scholarly journals A New Calcium Silicate-Based Root Canal Dressing: Physical and Chemical Properties, Cytotoxicity and Dentinal Tubule Penetration

2020 ◽  
Vol 31 (6) ◽  
pp. 598-604
Author(s):  
Natália Villa ◽  
Vanessa Valgas Dos Santos ◽  
Ubirajara Maciel da Costa ◽  
Aline Teixeira Mendes ◽  
Pedro Henrique Marks Duarte ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Ion ◽  
Calcium Silicate ◽  
Chemical Properties ◽  
Dentinal Tubule ◽  
Ion Release ◽  
Tukey Test ◽  
Physical And Chemical ◽  
Tubule Penetration ◽  
And Chemical Properties

Abstract The aims of this study were to evaluate the physical and chemical properties, cytotoxicity and dentinal tubule penetration of a new calcium silicate-based root canal dressing. For pH and calcium ion release evaluation (1, 24, 72 and 168 h) were used a pH meter and colorimetric spectrophotometer, respectively. Radiopacity evaluation followed the ISO 6876:2012. Cytotoxicity was evaluated by the percentage of cell viability using MTT assay. Illustrative images of dentinal tubule penetration were obtained using confocal laser scanning microscopy (CLSM). Data from pH and calcium ion release were statistically analyzed by two-way analysis of variance and Tukey test. Radiopacity was analyzed using the Student t-test. The statistical tests for cytotoxicity results were the one-way analysis of variance and Tukey test. Both materials showed alkaline pH in all experimental times. The pH values for calcium hydroxide paste were higher than bioceramic paste at 1, 24, and 72 h (p<0.05). The calcium ion release of bioceramic was lower than the calcium hydroxide paste only at 24 h (p<0.05). The bioceramic was more radiopaque than the calcium hydroxide paste (p<0.05). Bioceramic paste presented a dose and time-dependent cytotoxic effect after MTT assay. CLSM images showed absence of tubule penetration for both pastes. The new calcium silicate-based canal dressing presented alkaline pH, high calcium release, and acceptable radiopacity. Bio C Temp showed a dose and time-dependent cytotoxic and absence of dentinal tubule penetration.

scholarly journals Effects of calcium hydroxide addition on the physical and chemical properties of a calcium silicate-based sealer

2014 ◽  
Vol 22 (3) ◽  
pp. 180-184 ◽  
Author(s):  
Milton Carlos KUGA ◽  
Marco Antonio Hungaro DUARTE ◽  
Arnaldo SANT'ANNA-JÚNIOR ◽  
Kátia Cristina KEINE ◽  
Gisele FARIA ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Silicate ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

scholarly journals Evaluation of flowability, pH and calcium ion release of high-plasticity cements

2019 ◽  
Author(s):  
Thiago Bessa Marconato Antunes ◽  
Marina Angelica Marciano da Silva ◽  
Lauter Eston Pelepenko
Keyword(s):  
Zinc Oxide ◽  
Calcium Ion ◽  
Calcium Release ◽  
Chemical Properties ◽  
Water Soluble ◽  
High Plasticity ◽  
Ion Release ◽  
Water Soluble Polymer ◽  
Physical And Chemical ◽  
And Chemical Properties

The aim of the study is to evaluate the physical and chemical properties of high plasticity calcium silicate-based cements (MTA HP, and MTA Flow) and to purpose a novel high plasticity cement composed of tricalcium and dicalcium silicate, bismuth oxide, zinc oxide and in the liquid, distilled water and water-soluble polymer. The association of zinc oxide in MTA Flow will be also evaluated to inhibit dental discoloration verified in a pilot test. The flowability, pH and calcium release will be evaluated.

scholarly journals Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex

2012 ◽  
Vol 3 (2) ◽  
pp. 180-183
Author(s):  
Marcelo Ferrarezi de Andrade ◽  
Renato de Toledo Leonardo ◽  
Edson Alves de Campos ◽  
Milton Carlos Kuga ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Ph Value ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
The One ◽  
Physical And Chemical ◽  
The Impact ◽  
And Chemical Properties

ABSTRACT Objective This study evaluated the flow, pH and calcium release of MTA Fillapex (G1) or Fillapex plus 10% in weight of calcium hydroxide powder (G2), compared to AH Plus (G3) and Sealapex (G4). Materials and methods The flow test was performed according to ISO 6876:2001 requirements. The sealers were placed into plastic tubes and immersed in deionized water. After 24 hours, 7, 14 and 28 days, the water of each tube was removed and tested to evaluate the pH values and the level of released calcium. Calcium release values were analyzed statistically by Kruskal Wallis and Dunn tests and pH values analyzed by ANOVA and Tukey tests (α = 5%). Results G1 presented higher flow among all sealers. The addition of 10% calcium hydroxide into MTA Fillapex reduced the flow (p < 0.05) but, in a level, that is lower than the one recommended for ISO norms. G2 and G4 presented pH values and calcium release higher than G3 (p < 0.05) in all periods. G1 presented pH value higher than G3 (p < 0.05), except in 7 days period (p > 0.05). G4 presented higher pH values than G1 and G2, but the calcium release was similar for all periods (p > 0.05). G3 presented lower calcium release among all groups (p < 0.05). Conclusion The addition of 10% calcium hydroxide in MTA Fillapex caused reduction in flow and no negative interference in pH and/or calcium release. However, the obtained flow is different from ISO requirements. Clinical relevance MTA Fillapex presents levels of flow above the ISO norms. The addition of calcium hydroxide is a suggestion for solving this problem, but the impact of these procedures should be carefully evaluated. How to cite this article Keine KC, Guiotti FA, Leonardo RT, Kuga MC, Duarte MAH, de Campos EA, de Andrade MF. Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex. World J Dent 2012;3(2):180-183.

scholarly journals Drying effect on physical and physicochemical properties and bioactive compounds of kiwifruit powder

2020 ◽  
pp. 524-530 ◽  
Author(s):  
Inacia dos Santos Moreira ◽  
Wilton Pereira da Silva ◽  
Josivanda Palmeira Gomes ◽  
Deise Souza de Castro ◽  
Luzia Márcia de Melo Silva ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Chemical Properties ◽  
Convective Drying ◽  
Physical Parameters ◽  
Physical And Chemical Properties ◽  
Tukey Test ◽  
Air Temperatures ◽  
Different Temperatures ◽  
Physical And Chemical ◽  
And Chemical Properties

This study aimed to evaluate the effect of convective drying at different temperatures on the physical and chemical properties of kiwifruit powder. Circular kiwi slices were cut with thickness of 5.0 mm and subjected to different drying air temperatures (50, 60, 70 and 80 ºC). After drying, the slices were ground to obtain the powder and characterized for the physical parameters, physicochemical parameters and bioactive compounds. The powders were characterized for physical and physicochemical attributes and bioactive compounds. The experimental design was completely randomized, with three replicates, and the data were subjected to analysis of variance by F test and to Tukey test at 0.05 probability level. Kiwifruit powders obtained by convective drying at 50, 60, 70 and 80 ºC were classified as non-hygroscopic, showing good flowability and low cohesiveness. Kiwifruit powders obtained at temperatures of 70 and 80 ºC had lower moisture content and water activity, with predominance of yellow intensity over red intensity, which influenced their final color according to the drying air temperature. Powders obtained at the four drying temperatures showed significant amounts of bioactive compounds; thus, they can be consumed in powder and used in the preparation of food products. However, samples dehydrated at temperature of 70 ºC had higher contents of phenolic compounds compared to the others.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

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