scholarly journals Effect of Nano-Filled Protective Coating and Different pH Enviroment on Wear Resistance of New Glass Hybrid Restorative Material

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 755
Author(s):  
Sandra Brkanović ◽  
Ana Ivanišević ◽  
Ivana Miletić ◽  
Dražen Mezdić ◽  
Silvana Jukić Krmek
Keyword(s):  
Wear Resistance ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
Storage Conditions ◽  
Low Ph ◽  
Distilled Water ◽  
Before And After ◽  
The Difference ◽  
Periodic Exposure

The purpose of the study was to determine the wear rate of Equia Forte HT Fil with Equia Forte Coat or without coating and compare it with Fuji IX GP high-viscosity glass ionomer cement (GIC) in conditions with acid load or at neutral pH. The samples were stored for 7 days: (1) in artificial saliva, (2) in artificial saliva and cyclically exposed to low pH, and (3) in distilled water and cyclically exposed to low pH. Wear was determined by measuring the difference in mass before and after brushing in an abrasion testing device. The wear of Fuji IX GP was significantly higher than that of Equia Forte HT Fil with or without coating (p = 0.000). The difference between Equia Forte HT Fil with and without Coat was not statistically significant (p < 0.803). The differences in wear resistance between samples stored in saliva and in distilled water were not significant (p = 0.588). Periodic exposure to the low pH solution significantly affected the wear resistance of all materials (p = 0.000). Equia Forte HT Fil was more resistant to wear than Fuji IX GP in all storage conditions. A resinous coat did not significantly increase wear resistance.

The tribocorrosion behaviors of Hastelloy C276 alloy in seawater

2014 ◽  
Vol 66 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Chen Jun ◽  
Yan Fengyuan ◽  
Wang Jianzhang
Keyword(s):  
Corrosion Current ◽  
Artificial Seawater ◽  
Wear Loss ◽  
Distilled Water ◽  
Friction Behavior ◽  
Content Type ◽  
Electrochemical Behaviors ◽  
Before And After ◽  
Aisi 316 Stainless Steel ◽  
The Difference

Purpose – The aim of this work is to study the tribocorrosion behaviors of Hastelloy C276 alloy sliding against AISI 316 stainless steel in artificial seawater and distilled water. Design/methodology/approach – The electrochemical behaviors of Hastelloy C276 alloy are measured by potentiodynamic polarization method. The tribocorrosion properties are evaluated using an MRH-03 type ring-on-block test rig in artificial seawater with different salinity. The wear loss is determined by the difference of sample weight before and after tribocorrosion tests. Findings – The results show that the typical passivation behavior is observed for C276 alloy in seawater. The Hastelloy C276 alloy has the maximum corrosion current density in 3 percent seawater, which is the synergism of salt concentration and dissolved oxygen in seawater. Friction coefficients are in general larger in distilled water compared with seawater. The wear loss in seawater is always higher than that in distilled water for both alloys. Seawater could reduce the friction coefficient and the wear resistance. Originality/value – Many scientists focused on studying the friction behavior of passive metals sliding against alumina or zirconia, which was considered to act as inert antagonist in the experiments. However, there are few papers available on the tribocorrosion properties of passive metals sliding each other in corrosion mediums.

scholarly journals Effect of acidulated phosphate fluoride application on microhardness of glass ionomer cement

2015 ◽  
Vol 27 (2) ◽  
Author(s):  
Mohammad Azrul Izzudin ◽  
Elin Karlina ◽  
Ratna Indriyanti
Keyword(s):  
Glass Ionomer Cement ◽  
Hardness Test ◽  
High Viscosity ◽  
Control Group ◽  
Distilled Water ◽  
Test Results ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Experimental Laboratory ◽  
And Control

