scholarly journals Effect of immersion in various disinfectant solutions on the properties of a heat-cured acrylic resin

2019 ◽  
Vol 67 ◽  
Author(s):  
Cláudia Jiménez PEREIRA ◽  
Bruna GENARI ◽  
Vicente Castelo Branco LEITUNE ◽  
Fabrício Mezzomo COLLARES ◽  
Susana Maria Werner SAMUEL
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Medium Term ◽  
Domestic Use ◽  
Knoop Microhardness ◽  
Level Of Significance ◽  
Microhardness Tester

ABSTRACT Objective: The aim of the present study was to evaluate the influence, of immersion in different disinfectant solutions, on microhardness and surface roughness of a heat-cured acrylic resin. Methods: Specimens were immersed in distilled water, commercial vinegar for domestic use, sodium hypochlorite and hydrogen peroxide, for 150 hours or 300 hours (n=10). After periods of immersion, Knoop microhardness and surface roughness were evaluated using a microhardness tester and a roughness tester, respectively. The data were analyzed using two-way ANOVA and Holm-Sidak, at a level of significance of 5%. Results: The microhardness values ranged from 16.90 ± 0.33 to 17.80 ± 0.51 and roughness values from 0.05 ± 0.01 to 0.08 ± 0.02. There is no difference in microhardness and roughness between groups and times (p>0.05). Conclusion: Within the limitations of this study, it is possible to conclude that vinegar and hydrogen peroxide, as alternative disinfectant solutions for acrylic resin devices, did not promote deleterious effects on microhardness and polishing of a heat-cured acrylic resin used for the fabrication of prostheses, neither in the medium term nor the long term.

scholarly journals Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection

2015 ◽  
Vol 16 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Karin Hermana Neppelenbroek ◽  
Luciana Ayumi Kurokawa ◽  
Andréa Lemos Falcão Procópio ◽  
Thiago Amadei Pegoraro ◽  
Juliana Hotta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Posterior Teeth ◽  
Denture Teeth ◽  
Occlusal Surfaces ◽  
Artificial Teeth ◽  
Denture Cleansers ◽  
Chemical Disinfection

ABSTRACT Aim To evaluate the effect of successive cycles of disinfection in different denture cleansers on the surface roughness and the Vickers hardness of two layers of acrylic resin (base-BL and enamel-EL) of two commercial cross-linked artificial teeth. Materials and methods The occlusal surfaces of 60 acrylic resin denture posterior teeth (Trilux-TLX and SR Orthosit PE-SRO) embedded in autopolymerizing acrylic resin were ground flat with 1200-grit silicon carbide paper. Specimens were stored in distilled water at 37°C and then submitted to the microhardness (VHN) and roughness (ìm) tests. Specimens were stored in distilled water at 37°C for 90 days and submitted to 720 disinfection cycles in sodium hypochlorite at 0.5%, 30% vinegar solution or distilled water (control). Afterward, microhardness and roughness tests were again performed. Data were analyzed using two-way ANOVA and Tukey's test (α = 0.05). Results Hypochlorite immersion decreased the hardness of BL and EL of SRO teeth, with an average reduction of 10.11% (p < 0.008). TLX teeth demonstrated a hardness reduction of 28.96% of both layers for all solutions including water (p < 0.0000). The roughness of both teeth was not affected by denture cleansers (p > 0.37). Conclusion Hypochlorite promoted deleterious effects on the hardness of both layers of the artificial teeth tested. Immersion in vinegar and water also resulted in reduction of hardness of TLX teeth. Clinical significance The surface hardness of the different layers of cross-linked artificial teeth can be altered by daily disinfection in denture cleansers commonly indicated for removable dentures. How to cite this article Neppelenbroek KH, Kurokawa LA, Procópio ALF, Pegoraro TA, Hotta J, Lima JFM, Urban VM. Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection. J Contemp Dent Pract 2015;16(1):54-60.

scholarly journals Effect of Fluoride Gels on Microhardness and Surface Roughness of Bleached Enamel

