scholarly journals Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars

2012 ◽  
Vol 23 (6) ◽  
pp. 654-658 ◽  
Author(s):  
Danilo Zaparolli ◽  
Paulo César Saquy ◽  
Antonio Miranda Cruz-Filho
Keyword(s):  
Sodium Hypochlorite ◽  
Ethylenediaminetetraacetic Acid ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Water Control ◽  
Mandibular Molars ◽  
Significant Difference ◽  
Edta Solution ◽  
Maximum Decrease ◽  
Knoop Microhardness

The aim of this study was to evaluate the effect of irrigation regimens on dentin microhardness at the furcation area of mandibular molars, using sodium hypochlorite and ethylenediaminetetraacetic acid (EDTA), individually and in alternation. The occlusal surface and the roots of 20 non-carious extracted human permanent mandibular molars were cut transversally and discarded. The tooth blocks were embedded in acrylic resin and randomly assigned to 4 groups (n=5) according to the irrigating regimens: 1% NaOCl solution, 17% EDTA solution, 1% NaOCl and 17% EDTA and distilled water (control). Knoop microhardness of dentin at the furcation area was evaluated. Data were analyzed using one-way ANOVA and Tukey's multiple comparison tests (α=0.05). The results of this study indicated that all irrigation solutions, except for distilled water (control), decreased dentin microhardness. EDTA did not show a significant difference with NaOCl/EDTA (p>0.05), but showed a significant difference with NaOCl (p<0.01). EDTA and NaOCl/EDTA showed a maximum decrease in microhardness. The 17% EDTA solution, either alone or in combination with 1% NaOCl reduced significantly dentin microhardness at the furcation area of mandibular molars.

scholarly journals Effect of Aerated Drinks on Force Decay Properties of Elastomeric Chains: An In Vitro Study

2011 ◽  
Vol 1 (1) ◽  
pp. 20-23
Author(s):  
Reena R Kumar ◽  
Mayank Gahlot ◽  
Nameeta Kaur ◽  
Anil Miglani
Keyword(s):  
In Vitro Study ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Water Control ◽  
Orthodontic Space Closure ◽  
Force Decay ◽  
Space Closure ◽  
Significant Difference ◽  
Elastomeric Chains

Objective: To evaluate the effect of three commercially available aerated drinks on percentage of force decay of elastomeric chains used for orthodontic space closure. Materials & Method: Commercially available closed grey and clear elastomeric chains from two manufacturers were used in the study. The test solutions were distilled water (control), popular lemon based aerated drink, an orange based aerated drink and an aerated cola drink. Four acrylic resin jigs were constructed to provide a framework to simulate the distance between the permanent canine and first molar. The elastomeric chains were stretched and engaged between the two attachments. Jig I, II and III were immersed in the cola, orange and aerated lemon drink respectively for a period of two hours daily. Jig IV (control) was immersed in distilled water. Force levels were evaluated at the time intervals of 0 hours, 2 hrs, 12 hrs, 24 hrs, 3 days, 5 days and 7 days with a mechanical force gauge. Result: Force decay was statistically significant at T1 i.e. 2 hrs post immersion for all drinks compared. This decay was the highest for the elastomeric chains immersed in orange based drink followed by cola, lemon and the control. There was no significant difference between the two tested elastomeric chains. Conclusion: History recording should take cognizance of consumption of aerated drinks and their effect on orthodontic space closure.

scholarly journals An Assessment of Treated Greywater Reuse in Irrigation on Growth and Protein Content of Prosopis and Albizia

Horticulturae ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 38
Author(s):  
Naji K. Al-Mefleh ◽  
Yahia A. Othman ◽  
Maher J. Tadros ◽  
Amani Al-Assaf ◽  
Samer Talozi
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Dry Weight ◽  
World Health ◽  
Quality Analysis ◽  
Distilled Water ◽  
Albizia Lebbeck ◽  
Forage Production ◽  
Water Control ◽  
Significant Difference