Introduction: Acidulated phosphate fluoride (APF) gels are commonly used as preventive caries materials in paediatric dentistry while glass ionomer cements (GICs) are widely used as a restorative material. The purpose of this study was to determine the effect of acidulated phosphate fluoride application towards the microhardness of GIC. Methods: This study was an experimental laboratory study where ten specimens were prepared from high viscosity GIC, which was Fuji IX. Specimens were stored in 50 ml distilled water at first 24 hours at 37°C, and then specimens were divided into fluoride group which was immersed in 25 ml of 1.23 % APF gel and control group which was stored 25 ml distilled water for 24 hours at 37°C. The Micromet II Microhardness Tester, Buehler, IL, USA that was standardised for Vickers hardness test was used to test the specimens at 100-gram load. Data were analysed using the t-test comparison test. Results: The level of microhardness of the fluoride group (14.34) was much lower compared to the control group (43.21) with a highly significant difference (p<0.01). Conclusion: The application of 1.23% APF gel on high viscosity GIC reduces the microhardness level compared to the control group.

scholarly journals Evaluation of the water sorption of luting cements in different solutions

2018 ◽  
Vol 46 (2) ◽  
pp. 124
Author(s):  
Alma Gavranović-Glamoč ◽  
Muhamed Ajanović ◽  
Samra Korać ◽  
Selma Zukić ◽  
Sanela Strujić-Porović ◽  
...  
Keyword(s):  
Water Sorption ◽  
Ph Value ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Three Solutions ◽  
Resin Cements ◽  
Hydrophilic Matrix ◽  
Luting Cements ◽  
Resin Modified Glass Ionomer ◽  
Before And After

<div class="WordSection1"><p><strong>Objective. </strong>To evaluate and compare the water sorption of three luting cements in three different solutions: distilled water and artificial saliva with different pH values (7.4 and 3.0). <strong>Materials and methods</strong>. Resin-modified glass-ionomer cement (GC Fuji Plus) and two resin cements (Multilink Automix and Variolink II) were used. A total of 45 specimens - 15 specimens (15x1 mm) for each cement were prepared according to ISO standard 4049:2009. The water sorptions of the cements were calculated by weighing the specimens before and after immersion and desiccation. <strong>Results. </strong>Nonparametric statistic methods were applied. GC Fuji Plus cement showed significantly higher values of water sorption in all three solutions of both resin cements (p&lt;0.009) and significantly higher values of sorption in artificial saliva pH 3.0. Multilink Automix showed significantly higher values of water sorption compared with Variolink II in artificial saliva pH 7.4, and higher values of sorption in this solution compared with pH value 3.0. <strong>Con- clusion. </strong>Water sorption values are mainly influenced by the proportion of hydrophilic matrix, the type and composition of filler, and the pH value of solutions.</p></div>

scholarly journals Microleakage of high viscosity glass-ionomer and glass-carbomer with and without coating before and after hydrothermal aging

2019 ◽  
Vol 22 (1) ◽  
pp. Process ◽  
Author(s):  
Asli Patır Münevveroğlu ◽  
Alev Ozsoy ◽  
Beyza Ballı akgol ◽  
Ruhan Bozatlioglu ◽  
Pelin Korkut ◽  
...  
Keyword(s):  
Surface Coating ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
The Other ◽  
Blue Dye ◽  
Glass Ionomer ◽  
Hydrothermal Aging ◽  
Dye Penetration ◽  
Significant Difference ◽  
Before And After

Objective: The objective of this study was to evaluate the microleakage patterns of GIC and GGC with and without their protective surface coatings on enamel and dentin margins before and after aging. Material and Methods: Two rectangular cavities (height: 2 mm; width: 3 mm; depth: 1.5 mm) were prepared on each tooth at the cemento-enamel junction were prepared on human permanent molars (N=56) and the teeth were randomly assigned to be restored with one of the following: a) high viscosity glass-ionomer cement (GIC) (EQUIA Fil, C Corp., Tokyo, Japan) (n=28), b) glass-carbomer cement (GCC) (Glass Carbomer Products, Leiden, The Netherlands) (n=28). Half of the teeth were further divided into two groups where one group received protective surface coating (SC) (G-Coat Plus, GC Corp) (n=14) and the other group did not (n=14). Half of the teeth were stored for 24 hours (n=7), and the other half was thermocycled (5000 cycles, 5-55°C) (n=7). For microleakage analysis, the teeth were immersed in 5% methylene blue dye for 24 hours, sectioned into two equal halves. Microleakage patterns were evaluated using stereomicroscope and scored on a scale of 0-3 (0: No dye penetration, 1: Dye penetration less than half of the axial wall, 2: Dye penetration more than half the axial wall, 3: Dye penetration spreading along the axial wall). Data were analyzed using Kruskal-Wallis tests at the significance level of 0.05. Results: Compared to 24 h storage, after thermocycling, surface coating on GIC decreased microleakage significantly compared to GCC (p=0.046) but not for GCC. In the thermocycled groups, coated GIC showed significantly less leakage at the enamel margin but no significant difference was found with both GIC and GCC in the dentin margins. Conclusion: The application of surface coating significantly reduced the microleakage scores of GIC but not GCC, within the enamel margins only.KeywordsGlass-carbomer; Glass-ionomer; Microleakage.