2014 ◽  
Vol 8 (1) ◽  
pp. 188-193 ◽  
Author(s):  
Ana L.P China ◽  
Nayara M Souza ◽  
Yasmin do S. B. de L Gomes ◽  
Larissa D Alexandrino ◽  
Cecy M Silva
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Tooth Enamel ◽  
Distilled Water ◽  
Bleaching Agent ◽  
Fluoride Treatment ◽  
Before And After ◽  
Knoop Microhardness ◽  
Roughness Measurements

The effect of bleaching treatments containing added calcium and combined with neutral or acidic fluoride gels on tooth enamel was investigated in vitro through Knoop microhardness (KHN) and surface roughness (SR) measurements. A total of 60 bovine incisors were tested, including 30 for SR measurements and 30 for KHN measurements. The specimens were divided into 12 groups and subjected to a bleaching agent with hydrogen peroxide 35% (Whiteness HP 35% Maxx, FGM) or hydrogen peroxide 35% with calcium (Whiteness HP 35% Blue Calcium, FGM) and a fluoride treatment flugel acidulated phosphate fluoride (APF) or flugel neutral fluoride (NF). Control specimens were submitted to bleaching treatments without fluoride. Microhardness tests were performed using a Knoop indentor. Roughness measurements were obtained using a roughness analyzer. Measurements were obtained before and after treatment. The specimens were stored in distilled water at 37 °C between treatments. The results were analyzed using descriptive and inferential statistics. Treatments using APF combined with 35% HP caused a decrease in microhardness, while NF combined with HP 35% Ca increased the enamel hardness. Fluoride gels did not alter the SR of the bleached enamel.

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 Denture Base Cleansers on Surface Roughness of Heat Polymerised Acrylic Materials with Different Curing Process

2020 ◽  
pp. 281-289
Author(s):  
Kubra Degirmenci ◽  
Mustafa Hayati Atala ◽  
Canan Sabak
Keyword(s):  
Surface Roughness ◽  
Base Material ◽  
Chlorhexidine Gluconate ◽  
Distilled Water ◽  
Short Term ◽  
Denture Base ◽  
Cleaning Agents ◽  
Significant Difference ◽  
Post Hoc

Avoiding biofilm formation on dentures is associated with maintaining the surface properties of acrylic-based dentures. The aim of the study is to investigate the effects of two different cleaning agents (Corega and Klorhex 0.2% chlorhexidine gluconate) on surface roughness of the denture regarding efficacy of curing procedures. A total of sixty disc-shaped specimens were prepared with two different methods as long and short curing processes. The specimens were divided into subgroups according to the immersion solutions (distilled water, Corega tablet group and Klorhex 0.2% chlorhexidine gluconate group) (n=10). The samples were kept in a solution for 8 hours per day during a month. The average Ra1 (before exposure to the cleanser agent) and Ra2 (after exposure to the cleanser agent) of each sample was measured. A two-way ANOVA and post hoc Tukey test was used for statistical analysis. The solutions significantly increased the Ra values in both acrylic groups (p<0.001). While the effect of the distilled water group was significantly lower than Corega and Klorhex in the long-term curing group (p<0.05), no significant difference was found in the short-term curing group (p>0.05). The long-term curing time is highly effective in decreasing the surface roughness of the acrylic base material.

scholarly journals Effect of Different Dentifrices on the Surface Roughness of Acrylic Resins: An in vitro Study

2017 ◽  
Vol 18 (8) ◽  
pp. 679-682
Author(s):  
Nitin Gautam ◽  
Aditi Sharma ◽  
Unjum Bashir ◽  
Sisir Rapolu ◽  
Nallamilli Mamatha ◽  
...  
Keyword(s):  
Surface Roughness ◽  
In Vitro Study ◽  
Positive Association ◽  
Acrylic Resin ◽  
Control Group ◽  
Distilled Water ◽  
Acrylic Resins ◽  
Type Size ◽  
Utmost Care

