scholarly journals Physico-Chemical Investigation of Endodontic Sealers Exposed to Simulated Intracanal Heat Application: Hydraulic Calcium Silicate-Based Sealers

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 728
Author(s):  
David Donnermeyer ◽  
Magdalena Ibing ◽  
Sebastian Bürklein ◽  
Iris Weber ◽  
Maximilian P. Reitze ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Film Thickness ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Chemical Properties ◽  
Chemical Changes ◽  
Time Flow ◽  
Heat Application

The aim of this study was to gain information about the effect of thermal treatment of calcium silicate-based sealers. BioRoot RCS (BR), Total Fill BC Sealer (TFBC), and Total Fill BC Sealer HiFlow (TFHF) were exposed to thermal treatment at 37 °C, 47 °C, 57 °C, 67 °C, 77 °C, 87 °C and 97 °C for 30 s. Heat treatment at 97 °C was performed for 60 and 180 s to simulate inappropriate application of warm obturation techniques. Thereafter, specimens were cooled to 37 °C and physical properties (setting time/flow/film thickness according to ISO 6876) were evaluated. Chemical properties (Fourier-transform infrared spectroscopy) were assessed after incubation of the specimens in an incubator at 37 °C and 100% humidity for 8 weeks. Statistical analysis of physical properties was performed using the Kruskal-Wallis-Test (P = 0.05). The setting time, flow, and film thickness of TFBC and TFHF were not relevantly influenced by thermal treatment. Setting time of BR decreased slightly when temperature of heat application increased from 37 °C to 77 °C (P < 0.05). Further heat treatment of BR above 77 °C led to an immediate setting. FT-IR spectroscopy did not reveal any chemical changes for either sealers. Thermal treatment did not lead to any substantial chemical changes at all temperature levels, while physical properties of BR were compromised by heating. TFBC and TFHF can be considered suitable for warm obturation techniques.

scholarly journals Development of resin-based bioactive endodontic cements with glycerol salicylate and calcium silicate

2020 ◽  
Vol 61 (1) ◽  
pp. 69-76
Author(s):  
Rafaela Cassaro Pistorello ◽  
Gabriela De Souza Balbinot ◽  
Vicente Castelo Branco Leitune ◽  
Fabricio Mezzomo Collares
Keyword(s):  
Calcium Silicate ◽  
Methyl Salicylate ◽  
Setting Time ◽  
Sol Gel ◽  
Chemical Properties ◽  
Distilled Water ◽  
Physical Chemical ◽  
Time Flow

Introduction: The combination of sol-gel derived calcium silicate particles and glycerol salicylate resins may enhance the pyhisico-chemical properties contribute to the understanding of the interaction between these materials. This study aims to evaluate the physical-chemical properties of resin-based bioactive endodontic cements with glycerol salicylate resins and calcium silicate particles. Materials and methods: Calcium silicate was produced by the sol-gel route, while the resin was produced by mixing 60wt% glycerol salicylate, 30wt% methyl salicylate and 10wt% distilled water. Calcium silicate was added in three different concentrations, 50, 40 and 25% by weight. The cement was tested for setting time, flow, radiopacity and pH. Results: The 50:50 group shows the time of 15min8s while the 75:25 shows the time of 256min13s (p

scholarly journals Physical and Biological Properties of a High-Plasticity Tricalcium Silicate Cement

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Arthur Dias Galarça ◽  
Wellington Luiz de Oliveira Da Rosa ◽  
Tiago Machado Da Silva ◽  
Giana da Silveira Lima ◽  
Neftalí Lenin Villarreal Carreño ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Film Thickness ◽  
Cell Viability ◽  
Water Solubility ◽  
Setting Time ◽  
Mineral Trioxide Aggregate ◽  
Biological Properties ◽  
High Plasticity ◽  
Silicate Matrix ◽  
Time Flow