scholarly journals Effect of Water-Based Disinfectants or Air-Drying on Dimensional Changes in a Thermoplastic Orthodontic Aligner

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7850
Author(s):  
Davide Bresolato ◽  
Andrea Volpato ◽  
Lorenzo Favero ◽  
Riccardo Favero
Keyword(s):  
Artificial Saliva ◽  
Storage Conditions ◽  
Distilled Water ◽  
Air Drying ◽  
3D Images ◽  
Degree Of Deformation ◽  
Dimensional Changes ◽  
Significant Difference ◽  
Dry Conditions ◽  
Oral Conditions

The polymer structure of thermoplastic materials currently used to make aligners is altered by the oral conditions and this negatively affects their capacity to move teeth. This study aimed to compare different options for storing aligners when not in use by superimposing successive 3D images to identify which storage method least affects material shape and weight. Fifty PET-G aligners, produced using the CA Digital method, were divided into four groups (1A, 1B, 1C, and 2D) and were stored for 18 h a day in artificial saliva at 37 °C. Then, to mimic their storage conditions when not in use, aligners in group 1A were immersed for the remaining 8 hours a day in bicarbonate solution, those in group 1B in chlorhexidine solution, those in group 1C in distilled water, and those in group 2D were stored dry. The samples were scanned at the baseline (before the immersion cycles began) and again two weeks later. The digital scans were superimposed and the median deformation, its variability, and weight differences were recorded for each group. Statistical analysis showed aligner deformation (expansion) in all three groups stored in wet conditions, with a statistically significant difference between groups 1A and 1C. Aligners in group 2D shrank slightly, and to a significantly greater degree with respect to group 1C. Variability in the degree of deformation was similar among the three groups stored in wet conditions, but significantly greater in group 2D. Weight gains were recorded in all four groups, the smallest in group 2D and the largest in group 1A. Storing aligners in dry conditions promoted lower deformation in the material, involving a slight shrinkage, whereas wet storage conditions caused an expansion of the aligner, especially when distilled water is used.

THE LIPIDE COMPOSITION DURING STORAGE OF HUMAN PLASMA, POOLED, IRRADIATED, AND DRIED

1953 ◽  
Vol 31 (1) ◽  
pp. 84-93
Author(s):  
Eldon M. Boyd
Keyword(s):  
Human Plasma ◽  
Free Cholesterol ◽  
Significant Loss ◽  
Red Cross ◽  
Distilled Water ◽  
Normal Human Plasma ◽  
Before And After ◽  
Blood Transfusion Service ◽  
Normal Human ◽  
The Difference

The purpose of this investigation was to determine the total lipide, neutral fat, total fatty acid, total cholesterol, ester cholesterol, free cholesterol, and phospholipide content, estimated by oxidative micromethods, of human plasma, pooled, irradiated, and dried, as collected by the Canadian Red Cross Blood Transfusion Service and processed at the Connaught Medical Research Laboratories. Determinations were made before and after storage as dried plasma for six months in the dark at temperatures of −40° C., 4° C., 20° C., and 40° C. All lipides present in this dry powdered plasma were found to be completely taken up in the distilled water used for its reconstitution to liquid plasma. The reconstituted liquid plasma contained approximately one-half the concentration of lipides present in fresh normal human plasma, the difference being due entirely to dilution during preparation and processing, except in the instances of both free and esterified cholesterol, of which approximately one-fifth the amount present in fresh normal human plasma was found to be missing in the final product. No statistically significant loss of lipides in dried plasma occurred after storage at −40° C., 4° C., or 20° C.; at 40° C. there was a statistically significant loss of approximately one-fifth of practically all lipides. Ultraviolet irradiation during processing did not affect the lipide composition of dried plasma determined before and after storage at 4° C.

