scholarly journals Influence of Ultrasonic Activation on the Physicochemical Properties of Calcium Silicate-Based Cements

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Fredson Márcio Acris De Carvalho ◽  
Yara Teresinha Corrêa Silva-Sousa ◽  
Carlos Eduardo Saraiva Miranda ◽  
Paulo Henrique Miller Calderon ◽  
Ana Flávia Simões Barbosa ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Cross Section ◽  
Calcium Ions ◽  
Calcium Release ◽  
External Surface ◽  
Setting Time ◽  
Dimensional Change ◽  
Sem Analysis ◽  
Ultrasonic Activation ◽  
Solubility Test

Purpose. To evaluate the influence of ultrasonic activation on the physicochemical properties of setting time (ST), flow (FL), dimensional change (DC), and solubility (SL) of the cements: MTA, MTA Repair HP, and Biodentine®. Materials and Methods. Two experimental groups were formed according to the cement activation protocol: without ultrasonic activation and with ultrasonic activation. Cements were manipulated according to the manufacturers’ instructions. Ultrasonic activation group was performed with an E1 insert at power 3 (24–32 kHz) for 30 s directly in the center of the cement mass. The molds for analysis of the physicochemical properties were filled out and evaluated according to specification No. 57 from ANSI/ADA. The results were analyzed using the ANOVA test (two-way), complemented by Tukey’s test (α = 0.05). The distilled water used during the solubility test was submitted to spectrometry to verify the release of calcium ions. The morphologies of the external surface and the cross-section of the samples were analyzed by means of a scanning electron microscope (SEM). Results. For the ST, ultrasonic activation reduced the values of MTA, MTA Repair HP, and Biodentine ( P < 0.05 ). For the FL, ultrasonic activation did not alter the flow of MTA ( P > 0.05 ); however, it increased the flow MTA Repair HP and Biodentine ( P < 0.05 ). For the DC, the percentage values of dimensional change were higher when there was ultrasonic activation in all repair cements ( P < 0.05 ). For SL, there was a reduction in the percentage of the values in MTA and MTA Repair HP ( P < 0.05 ); however, there was no change in the values of Biodentine ( P > 0.05 ). Ultrasonic activation favored the release of calcium ions from all cements. The SEM analysis showed, in general, that the ultrasonic activation reduced and altered the particle shape of the cement. Conclusions. The ultrasonic activation interfered in the ST, DC, FL, ultrastructural morphology, and calcium release of the repair cements. However, it did not affect the solubility of Biodentine®.

scholarly journals Evaluation of Physicochemical Properties of New Calcium Silicate-Based Sealer

2018 ◽  
Vol 29 (6) ◽  
pp. 536-540 ◽  
Author(s):  
Aline Teixeira Mendes ◽  
Paula Barcellos da Silva ◽  
Bruna Barcelos Só ◽  
Lina Naomi Hashizume ◽  
Rodrigo Ricci Vivan ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Calcium Ion ◽  
Calcium Silicate ◽  
Calcium Release ◽  
Setting Time ◽  
Porto Alegre ◽  
Ion Release ◽  
Ph Values ◽  
Time Flow ◽  
Ah Plus

Abstract This study aimed to evaluate the physicochemical properties of a calcium silicate-based sealer (Sealer Plus BC; MK Life, Porto Alegre, Brazil) compared with an epoxy-resin sealer (AH Plus; Dentsply DeTrey GmbH, Konstanz, Germany). Initial and final setting time was assessed based on ISO 6876:2012 and ASTM C266:03. Calcium ion release and pH were evaluated by filling polyethylene tubes with sealers and then immersing them in 10 mL of deionized water. Following experimental periods of 1, 24, 72 and 168 hours, the samples were measured regarding pH and calcium ion release with a pH meter and a colorimetric spectrophotometer, respectively. The flow was examined based on ISO 6876:2012. Rings of 10 mm in diameter with 1 mm thickness were prepared to analyze the radiopacity (ISO 6876:2012 and ADA n.57) and solubility (ISO 6876:2012). The data were analyzed by variance analysis, Student-T and Tukey tests (p<0.05). The calcium ion release and pH values were significantly higher for the Sealer Plus BC compared with the AH Plus (p<0.05). Lower setting time, flow and radiopacity were observed for the bioceramic sealer than for AH Plus (p<0.05). Sealer Plus BC exhibited higher solubility compared with AH Plus (p<0.05). Sealer Plus BC showed physicochemical properties as setting time, pH, calcium release, flow, and radiopacity following the required standards, but higher solubility than the minimum values required by ISO 6876:2012.