This study investigated the influence of treated greywater on growth and protein content of multipurpose (forage and ornamental) transplants, Prosopis juliflora L., Prosopis tamarugo L., and Albizia lebbeck L. Transplants of tested species were irrigated with treated greywater, diluted greywater (grey + distilled water, 1:1/by volume), and distilled water (control) for seven months. Water quality analysis showed that the concentrations of nutrients and heavy metals found in the greywater were within the acceptable range compared with Jordan Institution for Standard and Metrology (JISM) and the World Health Organization (WHO) thresholds for safe use of greywater. Escherichia coli found in the greywater were lower compared to JISM and WHO guidelines for the safe use of greywater. Irrigation with treated greywater increased shoot fresh weight by 24–39% and dry weight by 34–40% compared to diluted greywater and control. No significant difference in crude protein was noticed between water treatments. Prosopis species (P. juliflora Albizia lebbeck L. and P. tamarugo Albizia lebbeck L.) had higher shoot fresh (35%) and dry weight the same species had lower crude protein (44%) when compared to Albizia lebbeck Albizia lebbeck L. The reuse of treated greywater for landscaping or forage production alleviates the demand for water resources and reduces the pressure on wastewater treatment plants. However, considering the controversial findings of previous studies on greywater quality (especially, long-term reuse), the reuse of treated greywater needs to be considered with caution and periodic quality analyses and economic assessments are required.

The Effect of Bleach Liquid and Household Cleaner on Surface Hardness and Roughness of Acrylic Base of Orthodontic Appliances

2021 ◽  
Author(s):  
Saeed Noorollahian ◽  
Farinaz Shirban ◽  
Vahid Mojiri
Keyword(s):  
Surface Roughness ◽  
Hydrochloric Acid ◽  
Sodium Hypochlorite ◽  
Surface Hardness ◽  
Acrylic Resin ◽  
Liquid Sodium ◽  
P Value ◽  
Orthodontic Appliances ◽  
Acrylic Resins ◽  
Significant Difference

Introduction: The daily use of orthodontic removable plates can interfere with the self-cleansing function of the mouth. Although various techniques have been proposed for cleaning removable orthodontic appliances, there is no consensus on the use of a safe method that preserves the physical properties of the appliance. This study aimed to investigate the effect of using hydrochloric acid (10%, for removal of mineral deposits) and sodium hypochlorite (5.25%, to remove organic matter and discolorations) on surface hardness and roughness of self-cure orthodontic acrylic resins. Materials & Methods: This cross-sectional laboratory study was conducted in the fall of 2017 at Isfahan University of Medical science and Isfahan University of Technology. In this study two orthodontic acrylic resins (Orthocryl® and Acropars®) were used. Eighty samples (12×10×3 mm) from each one were fabricated and divided into four groups (n = 20). Group 1: 15 minutes immersion in household cleaner liquid (Hydrochloric acid, 10%) followed by15 minutes immersion in household bleach liquid (Sodium Hypochlorite, 5.25%). In group 2, immersions were repeated just like group two times and in group 3, were done three times. Group 4 was as control and had no immersion. The surface hardness and roughness of samples were measured. Data were analyzed with Two Way ANOVA and the significance level was set at 0.05. Results: The number of immersion procedures did not significantly affect the surface hardness (p value = 0.958) and surface roughness (p value = 0.657) in the different study groups. There was no significant difference in the surface hardness between the two acrylic resin brands (p value = 0.077); however, Acropars acrylic resin samples exhibited significantly higher surface roughness compared to the Orthocryl acrylic resin samples(p value < 0.001). Conclusion: 15 minutes of immersion in 10% HCl, followed by 15 minutes of immersion in 5.25% NaOCl and repetition of the procedure three times did not significantly affect the surface hardness and roughness of self-cured acrylic resins.

scholarly journals Ekstrak bonggol nanas cayenne menghambat pertumbuhan Candida albicans pada plat resin akrilik heat curing Hump extract of cayenne pineapple inhibit the growth of Candida albicans on heat cured acrylic resin plate

2013 ◽  
Vol 12 (2) ◽  
pp. 86
Author(s):  
Prizka Brigitasari ◽  
Moh. Dharmautama
Keyword(s):  
Candida Albicans ◽  
Acrylic Resin ◽  
Negative Control ◽  
Distilled Water ◽  
Traditional Medicines ◽  
Heat Curing ◽  
Significant Difference ◽  
Protein Molecules ◽  
Complex Protein ◽  
The Media

