scholarly journals Creating of highly active calcium-silicate phases for application in endodontics

2013 ◽  
Vol 45 (3) ◽  
pp. 341-350 ◽  
Author(s):  
B. Colovic ◽  
V. Jokanovic ◽  
N. Jovic
Keyword(s):  
Mechanical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Morphological Characteristics ◽  
Phase Changes ◽  
Wave Method ◽  
Highly Active ◽  
Active Calcium ◽  
The Given

The synthesis of active silicate phases by combined sol gel and high-temperature selfpropagating wave method, is described in this paper. They show a significant decrease of setting time and good mechanical properties, which are very important for its potential application in endodontic practice. Particularly, process of hydration of calcium silicate phases is carefully analyzed, from the aspect of phase changes during their soaking in water for 1, 3, 7 and 28 days. XRD and FTIR methods were used for phase analysis of all samples, while morphological characteristics and chemical composition of the given phases were investigated by SEM and EDS.

scholarly journals Highly active calcium-silicate phases for application in endodontics

2013 ◽  
Vol 60 (4) ◽  
pp. 210-217 ◽  
Author(s):  
Vukoman Jokanovic ◽  
Bozana Colovic ◽  
Dejan Markovic ◽  
Slavoljub Zivkovic
Keyword(s):  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Mineral Trioxide Aggregate ◽  
Phase Changes ◽  
Highly Active ◽  
Propagating Waves ◽  
Before And After ◽  
New Material ◽  
Xrd Patterns

Introduction. Mineral trioxide aggregate (MTA) is one of the most commonly used materials in endodontics. Given its shortcomings, there is an intensive search for new materials. Calcium-silicate phase (CS phase) is a new material synthesized by the method based on a combination of sol-gel process and self-propagation synthesis which can significantly improve setting time through accelerated hydration. The aim of this study was to explain the mechanisms of hardening of CS phase in aqueous medium as similar mechanism is expected in contact with body fluids. Materials and Methods. CS phases Ca3SiO5 (C3S) and 2?-CaSiO4 (?-C2S) were synthesized from CaCl2?5H2O (Merck, Germany). To investigate the process of hydration, CS were mixed with water and kept at 37 ?C for 28 days in closed polyethylene containers. Analysis of the composition of samples before and after immersion in water for 1, 3, 7 and 28 days was performed using X - ray diffractometry and IR. Results. XRD patterns for hydrated samples during 1, 3, 7 and 28 days showed that the amount of hydrated tobermorite phases relative to the amount of CS phase changes with the time of hydration. After 1 day, in addition to the hydrated phases, a significant amount of untransformed ?-C2S and C3S were found while after 28 days hydrated CS phase was completely transformed to tobermorite with a small amount of portlandite. Conclusion. Using combined method of sol-gel and self-propagating waves at high temperature very active nanostructured silicate phases were obtained. Hydration process of CS phases was analyzed using XRD and FTIR, the mechanism of hydration was proposed and it was pointed to the difficulties in determining the exact reaction as well as the problem of determining the exact structure of tobermorite.

scholarly journals Physicochemical and Biological Properties of Mg-Doped Calcium Silicate Endodontic Cement

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1843
Author(s):  
Kyung-Hyeon Yoo ◽  
Yong-Il Kim ◽  
Seog-Young Yoon
Keyword(s):  
Mechanical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Biological Properties ◽  
Hydration Properties ◽  
Calcium Silicate Cement ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Physicochemical And Biological Properties ◽  
Mg Doped

Calcium silicate-based cement has been widely used for endodontic repair. However, it has a long setting time and needs to shorten setting time. This study investigated the effects of magnesium (Mg) ion on the setting reaction, mechanical properties, and biological properties of calcium silicate cement (CSC). Sol-gel route was used to synthesize Mg ion-doped calcium silicate cement. Synthesized cement was formulated with the addition of different contents of Mg ion, according to 0, 1, 3, 5 mol% of Mg ion-doped calcium silicate. The synthesized cements were characterized with X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). We also evaluated the physicochemical and biological properties of cement, such as the setting time, compressive strength, micro-hardness, simulated body fluid (SBF) immersion, cytotoxicity, and cell differentiation tests. As a result, the Mg ion improves the hydration properties of calcium silicate cement, and the setting time is reduced by increasing the amounts of Mg ion. However, the mechanical properties deteriorated with increasing Mg ion, and 1 and 3 mol% Mg-doped calcium silicate had appropriate mechanical properties. Also, the results of biological properties such as cytotoxicity, ALP activity, and ARS staining improved with Mg ion. Consequently, the optimal condition is 3 mol% of Mg ion-doped calcium silicate (3%Mg-CSC).