scholarly journals Evaluation of the Physicochemical Properties and Push- Out Bond Strength of Mta-based Root Canal Cement

2013 ◽  
Vol 14 (6) ◽  
pp. 1094-1099 ◽  
Author(s):  
Renato de Toledo Leonardo ◽  
Gisselle Moraima Chávez-Andrade ◽  
Milton Carlos Kuga ◽  
Marco Antonio Hungaro Duarte ◽  
Katia Cristina Keine ◽  
...  
Keyword(s):  
Bond Strength ◽  
Physicochemical Properties ◽  
Root Canal ◽  
Calcium Release ◽  
Setting Time ◽  
Significance Level ◽  
Setting Times ◽  
Ah Plus ◽  
Time Test ◽  
Push Out

ABSTRACT Aim This study investigated the flowability, setting time, pH, calcium release and bond strength of a MTA-based cement (MTA Fillapex®) compared to AH Plus and Sealapex. Materials and methods For the flowability test, the ISO 6876:2001 specification was utilized and for the setting time test, the ASTM C266-03 specification was utilized. For the pH and calcium release measurements, 10 samples were prepared for each group and analyzed for several different periods. For the push-out test, dentin disks were distributed into three groups, according to the cement utilized and into three subgroups, according to the root third (n = 10). After obturation, the specimens underwent push-out testing. The data were compared statistically using a significance level of 5%. Results The flowability of all materials was found to be similar (p > 0.05). The setting times were different among the groups tested (MTA Fillapex < Sealapex < AH Plus) (p < 0.05). At days 7 and 28, the MTA Fillapex presented the higher pH values (p < 0.05). At 24 hours and at 14 days, the calcium release of the MTA Fillapex was similar to that of Sealapex (p > 0.05). AH Plus presented the lowest pH and calcium release values (p < 0.05). In all root thirds, the adhesion to the dentin of the MTA Fillapex and Sealapex were significantly lower than that of AH Plus (p < 0.05). Conclusion MTA Fillapex and Sealapex presented several similar properties and both were found to be different than AH Plus. Clinical significance This study evaluated the physicochemical and mechanical properties of new MTA-based root canal cement, in order to use this scaler in root canal fillings. MTA Fillapex showed satisfactory properties for clinical use. How to cite this article Chávez-Andrade GM, Kuga MC, Duarte MAH, de Toledo Leonardo R, Keine KC, Anna-Junior AS, Só MVR. Evaluation of the Physicochemical Properties and Push-Out Bond Strength of Mta -based Root Canal Cement. J Contemp Dent Pract 2013;14(6):1094-1099.

A technique for preparing semiconductor cross sections for both TEM and SEM analysis

1989 ◽  
Vol 47 ◽  
pp. 712-713
Author(s):  
Stanley J. Klepeis ◽  
J.P. Benedict ◽  
R.M Anderson
Keyword(s):  
Sample Preparation ◽  
Cross Section ◽  
Cross Sections ◽  
Sem Analysis ◽  
Preparation Technique ◽  
Ion Milling ◽  
Tem Analysis ◽  
Polished Cross Section ◽  
Area Of Interest ◽  
Polished Side

The ability to prepare a cross-section of a specific semiconductor structure for both SEM and TEM analysis is vital in characterizing the smaller, more complex devices that are now being designed and manufactured. In the past, a unique sample was prepared for either SEM or TEM analysis of a structure. In choosing to do SEM, valuable and unique information was lost to TEM analysis. An alternative, the SEM examination of thinned TEM samples, was frequently made difficult by topographical artifacts introduced by mechanical polishing and lengthy ion-milling. Thus, the need to produce a TEM sample from a unique,cross-sectioned SEM sample has produced this sample preparation technique.The technique is divided into an SEM and a TEM sample preparation phase. The first four steps in the SEM phase: bulk reduction, cleaning, gluing and trimming produces a reinforced sample with the area of interest in the center of the sample. This sample is then mounted on a special SEM stud. The stud is inserted into an L-shaped holder and this holder is attached to the Klepeis polisher (see figs. 1 and 2). An SEM cross-section of the sample is then prepared by mechanically polishing the sample to the area of interest using the Klepeis polisher. The polished cross-section is cleaned and the SEM stud with the attached sample, is removed from the L-shaped holder. The stud is then inserted into the ion-miller and the sample is briefly milled (less than 2 minutes) on the polished side. The sample on the stud may then be carbon coated and placed in the SEM for analysis.