ABSTRACT Aim This study was undertaken to study the effect of three most commonly used dentifrices for denture cleaning and to find out any positive association between number of strokes by toothbrush and surface roughness of acrylic resin. Materials and methods About 40 acrylic rectangular blocks with high finish were polished until surface roughness was calculated as 0 µm. The materials tested were distilled water as a control group, Patanjali Dant Kanti, Colgate Total Cream, and Cleansodent as dentifrices. Stroking was done with dentifrices, and surface roughness readings were recorded at 1,000, 9,000, and 18,000 strokes. Results Patanjali Dant Kanti was found to have maximum abrasive potential followed by Colgate Total Cream, followed by Cleansodent and least by distilled water. Conclusion Surface roughness was found to be directly proportional to the type, size, and fineness of the abrasive component used; the professional denture cleanser (Cleansodent) has less abrasive potential than the regular toothpastes. Among those tested, the highest abrasive potential was found in Patanjali Dant Kanti and lowest by Cleansodent (denture cleanser). Clinical significance The patient as well as dentist should choose the dentifrice with utmost care noting the size and type of abrasives used. Washing the dentures normally with water without toothbrush daily and cleaning of dentures once in 10 to 15 days with a soft toothbrush and professional denture cleanser should be the line of maintenance of dentures. How to cite this article Gautam N, Sharma A, Bashir U, Rapolu S, Mamatha N, Sravani S. Effect of Different Dentifrices on the Surface Roughness of Acrylic Resins: An in vitro Study. J Contemp Dent Pract 2017;18(8):679-682.

scholarly journals Pengaruh kopi Aceh ulee kareng terhadap kekerasan basis gigitiruan resin akrilik Effect of ulee kareng Aceh coffee the hardness of acrylic resin denture base

2011 ◽  
Vol 10 (3) ◽  
pp. 135
Author(s):  
Rini Defika Putri ◽  
Viona Diansari ◽  
Iin Sundari
Keyword(s):  
Surface Hardness ◽  
Acrylic Resin ◽  
Wilcoxon Test ◽  
Distilled Water ◽  
Denture Base ◽  
Robusta Coffee ◽  
Significant Difference ◽  
Before And After ◽  
Microhardness Tester

The hardness of denture base is influenced with the habit of most commonly consumed. Ulee Kareng Aceh coffeewas atype of robusta coffee which is acidic. The purpose of this study was to determine the change of surfacehardness of acrylic denture base after being immersed in ulee kareng coffee for 3 days. Twelve specimens (5 mmdiameter and 2 mm thickness)were randomly distributed in two groups: control (immersion in distilled water) andexperimental (immersion in Ulee Kareng Aceh coffee). Hardness was measured before and after immersion usingKnoop Microhardness tester (Shimadzu). Data were statistically analyzed by Mann Whitney and Wilcoxon test (α =0.05). The results of the study showed a significant difference between the groups P < 0.05. The surface hardness ofacrylic denture base decreased after immersion for both group P < 0.05.

scholarly journals Evaluation of surface roughness and color change of a light-cured and a heat-cured acrylic resin employed for fabrication of prosthetic bases after exposure to different types of disinfectants

2013 ◽  
Vol 1 (3) ◽  
pp. 199
Author(s):  
Adriana Maria Jorge Dal'acqua Silva ◽  
Joice González Guerrero ◽  
Luciana De Rezende Pinto ◽  
Ricardo Martins Carvalho ◽  
Vinicius Carvalho Porto
Keyword(s):  
Surface Roughness ◽  
Sodium Hypochlorite ◽  
Composite Resin ◽  
Color Change ◽  
Acrylic Resin ◽  
Deionized Water ◽  
The Other ◽  
Distilled Water ◽  
Tukey Test ◽  
Different Types