Hump of pineapple is one of traditional medicines found in Indonesia, containing many enzyme bromelains that canparse complex protein molecules into simpler compounds. The enzyme bromelain can inhibit the growth of Candidaalbicans. The increasing of colonies of C.albicans could be due to the increased use of denture. This study shouldexplore effectiveness of hump concentration of cayenne pineapple against C.albicans growth at 30 heat curing acrylicresin plates sized 10 x 10 x 2 mm. The plates immersed in 10 ml of C.albicans and incubated for 24 hours at 37°C. Theplates were divided into 6 groups, subsequently 5 acrylic resin plates, which were soaked for 8 hours at roomtemperature in an hump extract of cayenne pineapple with the concentration of 5%, 15%, 25%, 35%, and 45%.Negative control was soaked in distilled water. 0.01 ml of a 10-3dilution and dropped into the media sabouraunddextrose agar (SDA), and then incubated for 48 hours at 37°C, and counted the number of C.albicans colonies. Analyzed with ANOVA and LSD test, it was known a significant difference of hump extract of cayenne pineapple 5%,15%, 25%, 35%, and 45% against C.albicans growth (p <0,05). On from this fact, it was concluded that hump extractof cayenne pineapple can inhibit the growth of C.albicans, which is effective at a concentration of at least 15%.

scholarly journals Avaliação da influência do polimento químico na sorpção, solubilidade e microdureza de uma resina acrílica de termopolimerização

2021 ◽  
Vol 41 (1) ◽  
pp. 8-13
Author(s):  
Susana Maria Werner Samuel ◽  
Catia Rubinstein Selistre
Keyword(s):  
Silica Gel ◽  
Clinical Performance ◽  
Sorption Property ◽  
Acrylic Resin ◽  
International Organization ◽  
Distilled Water ◽  
Constant Mass ◽  
Knoop Microhardness ◽  
The Difference ◽  
The Moment

The purpose of this study was to evaluate the influence of the chemical polishing, when compared to the mechanical polish, in the sorption, solubility and microhardness of a heat-polymerizable acrylic resin. The heatactivated acrylic resin used was Clássico (Art. Odontológicos Clássico Ltda., S.P.). The properties of sorption and the solubility were tested in accordance with International Organization for Standartization (ISO) specification n. 1567, making 20 samples in the format of disks, divided aleatory in two groups, where the first group received lhe mechanical polish with abrasive pastes, and the second, the chemical polish during IOS, in the chemical polisher PQ 9000 (série 4868-2, Termotron do Brasil Ltda., Piracicaba, SP). The samples were maintained in a desiccator with silica gel, at 37 DC, until the moment they reached constant mass (M1), obtained in a scale with resolution of 0,0001g. The samples were submerged in distilled water, at 37 Uc, for 7 days, when it was Obtained new mass value (M2). The difference between M1 and M2 divided by the volume Of each sample resulted in the sorption. The samples were desiccated again until they reach constant mass (M3). The difference between M1 and M3 divided by the volume of each sample resulted in the solubility Of the same ones. For the Knoop microhardness measurement, were made 20 specimens of acrylic resin, of which 10 samples received the mechanical polish and the others, the chemical polish. The Knoop microhardness test was made with a NU Research Microscope (VEB Carl Zeiss JENAGermany). The results indicated that the technique of the chemical polish is acceptable when considered the sorption property, even so unviable with the solubility property, in accordance with the specification n.1567 of ISO. The chemical polish also reduced significantly the superficial microhardness of the acrylic resin, which consequences can interfere in the clinical performance of the material.

scholarly journals Effect of different EGTA concentrations on dentin microhardness

2002 ◽  
Vol 13 (3) ◽  
pp. 188-190 ◽  
Author(s):  
Antonio Miranda da Cruz-Filho ◽  
Eduardo Augusto de Paula ◽  
Jesus Djalma Pécora ◽  
Manoel Damião de Sousa-Neto
Keyword(s):  
Acetic Acid ◽  
Statistical Analysis ◽  
High Speed ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Three Solutions ◽  
Human Teeth ◽  
Tukey Test ◽  
Significant Difference ◽  
Root Dentin