scholarly journals Effect of Silver Nanoparticles on Physicochemical and Antibacterial Properties of Calcium Silicate Cements

2016 ◽  
Vol 27 (5) ◽  
pp. 508-514 ◽  
Author(s):  
Fernando Vazquez-Garcia ◽  
◽  
Mário Tanomaru-Filho ◽  
Gisselle Moraima Chávez-Andrade ◽  
Roberta Bosso-Martelo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Compressive Strength ◽  
Antibacterial Activity ◽  
Calcium Silicate ◽  
Setting Time ◽  
Antibacterial Properties ◽  
Mineral Trioxide Aggregate ◽  
Biological Properties ◽  
Calcium Silicate Cements

Abstract Mineral trioxide aggregate (MTA) and Portland cement (PC) are calcium silicate cements. They have similar physicochemical, mechanical and biological properties. The addition of zirconium oxide (ZrO2) to PC provides radiopacity. Silver nanoparticles (AgNPs) may improve some properties of cements. The aim of this study was to evaluate the effect of AgNPs on physicochemical/mechanical properties and antibacterial activity of white MTA (WMTA) and PC associated with ZrO2. The following materials were evaluated: WMTA; PC 70% + ZrO2 30%; WMTA+ AgNPs; and PC 70% + ZrO2 30% + AgNPs. The study evaluated radiopacity, setting time, pH, compressive strength and solubility. For radiopacity analysis, radiographs were made alongside an aluminum (Al) step wedge. To evaluate the antibacterial activity, direct contact test was performed on planktonic cells and Enterococcus faecalis biofilm induced on bovine root dentin for 14 days. The experimental periods were 5 and 15 h. Data were obtained as CFU mL-1. The obtained data were submitted to ANOVA and Tukey tests (p<0.05). The addition of AgNPs to WMTA increased the pH, lowered the solubility and the initial and final setting times. The addition of AgNPs to PC/ZrO2 maintained the pH, lowered the solubility, and increased the setting time and compressive strength. The radiopacity of all materials was higher than 4 mmAl. The addition of AgNPs promoted an increase in antibacterial activity for calcium silicate cements and favored the physicochemical and mechanical properties of the materials.

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 A influência do tamanho de partícula na reação de presa de cimentos de silicate de cálcio produzidos por sol-gel

2021 ◽  
Vol 62 (1) ◽  
pp. 63-70
Author(s):  
Fabio De Cesare ◽  
Gabriela De Souza Balbinot ◽  
Vicente Castelo Branco Leitune ◽  
Fabrício Mezzomo Collares
Keyword(s):  
Particle Size ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Setting Reaction ◽  
Fourier Transformed Infrared Spectroscopy

Introduction: This study aims to analyze the influence of particles size of sol-gel derived calcium silicate particles in the setting reaction of bioactive endodontic cements. Materials and Methods: Sol-gel derived calcium silicate particles were synthesized and sieved to separate the particles in different sizes: CS400, CS200, and CS100. A commercial MTA (Control) was used as control. The particle size and the specific surface area were assessed by laser diffraction and nitrogen adsorption. The cements were prepared with water as the liquid for the reaction. The setting time was conducted according to ISO 6876, and the setting kinetics was analyzed by Fourier transformed infrared spectroscopy (FTIR) at different time points between 120s to 72h. Results: The particle size varied from 9.45µm (CS400 ) to 31.01 (Control). The higher specific surface area valuer reached 15.14g/cm2 in the CS400. The smallest particle sizes, the higher specific surface area, and the lowest setting time were found for CS400 (p < 0.05). Control presented the highest setting time (p < 0.05). The FTIR analyses showed the differences in materials structure over time, with faster hydration and crystallization for CS400. The setting kinetics was slower for Control even when compared to a sol-gel derived group with similar particle size. Conclusion: The route of synthesis and the particle size influences the setting reaction of calcium silicate-based cements. The reduction of particle size for sol-gel derived calcium silicates lead to the acceleration of the setting reaction of the produced bioactive endodontic cement.

scholarly journals In Vitro Biocompatibility of Nanostructured Endodontic Materials Using SCAP Cells