scholarly journals Solubility of Two Resin Composites in Different Mouthrinses

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Sezin Ozer ◽  
Emine Sen Tunc ◽  
Nuray Tuloglu ◽  
Sule Bayrak
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Artificial Saliva ◽  
Resin Composites ◽  
Constant Mass ◽  
Composite Restorations ◽  
Before And After ◽  
The Difference ◽  
Post Hoc

Aim. This study aimed to compare the solubility of a universal restorative resin composite (Filtek Z250; FZ250) and a silorane-based resin composite (Filtek Silorane; FS) after immersion in alcohol-containing mouthrinse, alcohol-free mouthrinse, and artificial saliva.Methods. 30 discs (10 mm × 1 mm) were prepared from each material and desiccated until a constant mass was obtained. Specimens were immersed in the test solutions for two days and desiccated again. Solubility was calculated based on the change in weight of each specimen before and after immersion. Data was analyzed using two-way ANOVA and Tukey’s Post Hoc testP<0.05.Results. Solubility values for both resin composites were the highest in the alcohol-containing mouthrinse. FZ250 showed greater solubility than FS; the difference was only significant in artificial saliva.Conclusion. Both resin-composite materials tested exhibited some degree of solubility in each of the test solutions. The use of an alcohol-free mouthrinse may be preferable for patients with extensive composite restorations.

scholarly journals A Comparison Of Surface Roughness Values of Various Restorative Materials Immersed in Pedodontic Pre- and Probiotics

2021 ◽  
Vol 11 (6) ◽  
pp. 14389-14402
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
High Viscosity ◽  
Inorganic Filler ◽  
Glass Ionomer ◽  
Sem Images ◽  
Restorative Materials

The present in vitro study aims to evaluate pre- and probiotic liquids' effect on surface roughness values of restorative materials after one month of immersion. 360 disc-shaped samples (5mm x 2mm) were prepared from two types of glass-ionomer cements (GIC), a resin-modified GIC, a compomer, three bulk-fill composites, and one microhybrid composite. After the surfaces were polished, samples were divided into three groups (n = 15) and immersed for 10 minutes daily for one month in either a probiotic sachet, kefir (prebiotic), or artificial saliva. After that, the surface roughness values were measured by a profilometer. Scanning electron microscopy (SEM) evaluations of one sample from tested materials were also added. Statistical data were analyzed using one-way ANOVA and Bonferroni–Dunn tests. One of the GIC materials had significantly rougher surfaces in the probiotic sachet, followed by the compomer (p < 0.05). The compomer showed the roughest surfaces after immersion in kefir, followed by the microhybrid composite (Z250). Probiotic sachets formed rougher surfaces than kefir among samples. SEM images revealed the inorganic filler structures and microcracks on the surfaces. A high-viscosity glass-ionomer cement, Equia Fil Forte, and other composite-based materials tested in the present study can be used in pediatric patients who use pre- and probiotic supplements.

scholarly journals Evaluation of Solubility of Luting Cements in Different Solutions

2020 ◽  
Vol 49 (1) ◽  
pp. 57
Author(s):  
Alma Gavranović-Glamoč ◽  
Muhamed Ajanović ◽  
Lejla Kazazić ◽  
Sanela Strujić-Porović ◽  
Selma Zukić ◽  
...  
Keyword(s):  
Ph Value ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Three Solutions ◽  
Resin Cements ◽  
Luting Cements ◽  
Significant Difference ◽  
Before And After ◽  
Post Hoc ◽  
Nonparametric Statistical