Introduction. Mineral Trioxide Aggregate (MTA) is a tricalcium-based silicate, dicalcium silicate matrix. Despite its good biologic properties, some clinicians still claim to have difficulties in handling MTA after its preparation due to its sandy consistency. The aim of the present study was to evaluate the physicochemical properties and cytotoxicity of MTA Repair HP (Angelus, Londrina, PR, Brazil) compared with MTA Angelus (Angelus, Londrina, PR, Brazil). Materials and Method. The properties assessed were particle size, setting time, flow, film thickness, radiopacity, water solubility, compressive strength, and cytotoxicity. Statistical analysis was performed considering p < 0.05 as statistically significant. Results. For radiopacity, water absorption and solubility MTA Repair HP were statistically similar to MTA Angelus. The MTA Angelus had statistically different film thickness values, higher than MTA Repair HP (p < 0.05). Besides, MTA Angelus showed a lower and statistically different compressive strength after 28 days than MTA Repair HP (p<0.05). Additionally, MTA Repair HP set more slowly (p < 0.05). Relative to cell viability, MTA Repair HP was statistically similar to MTA Angelus after 24 and 48 h in cell viability. Conclusions. The MTA Repair HP presented similar cell viability, lower film thickness, higher flow, setting time, and compressive strength values after 28 days than MTA Angelus. In general, the MTA Repair HP presented physicochemical and biological properties similar to the MTA Angelus.

scholarly journals Optimal Thermal Treatment for Effective Copper Recovery in Waste Printed Circuit Boards by Physical Separation: Influence of Temperature and Gas

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1213
Author(s):  
Boram Kim ◽  
Seongsoo Han ◽  
Seungsoo Park ◽  
Seongmin Kim ◽  
Minuk Jung ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Printed Circuit Boards ◽  
Separation Efficiency ◽  
Size Fraction ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit

Printed circuit boards (PCBs) are difficult to recycle because of the layered structure of non-metal (i.e., epoxy resin, glass fiber) and copper. In this work, we conducted a systematic investigation to effectively recover copper from PCB. A thermal treatment was employed for improving the crushing performance of PCB and conducted by varying the temperature and the gas. Then, the mechanical strength, degree of liberation (DL), and copper separation efficiency of the heat-treated and untreated PCBs were investigated. After heat treatment under a 300 °C air atmosphere, the mechanical strength of PCB decreased from 386.36 to 24.26 MPa, and copper liberation improved from 9.3% to 100% in the size range of a coarser size fraction (>1400 μm). Accordingly, when electrostatic separations were performed under these conditions, a high-Cu-grade concentrate and high recovery could be obtained. The results show that the change in the physical properties of the PCBs leads to an improvement in the DL following thermal decomposition at 300 °C in air. Our study elucidates the physical properties of PCBs and the DL under various heat treatment conditions. Furthermore, it shows that the heat treatment condition of 300 °C in air is ideal for recovering copper from the PCB.

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.

Removal of Organic Phase in Alumina Parts by Thermal Treatment

2015 ◽  
Vol 1765 ◽  
pp. 17-22
Author(s):  
José J. Coronel-Hernández ◽  
Víctor M. Arellano-Badillo ◽  
José Santos-Cruz ◽  
Sandra A. Mayén-Hernández ◽  
Rocío Quintanar-Hernández
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Physical Properties ◽  
Organic Phase ◽  
Organic Binder ◽  
Sintering Process ◽  
Favorable Conditions

ABSTRACTIn this work it was conducted a pre heat treatment of a number of samples of alumina with organic binder in order to remove most of the organic phase. The treatment showed no effect on the physical properties of test specimens; green bodies remained stable during sintering process. Preheating at 100 °C for 4 h followed by heating at 300 °C for 4 h were the most favorable conditions to avoid formation of defects in the sintered pieces.

scholarly journals Biodentinetm as a furcal perforation repair material: A case series

2017 ◽  
Vol 70 (7-8) ◽  
pp. 223-225 ◽  
Author(s):  
Sonja Apostolska ◽  
Marina Eftimoska ◽  
Vasilka Rendzova ◽  
Saso Elencevski ◽  
Nadica Janeva ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Case Reports ◽  
Setting Time ◽  
Case Series ◽  
Chemical Properties ◽  
High Mechanical Strength ◽  
Handling Characteristics ◽  
Treat Ment ◽  
Wide Range ◽  
Calcium Silicate Cements

Introduction. So far, the most promising and most commonly used materials in endodontic treatment and retreatment were calcium silicate cements. However, due to the shortage of this material and treatment failures, a new bioactive material was introduced - Biodentinetm. It is a calcium silicate based technology, with excellent handling characteristics and biocompatibility. It can be used in various indications, including dentine substitution and endodontic therapy. Case reports. The clinical cases demonstrated excellent healing potential after the treat?ment with Biodentinetm. Conclusion. The bio-silicate technology is highly promising, mostly due to its chemical properties and easy clinical manipulation. The short setting time and high mechanical strength makes Biodentinetm a material easy to han?dle, highly biocompatible, with a wide range of indications.