2017 ◽  
Vol 21 (3) ◽  
pp. 167-170 ◽  
Author(s):  
Bojana Ćetenović ◽  
Božana Čolović ◽  
Saša Vasilijić ◽  
Snežana Pašalić ◽  
Vukoman Jokanović ◽  
...  
Keyword(s):  
Sol Gel ◽  
Human Stem Cells ◽  
In Vitro Biocompatibility ◽  
Highly Active ◽  
Diphenyltetrazolium Bromide ◽  
Relative Viability ◽  
Apical Papilla ◽  
Active Calcium ◽  
Synthesized Materials

Summary Background/Aim: Lately, fully innovative sol-gel method with high-temperature self-propagating reaction was used for the synthesis of new nanostructured endodontic materials, in combination with different radiopacifiers: bismuth (ALBO-MPCA1) and barium (ALBO-MPCA2). The aim of this study was to investigate the biocompatibility of nanostructured endodontic materials based on highly active calcium silicates and mixed with different radiopacifiers in comparison to MTA+ using human stem cells from the apical papilla- SCAP cells. Material and Methods: Morphology of the samples was studied by SEM. The tested materials were mixed with distilled water in a ratio 2:1 (m/m). Fifteen minutes fter the preparation, samples were used in the experiment. The biocompatibility of fresh materials, after 3h and 7 days, was tested using 3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide- MTT test. Results: Samples mostly consisted of spherical and rode-like. The relative viability of cells increased following the exposure time. Conclusion: The biocompatibility of synthesized materials is comparable to the control material MTA+, and therefore these materials can be recommended for for further clinical stuadies.

A novel, doped calcium silicate bioceramic synthesized by sol–gel method: Investigation of setting time and biological properties

2019 ◽  
Vol 108 (1) ◽  
pp. 56-66 ◽  
Author(s):  
Mohamed Mahmoud Abdalla ◽  
Christie Ying Kei Lung ◽  
Prasanna Neelakantan ◽  
Jukka Pekka Matinlinna
Keyword(s):  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Biological Properties ◽  
Gel Method ◽  
Sol Gel Method

Effects of Niobium Oxide Addition on the Mechanical Properties of Glass Ionomer Cement

2015 ◽  
Vol 815 ◽  
pp. 373-378 ◽  
Author(s):  
Shi Qun Li ◽  
Bao Hui Su ◽  
Jun Guo Ran ◽  
Jun Wang ◽  
Ling Ling Yan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Vickers Hardness ◽  
Niobium Oxide ◽  
Setting Time ◽  
Sol Gel ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Ft Ir ◽  
Ionomer Cement

Aiming at inadequate mechanical properties of Glass ionomer cement (GIC) commonly used in dental clinic, commercial and melt quenched GIC powders as control groups, homemade GIC powder was prepared by sol–gel route and modified by Nb2O5. The GIC samples were characterized by X-ray Diffraction (XRD), particle size analysis, Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FT-IR). The compressive strength, Vickers hardness, working and net setting time were tested. The data was analyzed by one-way ANOVA. The XRD results showed that commercial, melt quenched and sol gel GIC powders were similar amorphous. D90 of three GIC powders and Nb2O5 powder were 26 μm, 17 μm, 29 μm and 19 μm respectively. 5% Nb2O5-GIC exhibited the highest values of compressive strength and Vickers hardness, which were 112.93 Mpa, 139.48 MPa and 142.25 MPa respectively, increased 19.11%, 30.56% and 16.51% (P <0.05); the Vickers hardness were 35.15 MPa, 36.23 MPa and 37.62 MPa, increased 18.03%, 29.95% and 16.32% (P <0.05) compared to those of unmodified GICs as well. There was no significant change of the FT-IR characteristic peaks of modified GIC. The working time of three kinds of GIC were 4'58 ", 3'28" and 4'10 ", the net setting time were 5'16", 3'15 "and 4'38" (standard is 1.5-6 minutes). It was concluded that the dispersion stiffened effect of niobium oxide could improve the mechanical properties of the filling GIC without affecting the clinical operating performance.

scholarly journals A novel sol-gel-derived calcium silicate cement with short setting time for application in endodontic repair of perforations

2018 ◽  
Vol Volume 13 ◽  
pp. 261-271 ◽  
Author(s):  
Bor-Shiunn Lee ◽  
Hong-Ping Lin ◽  
Jerry Chun Chung Chan ◽  
Wei-Chuan Wang ◽  
Ping-Hsuan Hung ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Setting Time ◽  
Sol Gel ◽  
Calcium Silicate Cement ◽  
Short Setting Time
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