<p><strong>Objective. </strong>To evaluate and compare the solubility of three luting cements in three different solutions: distilled water and artificial saliva with different pH values (7.4 and 3.0).</p><p><strong>Materials and Methods</strong>. Resin-modified glass-ionomer cement (GC Fuji Plus) and two resin cements (Multilink Automix and Variolink II) were used. A total of 45 specimens, 15 specimens (15x1 mm) for each cement, were prepared according to ISO standard 4049:2009. The solubility of the cements was calculated by weighing the specimens before and after immersion and desiccation. Values of solubility in water (Wsl) in microgram/mm3 for each of the five specimens were calculated using the following formula (ISO 4049:2009): Wsl=(m1-m3)∕V. The Mann-Whitney U nonparametric statistical method and Post hoc sample comparisons were applied.</p><p><strong>Results. </strong>GC Fuji Plus showed statistically significant higher solubility in comparison with Variolink II and Multilink Automix in all three solutions. In acidic artificial saliva (pH 3.0) Multilink Automix showed significantly higher values of solubility compared to Variolink II (P&lt;0.016). By studying the effect of pH value on the solubility of GC Fuji Plus cement, significantly higher values of solubility in pH 3.0 artificial saliva were confirmed (P&lt;0.009). The influence of the surrounding pH value on the solubility of the resin cements Multilink Automix and Variolink II was researched. No statistically significant difference was found.</p><p><strong>Conclusion. </strong>Solubility values were mainly influenced by the proportion of hydrophilic matrix, the type and composition of filler, and the pH value of the solutions.</p>

scholarly journals Bioactive Materials Subjected to Erosion/Abrasion and Their Influence on Dental Tissues

2020 ◽  
Vol 45 (3) ◽  
pp. E114-E123
Author(s):  
ÍEL Viana ◽  
Y Alania ◽  
S Feitosa ◽  
AB Borges ◽  
RR Braga ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Erosive Wear ◽  
Acrylic Resin ◽  
High Viscosity ◽  
Material Surface ◽  
Bioactive Materials ◽  
Dental Tissues ◽  
Significant Protective Effect ◽  
Ionomer Cement

SUMMARY Objective: The objective of this study was to evaluate the effect of erosion or erosion-abrasion on bioactive materials and adjacent enamel/dentin areas. Methods and Materials: Enamel and dentin blocks (4×4×2 mm) were embedded side by side in acrylic resin, and a standardized cavity (1.2×4×1.5 mm) was prepared between them. Preparations were restored with the following materials: composite resin (Filtek Z350, control); experimental composite containing di-calcium phosphate dihydrate particles (DCPD); Giomer (Beautifil II), high viscosity glass ionomer cement (GIC, Fuji IX); and a resin-modified GIC (Fuji II LC). The specimens were submitted to two cycling models (n=10): erosion or erosion-abrasion. The challenges consisted of five-minute immersion in 0.3% citric acid solution, followed by 60-minute exposure to artificial saliva. Toothbrushing was carried out twice daily, 30 minutes after the first and last exposures to acid. Dental and material surface loss (SL, in μm) were determined by optical profilometry. Data were analyzed with Kruskal-Wallis and Dunn tests (α=0.05). Results: Under erosion, for enamel, only the GIC groups presented lower SL values than Z350 (p&lt;0.001 for Fuji IX and p=0.018 for Fuji II LC). For dentin, none of the materials showed significantly lower SL values than Z350 (p&gt;0.05). For material, the GICs had significantly higher SL values than those of Z350 (p&lt;0.001 for Fuji IX and p=0.002 for Fuji II LC). Under erosion-abrasion, the enamel SL value was significantly lower around Fuji II LC compared with the other materials (p&lt;0.05). No significant differences were observed among groups for dentin SL (p=0.063). The GICs and Giomer showed higher SL values than Z350 (p&lt;0.001 for the GICs and p=0.041 for Giomer). Conclusion: Both GIC-based materials were susceptible to erosive wear; however, they promoted the lowest erosive loss of adjacent enamel. Against erosion-abrasion, only Fuji II LC was able to reduce enamel loss. For dentin, none of the materials exhibited a significant protective effect.

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