scholarly journals Enhancing the mechanical properties and cytocompatibility of magnesium potassium phosphate cement by incorporating oxygen-carboxymethyl chitosan

2020 ◽  
Author(s):  
Changtian Gong ◽  
Shuo Fang ◽  
Kezhou Xia ◽  
Jingteng Chen ◽  
Liangyu Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physicochemical Properties ◽  
Bone Cement ◽  
Ph Value ◽  
Setting Time ◽  
Potassium Phosphate ◽  
Carboxymethyl Chitosan ◽  
Bioactive Substances ◽  
Magnesium Potassium Phosphate Cement

Abstract Incorporating bioactive substances into synthetic bioceramic scaffolds is challenging. In this work, oxygen-carboxymethyl chitosan (O-CMC), a natural biopolymer that is nontoxic, biodegradable and biocompatible, was introduced into magnesium potassium phosphate cement (K-struvite) to enhance its mechanical properties and cytocompatibility. This study aimed to develop O-CMC/magnesium potassium phosphate composite bone cement (OMPC), thereby combining the optimum bioactivity of O-CMC with the extraordinary self-setting properties and mechanical intensity of the K-struvite. Our results indicated that O-CMC incorporation increased the compressive strength and setting time of K-struvite and decreased its porosity and pH value. Furthermore, OMPC scaffolds remarkably improved the proliferation, adhesion and osteogenesis related differentiation of MC3T3-E1 cells. Therefore, O-CMC introduced suitable physicochemical properties to K-struvite and enhanced its cytocompatibility for use in bone regeneration.

Effects of the addition of nanoparticulate calcium carbonate on setting time, dimensional change, compressive strength, solubility and pH of MTA

2016 ◽  
Vol 50 (1) ◽  
pp. 97-105 ◽  
Author(s):  
A. Bernardi ◽  
E. A. Bortoluzzi ◽  
W. T. Felippe ◽  
M. C. S. Felippe ◽  
W. S. Wan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Setting Time ◽  
Dimensional Change

scholarly journals Influence of Powder-to-Gel Ratio on Physicochemical Properties of a Calcium Silicate Sealer

2020 ◽  
pp. 337-345
Author(s):  
Fernanda F. E. Torres ◽  
Patricia Perinoto ◽  
Roberta Bosso-Martelo ◽  
Gisselle M. Chávez-Andrade ◽  
Juliane M. Guerreiro-Tanomaru ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Repair Material ◽  
Alkaline Ph ◽  
Root Canal Sealer ◽  
Work Time ◽  
Lower Solubility ◽  
Low Solubility ◽  
One Way Anova

Differences in liquid-to-powder ratio can affect the properties of calcium silicate-based materials. This study assessed the influence of powder-to-gel ratio on physicochemical properties of NeoMTA Plus. Setting time (minutes), flow (mm and mm²), pH (at different periods), radiopacity (mm Al) and solubility (% mass loss) were evaluated using the consistencies for root repair material (NMTAP-RP; 3 scoops of powder to 2 drops of gel) and root canal sealer (NMTAP-SE; 3 scoops of powder to 3 drops of gel), in comparison to Biodentine cement (BIO) and TotalFill BC sealer (TFBC). Statistical analysis was performed using one-way ANOVA and Tukey tests (α=0.05). BIO had the shortest setting time, followed by NMTAP-RP and NMTAP-SE. TFBC showed the highest setting time and radiopacity. BIO, NMTAP-RP, and NMTAP-SE had similar radiopacity. All materials promoted an alkaline pH. NMTAP-RP/SE presented lower solubility than BIO and TFBC. Regarding the flow, TFBC had the highest values, followed by NMTAP-SE, and NMTAP-RP. BIO had the lowest flow. In conclusion, NMTAP in both powder-to-gel ratios showed high pH and low solubility. The increase in the powder ratio decreased the setting time and flow. These findings are important regarding the proper consistency and work time to clinical application.