This study evaluated the changes in surface roughness and color of materials employed in the fabrication of prosthetic bases after immersion in disinfectants. Sixty specimens were fabricated using a round matrix; half of the specimens were fabricated with a heat-cured composite resin, and the other half with a light-cured composite resin. After polishing, the specimens were stored in distilled water at 37ºC from 48 to 52 hours, and then submitted to initial tests of surface roughness and color. The specimens were randomly divided into three groups and immersed in the following chemicals: G1 (1% sodium hypochlorite for 10 minutes), G2 (5.25% sodium hypochlorite for 5 minutes) and G3 (2% acidic glutaraldehyde for 10 minutes). The surface roughness and color tests were once again performed and the specimens were then stored in deionized water at 37ºC for 6 days. On the seventh day, the immersion was repeated; this procedure was performed at every 7 days during 1 month and the tests were repeated after the fourth week. The results were submitted to three-way analysis of variance (ANOVA) and to the Tukey test. Within the same groups of specimens, statistically significant differences were only observed for the light-cured resin, which presented slight changes after exposure to 5.25% sodium hypochlorite and 2% glutaraldehyde for the interval ΔE2, which indicates differences in reading values between immersion after 30-day storage and the first immersion in the disinfectants.

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 Avaliação de soluções antifúngicas de guanidina para resina base de dentadura: um estudo in vitro

2020 ◽  
Vol 61 (2) ◽  
pp. 39-49
Author(s):  
Maria Eduarda Rodrigues Gama ◽  
Vicente Castelo Branco Leitune ◽  
Isadora Martini Garcia ◽  
Stéfani Becker Rodrigues ◽  
Fabrício Mezzomo Collares
Keyword(s):  
Surface Roughness ◽  
Antifungal Activity ◽  
Flexural Strength ◽  
Guanidine Hydrochloride ◽  
Acrylic Resin ◽  
Control Group ◽  
Distilled Water ◽  
Acrylic Resins ◽  
Polyhexamethylene Guanidine

Background: The purposes of this study were: (1) to formulate polyhexamethylene guanidine hydrochloride (PHMGH) solutions at different concentrations; (2) to evaluate their antifungal activity against a mature biofilm of Candida albicans on acrylic resins; (3) to evaluate possible effects on acrylic resins flexural strength and surface roughness. Methods: PHMGH solutions were formulated with distilled water and 0.125, 0.250, or 0.5 wt.% of PHMGH. One group without PHMGH was used as control. For antifungal activity analysis, acrylic resin specimens were contaminated with C. albicans. Specimens were immersed in PHMGH solutions or distilled water for 5 or 10 min. Ultimate flexural strength and surface roughness of acrylic resins were evaluated. Results: All PHMGH solutions at 5 or 10 min showed antifungal activity compared to the control group (p

Bleaching optimization at WestRock mill in Covington, Virginia

TAPPI Journal ◽  
2016 ◽  
Vol 15 (9) ◽  
pp. 581-586 ◽  
Author(s):  
RICARDO B. SANTOS ◽  
PETER W. HART ◽  
DOUGLAS C. PRYKE ◽  
JOHN VANDERHEIDE
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Chlorine Dioxide ◽  
Capital Expenditures ◽  
Equipment Repair ◽  
Optimization Program ◽  
Hardwood Pulp ◽  
Improved Performance

The WestRock mill in Covington, VA, USA, initiated a long term diagnostic and optimization program for all three of its bleaching lines. Benchmarking studies were used to help identify optimization opportunities. Capital expenditures for mixing improvement, filtrate changes, equipment repair, other equipment changes, and species changes were outside the scope of this work. This focus of this paper is the B line, producing southern hardwood pulp in a D(EP)DD sequence at 88% GE brightness. The benchmarking study and optimization work identified the following opportunities for improved performance: nonoptimal addition of caustic and hydrogen peroxide to the (EP) stage, carryover of D0 filtrate to the (EP) stage, and carryover of (EP) filtrate to the D1 stage. As a result of actions the mill undertook to address these opportunities, D0 kappa factor decreased about 5%, sodium hydroxide consumption in the (EP) stage decreased about 35%, chlorine dioxide consumption in the D1 stage decreased about 25%, and overall bleaching cost decreased about 15%.

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