The effect of 1%, 3% and 5% EGTA (ethylene glycol-bis-(b-amino-ethyl ether) N,N,N´,N´-tetra-acetic acid) on the microhardness of root dentin of the cervical third of human teeth was studied. Five newly extracted maxillary incisors were sectioned transversely at the cementoenamel junction, and the crowns were discarded. The roots were embedded in blocks of high-speed polymerized acrylic resin and cut transversely into 1-mm sections. The second section of the cervical third of the root of each tooth was sectioned and divided into four parts. Each part was placed on an acrylic disc that was used as a base for microhardness measurement. Fifty microliters of 1% EGTA, 3% EGTA, or 5% EGTA were applied to the dentin surface. Deionized and distilled water was used as control. Dentin microhardness was then measured with a load of 50 g for 15 s. Statistical analysis showed that the three concentrations of the chelating solution EGTA significantly reduced dentin microhardness when compared with water (ANOVA, p<0.01), and that there was a statistically significant difference among the three solutions (Tukey test, p<0.05).

scholarly journals Chitosan: effect of a new chelating agent on the microhardness of root dentin

2012 ◽  
Vol 23 (3) ◽  
pp. 212-217 ◽  
Author(s):  
Josilaine Amaral Pimenta ◽  
Danilo Zaparolli ◽  
Jesus Djalma Pécora ◽  
Antonio Miranda Cruz-Filho
Keyword(s):  
Citric Acid ◽  
Chelating Agent ◽  
Acrylic Resin ◽  
Knoop Hardness ◽  
Distilled Water ◽  
Water Control ◽  
Three Solutions ◽  
All Solutions ◽  
Root Dentin ◽  
One Way Anova

The effect of solutions of 0.2% chitosan, 15% EDTA and 10% citric acid on the microhardness of root dentin was evaluated comparatively in this study. Thirteen sound human maxillary central incisors were selected and decoronated at the cementoenamel junction. Ten roots were set into rapid polymerization acrylic resin and the root/resin block was fitted to the cutting machine to obtain slices from the cervical third. The first slice was discarded and the second slice was divided into four quadrants. Each quadrant was used to construct a sample, so that 4 specimens were obtained from each root slice, being one for each chelating solution to be tested: 15% EDTA, 10% citric acid, 0.2% chitosan and distilled water (control). The specimens were exposed to 50 μL of the solution for 5 min, and then washed in distilled water. A microhardness tester (Knoop hardness) with a 10 g load was used for 15 s. Data were analyzed statistically by one-way ANOVA and Tukey-Kramer test (α=0.05). The other 3 roots had the canals instrumented and irrigated at the end of the biomechanical preparation with the test solutions, and then examined by scanning electron microscopy (SEM) for qualitative analysis. All solutions reduced the microhardness of root dentin in a way that was statistically similar to each other (p>0.05) but significantly different from the control (p>0.05). The SEM micrographs showed that the three solutions removed smear layer from the middle third of the root canal. In conclusion, 0.2% chitosan, 15% EDTA and 10% citric acid showed similar effects in reducing dentin microhardness.

scholarly journals Pós-colheita de hastes florais de cártamo colhidas em diferentes épocas e submetidas a diferentes soluções conservantes

2019 ◽  
Vol 25 (1) ◽  
pp. 87-96
Author(s):  
Janine Farias Menegaes ◽  
Henrique Fernando Lidório ◽  
Rogério Antonio Bellé ◽  
Sidinei José Lopes ◽  
Fernanda Alice Antonello Londero Backes ◽  
...  
Keyword(s):  
Sodium Hypochlorite ◽  
Carthamus Tinctorius ◽  
Experimental Unit ◽  
Distilled Water ◽  
Water Control ◽  
Post Harvest ◽  
Randomized Design ◽  
Beginning Of Flowering ◽  
In The Beginning ◽  
Preservative Solutions

The conservation of the cut flower stems aims to prolong durability, maintain the quality and reduce the losses after harvest, providing a greater period of lifespan and commercialization. Thus, the objective of this work was to evaluate the quality and durability in post-harvest of fresh safflower (Carthamus tinctorius L.) flower stems harvested in different times and submitted to different preservative solutions. The experiment was conducted in entirely randomized design and, organized in 4x8 (four preservative solutions and eight harvest seasons) factorial scheme, with four repetitions, and each experimental unit consisting of five floral stems. The cultivation of floral stems of safflower occurred at Floriculture Sector and the harvest seasons of them were carried out in the beginning of flowering from the sowing performed in the first seasonal half: in winter, spring and summer of 2016, autumn, winter, spring and summer of 2017 and autumn of 2018. And, the preservative solutions were: distilled water (control); distilled water + sucrose 2%; distilled water + sodium hypochlorite 2% and distilled water + sucrose 2% + sodium hypochlorite 2%. The floral stems were evaluated in relation to quality notes, dehydration and absorption of preservative solutions. We observed that the floral stems of safflower presented shelf life in average of nine days, with absorption of solution in average of 0.021 mL day-1 g-1 of fresh mass and that the use of preservatives was not beneficial to conservation in post-harvest.

