pH 12, the contact angle and  values for NaOCl decreased to 52.1⁰ and 74.10.5 mN/m whereas slight changes were noted in the contact angle and  values for NaOH at pH 12, 41.6⁰ and 72.60.5 mN/m respectively. The results of our study agree with the results ofEstrela et al (2005) andBeattie et al (2014) who obtained 75.0 mN/m for NaOCl and 72.8 mN/m for NaOH, at pH of 12 respectively.…”

supporting

confidence: 93%

“…The  value for pure water was 70.80.5 mN/m at 35 °C. In the current literature, the mean values for water surface tension at 25 °C range from 70.0 mN/m to 72.7 mN/m(Beattie et al, 2014;Estrela et al, 2005) agreeing with the value obtained in this study. It can be clearly seen that the addition of NaOCl and/or NaOH increased the  value of water (refer toTable 7.2).…”

supporting

confidence: 92%

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Fouling Indices for Quantification of Natural Organic Matter Fouling and Cleaning in Ceramic and Polymeric Membrane Systems

Alresheedi¹

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Polymeric membranes have emerged as an economically effective treatment option to produce drinking water. More recently, ceramic membranes are raising interest in this field due to their unique physical properties, which may prove to be important in moving towards more robust and sustainable drinking water treatment methods. However, the loss of membrane permeability as a result of natural organic matter (NOM) fouling remains one of the biggest challenges for sustainable polymeric and ceramic membranes operation. A key challenge in membrane system is to understand how operating pressure and water temperature may impact fouling and subsequent cleaning in relationship to NOM. Further there is limited data to ascertain if ultrafiltration (UF) polymeric and ceramic systems will respond in similar or different manners to NOM fouling which then further impacts how respective systems need to be cleaned.Fouling indices have been developed by means of simple, short, empirical filtration tests to assess the fouling potential of membrane feed water. The modified ultrafiltration fouling index (MFI-UF) is a standard test that is used to estimate a fouling index value that gives a general indication about the treatability of feed water or the need for pretreatment prior to a membrane unit. Unlike the MFI-UF, the unified membrane fouling index (UMFI) is used to quantify fouling a membrane is subjected to (i.e. reversible vs. irreversible), which provide different data on fouling. However, different approaches in fouling assessment may suggest that direct comparison lack context which lead to some disconnect between predicted and actual fouling in the field. Thus, the applicability of the MFI-UF to be effectively used in complement with the UMFI to predict NOM fouling under changes in iii filtration conditions needs to be examined with both ceramic and polymeric membranes systems.In addition, due to the superior chemical resistance of ceramic membranes, the utilization of high cleaning pH 12 solutions in a single, stepwise, or combined approach with sodium hypochlorite (NaOCl) and sodium hydroxide (NaOH) and ozone (O3) clean in place (CIP), which are not recommended with polymeric membranes, could highlight an advantage to ceramic membranes in drinking water applications for irreversible NOM fouling control.The research showed that all NOM types exhibited higher MFI-UF values, and therefore, higher fouling propensity as pressure increased from 1 to 3 bars and water temperature decreased from 35°C to 5°C indicating the effect of pressure and temperature on the MFI-UF fouling prediction. The NOM fouling potential order was consistent at different temperature which was the highest for the NOM mixture and proteins (BSA) followed by alginate and lastly humic acid. The MFI-UF normalization model was useful in estimating the fouling potential away from standard testing conditions (2 bar and 20°C). Therefore, MFI-UF values measured at standard testing conditions can be altered to actual filtration conditions by adjusting for the pressur...

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supporting

confidence: 93%

supporting

confidence: 92%

Fouling Indices for Quantification of Natural Organic Matter Fouling and Cleaning in Ceramic and Polymeric Membrane Systems

Alresheedi¹

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“…There is a great deal of disparity among the use of an optimum medium for Ca(OH) 2 that would aid in diminishing postoperative pain. According to Estrela et al, when calcium hydroxide distilled water (aqueous vehicle) paste was used, the liberation of Ca 2+ and OH - ions was faster and more significant, indicating their rapid action in reducing pain [ 19 38 ]. Another study by Gomes et al found that oily vehicles boost the antibacterial properties of Ca(OH) 2 against E. faecalis and other microorganisms, showing greater zones of microbial inhibition with oily vehicles than those with aqueous and viscous vehicles [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of vehicle for calcium hydroxide on postoperative pain: a scoping review