Evaluation of Cu/Sn-Cu Bump Bonding Processes for 3D Integration Using a Fluxing Adhesive

2010 ◽  
Vol 7 (3) ◽  
pp. 143-145 ◽  
Author(s):  
Alan Huffman ◽  
Christopher Gregory ◽  
Matthew Lueck ◽  
Jason Reed ◽  
Dorota Temple ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Environmental Protection ◽  
Cross Section ◽  
Sem Analysis ◽  
Electrical Measurements ◽  
3D Integration ◽  
Test Vehicle ◽  
Area Array ◽  
Underfill Material

We present the results of a study to evaluate the use of a fluxing adhesive developed by LORD Corp. in the bonding of Cu/Sn-Cu bump structures for interconnection in 3D integration structures. Using an area-array daisy chain test vehicle with a bump pitch of 25 μm, samples are prepared using our standard bonding methodology and also with the fluxing adhesive and then evaluated through electrical measurements and cross section SEM analysis. The results show that the use of the fluxing underfill material results in a well-formed bond between the Cu and Cu/Sn bumps and encapsulates the interconnects to provide environmental protection and additional mechanical strength to the interconnect array.

scholarly journals Investigation on Calcined Magnesium-Based Mineral Powder and Its Behavior as Alternative Binder

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
G. Sugila Devi ◽  
K. Sudalaimani
Keyword(s):  
Ph Value ◽  
Sodium Tripolyphosphate ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Heat Of Hydration ◽  
Structural Development ◽  
Initial Setting Time ◽  
Initial Setting

This paper investigates the behavior of calcined powder made of natural magnesite and natural steatite. The magnesite and steatite are made into a powder of ratio 3 : 1 by weight proportion, and the combination is thermally decomposed at a temperature of 1200° Celsius. The calcined powder along with and without Sodium Tripolyphosphate (STPP) salt is tested for its microscopic structural development, consistency, initial setting time, final setting time, and heat of hydration. The powder is made into paste with water/powder ratio as 0.25 and the hardened samples are tested for its compressive strength, drying shrinkage, pH value, SEM analysis, and XRD analysis. The results show that adding phosphate salt increases the hydration process, setting time, and strength aspects. The test samples are found with hydration products such as magnesium hydroxide and struvite. Thus, the present work shows that natural metamorphic magnesite and natural metamorphic steatite can be the potential alternative resource for the production of magnesium-based binder.

Comparing Different Cross-Section Cutting Methods for SEM Analysis of Membrane-Electrodes Assemblies

2019 ◽  
Vol 92 (8) ◽  
pp. 87-94 ◽  
Author(s):  
Susana Merino ◽  
Carlos Novillo ◽  
Gonzalo de Diego ◽  
Julio J Conde ◽  
María Antonia Folgado ◽  
...  
Keyword(s):  
Cross Section ◽  
Sem Analysis ◽  
Membrane Electrodes

Ethylene Oxide Sterilization of TiN/TiO2 Coated Titanium Implant Material

2019 ◽  
Vol 813 ◽  
pp. 178-184
Author(s):  
Maria P. Nikolova ◽  
Vesselin Nikolov ◽  
Stefan Valkov ◽  
Emil Yankov ◽  
Vanya Zaharieva ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Body Fluid ◽  
Control Sample ◽  
Titanium Implant ◽  
Sem Analysis ◽  
Xps Analysis ◽  
Percentage Contribution ◽  
Current Densities ◽  
Operation Parameters ◽  
Ethylene Oxide Sterilization

The goal of this work is to evaluate a common final sterilization technique with EtO by measuring its effect on the physicochemical properties of PVD deposited TiN/TiO2 coatings on Ti-5Al-4V alloy. As the effectiveness of EtO sterilization corresponds to the operation parameters (temperature, duration, humidity, etc.), two different exposure cycles (cool (MS) at 37 °C for 220 min gas expose and warm (SS) at 55 °C for 100 min expose) were examined. SEM analysis revealed that the surface morphology of the coatings was not changed after both MS and SS treatments. In contrast to Ti 2p and O 1s peaks determined by XPS analysis, C 1s peak of TiO2 layer decreased with increasing sterilization temperature while the percentage contribution of Ti-OH in O 1s increased. This affected the surface hydrophilicity and free energy that increased from 47.37 for the control sample to 50.77 mJ m-2 in the case of SS specimen. Additionally, EtO sterilized samples demonstrated decreased values of corrosion and passivation current densities in simulated body fluid (pH 7.4) at 37 ± 0.05 °C as opposed to the control sample. The results indicate the suitability of both mild and severe EtO sterilization methods for improvement of the desired physicochemical properties of gradient TiN/TiO2 coatings.

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