scholarly journals Propagation studies in Smilax fluminensis Steud. (Smilacaceae)

2011 ◽  
Vol 41 (10) ◽  
pp. 1762-1768 ◽  
Author(s):  
Anielca Nascimento Soares ◽  
Ana Dionísia da Luz Coelho Novembre ◽  
Aline Redondo Martins ◽  
Sônia Maria de Stefano Piedade ◽  
Beatriz Appezzato-da-Glória
Keyword(s):  
Sixteenth Century ◽  
Sustainable Management ◽  
Dry Matter ◽  
Folk Medicine ◽  
Distilled Water ◽  
Stem Cuttings ◽  
Water Control ◽  
Significant Difference ◽  
C 30 ◽  
One Year

Smilax L. species, popularly known in Brazil as salsaparrilha, have been used in folk medicine as tonic against rheumatism and as anti-syphilitic since the sixteenth century; however, until today, their roots have been explored in an extractive way. The aim of this study was to analyze the propagation of Smilax fluminensis aiming to meet the demand and to propose procedures for its sustainable management. It was analyzed the percentage of seed germination, rooting of aerial and subterranean stem cuttings and plant resprouting capacity after removal of the shoots. The monitoring lasted one year. Seeds were subjected to temperatures: 25°C, 30°C, 20-30°C and 20-35°C under a daily photoperiod of eight hours and in the absence of light. For rooting the stem cuttings, aerial and subterranean stems about 20cm long with two nodal regions were subjected to treatment with distilled water (control) and indolbutyric acid (IBA) at 100ppm. The best germination percentages obtained for S. fluminensis were 80% at 20-30°C under light and 85% at 30°C in the dark. Only subterranean stem cuttings showed significant difference concerning fresh and dry matter of roots with higher values in treatments with hormone compared to the control.

scholarly journals Effect of Final Irrigation Protocol on Dentin Microhardness

2018 ◽  
Vol 11 (4) ◽  
pp. 2157-2162
Author(s):  
Farah Salahalden Abbas ◽  
Nadeen Jamal Abdulredah ◽  
Amer Salman Hassan
Keyword(s):  
Citric Acid ◽  
Hardness Test ◽  
Acrylic Resin ◽  
Acid Group ◽  
Distilled Water ◽  
Mean Values ◽  
Canal Irrigation ◽  
Significant Difference ◽  
Group A ◽  
Group B

Endodontic therapy is essentially a debridement procedure that requires the removal of the irritants of the canal and periapical tissue if success is to be gained. The debridement may include instrumentation of the canal, placement of medicament and irrigants. Complete cleaning of the root-canal system requires the use of irrigants that dissolve organic and inorganic material. The study aimed to evaluate changes in dentin microhardness after canal irrigation with different solutions. Twenty four freshly extracted human mandibular molars (distal roots with single canals) were used. 10mm root length was taken as standard length. The roots were embedded into auto polymerizing acrylic resin using plastic molds before the canals preparation and micro hardness test. The distal roots were prepared with one shape rotary file. Before the preparation each root was irrigated with 1ml distilled water. Then the roots were divided into four groups according to the final irrigation protocol: Group A: NaOCl 2.5%, Group B: EDTA 17%, Group C: Citric Acid 40%, Group D: Distilled Water. For (Vicker microhardness test) the same load and time 500 g test load for 20 seconds, will be conducted three times at distance 0.5mm from canal lumen ; thus there will be 9 indentations on each specimen surface. An average of the three readings for each test condition will be recorded as the VHN value of a specimen. Comparing all four groups statistically there was no significant difference among them. The mean values were found more reduced in EDTA group followed by NaOCL group, and then Control and Citric Acid groups. All the groups showed reduction in dentin microhardness. EDTA group showed the maximum reduction followed by NaOCL group, and least with Citric Acid group.

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