Aneja

Gupta

Abraham

et al. 2022

J Dent Anesth Pain Med

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This review aims to identify the influence of the vehicle and its concentration used to carry calcium hydroxide (Ca(OH) 2 ) medicament on postoperative pain. The protocol for this review was registered in the open science framework (Registration DOI- 10.17605/OSF.IO/4Y8A9 ) and followed the guidelines provided by the Joanna Briggs Institute. Reporting was based on the preferred reporting items for systematic reviews and meta-analyses extension for scoping reviews (PRISMA-ScR). Literature screening and searches were performed on PubMed/Medline, Scopus, and EBSCO hosts. Furthermore, additional records were manually analyzed using various sources. The selected studies were published in English and included the use of any vehicle adjunct to Ca(OH) 2 to evaluate postoperative pain using qualitative and quantitative pain assessment tools. Descriptive analysis was conducted to review the study design, vehicle elements, and their effects. A preliminary search yielded 7584 studies, of which 10 were included. According to the data collected, the most commonly used Ca(OH) 2 vehicles were chlorhexidine (CHX), normal saline, and camphorated paramonochlorophenol/glycerine (CPMC/glycerine), which had a significant effect on postoperative pain. Among the included studies, six evaluated the effect of CHX as a vehicle. It was observed that a higher concentration of the vehicle (2%) showed a favorable response in reducing postoperative pain. A majority of studies have validated a positive consequence of using a vehicle on postoperative pain. Although higher vehicle concentrations were found to alter postoperative pain levels, the data were insufficient to draw a firm conclusion. Our scoping review indicates that further clinical studies should focus on using different vehicles at various concentrations and application times to check for feasible and safe exposure in addition to providing pain relief.

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“…Solubility was assessed by means of the method described by Estrela et al, 15 following #57 ADA specification. Cements were mixed and compacted into ring molds, producing round specimens, 20 mm in diameter and 1.5 mm thick.…”

Section: Solubility Testmentioning

confidence: 99%

Effects of various additives on antimicrobial, physical and chemical properties of mineral trioxide aggregate (MTA)

Andrade¹,

Alcalde²,

GUIMARÃƒES³

et al. 2015

Dental Press Endod

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Objective: To assess the antimicrobial activity, solubility, setting time, flowability, pH, calcium release and surface characteristic of mineral trioxide aggregate (MTA) associated with different substances: 1% sodium hypochlorite gel, 2% chlorhexidine gel, K-Y gel, distilled water associated with 10% propylene glycol (CCPG), saline solution, and distilled water alone. Methods: The antimicrobial test included Streptococcus mutans, Lactobacillus casei, Enterococcus faecalis and Candida albicans, and the direct contact method was used. To assess setting time and flowability, ASTM 266/08 and ADA 57/2007 specifications were used. To assess pH and calcium release, the different types of material were inserted into retrograde cavities of acrylic resin teeth and immersed in ultrapure water for reading at different periods. The latter was performed with a pHmeter and an atomic absorption spectrophotometer. To assess the surface characteristics, acrylic teeth were analyzed under scanning electron micrograph (SEM). Results: The results yielded by the antimicrobial activity test revealed that additives associated with MTA were more inhibitory than bactericidal, with chlorhexidine achieving the best results. The K-Y vehicle made the additive more soluble than others. There were statistical differences amongst groups (p > 0.05) for flowability. The greatest setting time was observed in the CCPG group. The K-Y group presented the lowest pH and calcium release values in the 3-hour period. In the other periods, there was greater uniformity amongst groups. As regards the surface characteristics analysis, the CCPG group presented the greatest porosity (p < 0.05). Conclusions:Only the chlorhexidine gel brought some improvement to the antimicrobial effect, K-Y gel interfered in the physical-chemical properties of MTA and the addition of CCPG provided the greatest porosity.Keywords: Antimicrobial sensitivity test. Calcium release. Solubility. pH level. Physical-chemical properties. MTA.

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Surface tension of calcium hydroxide associated with different substances

Cited by 22 publications

References 9 publications

Fouling Indices for Quantification of Natural Organic Matter Fouling and Cleaning in Ceramic and Polymeric Membrane Systems

Fouling Indices for Quantification of Natural Organic Matter Fouling and Cleaning in Ceramic and Polymeric Membrane Systems

Influence of vehicle for calcium hydroxide on postoperative pain: a scoping review

Effects of various additives on antimicrobial, physical and chemical properties of mineral trioxide aggregate (MTA)

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