Effect of heat application on the physical properties and chemical structure of calcium silicate-based sealers

2020 ◽  
Author(s):  
Hacer Aksel ◽  
Steven Makowka ◽  
Fatima Bosaid ◽  
Mary Grace Guardian ◽  
Debanjan Sarkar ◽  
...  
Keyword(s):  
Physical Properties ◽  
Calcium Silicate ◽  
Chemical Structure ◽  
Heat Application

scholarly journals Effect of Heat-Treatment Remediation on the Mechanical Behavior of Oil-Contaminated Soil

2020 ◽  
Vol 10 (9) ◽  
pp. 3174
Author(s):  
Meng-Chia Weng ◽  
Chiou-Liang Lin ◽  
Cheng-Hsi Lee
Keyword(s):  
Heat Treatment ◽  
Physical Properties ◽  
Contaminated Soil ◽  
Removal Rate ◽  
Chemical Properties ◽  
Total Petroleum Hydrocarbons ◽  
Size Analysis ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

The heat treatment of oil-contaminated sites is widely carried out for the purposes of remediation. However, heat treatment changes the physical and chemical properties of soil. Before the soil can be reused as a construction material in civil engineering, such as in backfill or road base materials, the changes to its physical properties must be understood. Therefore, this study investigates the changes in the physical and chemical properties of oil-contaminated soil after heat treatment. In this investigation, experimental samples of soil with added oil from a refinery plant are used to investigate the removal rate of total petroleum hydrocarbons (TPHs) by thermal desorption and incineration. The physical properties of the soil, including water permeability and mechanical properties, are compared before and after heat treatment. The results of this study are as follows. (1) Particle size analysis reveals that heat treatment makes soil particles finer. (2) In the burning reduction test, heat treatment at 900 °C removes more than 90% of THP. (3) In the direct shear test, the friction angle (ϕ) increases with the removal rate. (4) In the hydraulic test, as the removal rate increases, the permeability coefficient increases after heat treatment.

scholarly journals Effects of Thermal Treatment on the Physical Properties of Edible Calcium Alginate Gel Beads: Response Surface Methodological Approach

Foods ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 578 ◽  
Author(s):  
Seonghui Kim ◽  
Chungeun Jeong ◽  
Suengmok Cho ◽  
Seon-Bong Kim
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Physical Properties ◽  
Response Surface ◽  
Calcium Alginate ◽  
Rupture Strength ◽  
Heating Temperature ◽  
Methodological Approach ◽  
Alginate Gel ◽  
Calcium Alginate Gel

Calcium alginate gel (CAG) has been widely investigated for the development of artificial foods; however, there are few studies on its thermal stability. This study aimed to monitor changes in the physical properties of CAG beads during heat treatment using response surface methodology. Heating temperature (X1, 40–100 °C) and heating time (X2, 5–60 min) were chosen as independent variables. The dependent variables were rupture strength (Y1, kPa), size (Y2, μm), and sphericity (Y3, %). The heating temperature (X1) was the independent variable that had a significant effect on the rupture strength (Y1) and size (Y2). Rupture strength (Y1) increased as the heating temperature (X1) increased; at the same time, the CAG beads size (Y2) decreased. With all conditions, the values of sphericity (Y3) were over 94%. SEM images revealed that increase in the rupture strength of the CAG beads by heat treatment resulted from their porous structures. Loss of moisture by syneresis, occurring with heat treatment, was judged to create a dense porous structure of CAG beads. Our findings offer useful information for cooking or sterilizing food products utilizing CAG beads. In addition, thermal treatment could be applied to produce hard CAG beads with a high rupture strength.

Impact of Heat Treatment on some Physical Properties of Thin CdZnS

2012 ◽  
Vol 2 (3) ◽  
pp. 362-365
Author(s):  
Iqbal S Naji ◽  
◽  
M.F.A.Alias M.F.A.Alias ◽  
Eman M Naser
Keyword(s):  
Heat Treatment ◽  
Physical Properties
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