scholarly journals In Vitro Bioactivity and Setting Times of White Portland Cement Combined with Different Radio Pacifying Agents

2017 ◽  
Vol 109 ◽  
pp. 03003 ◽  
Author(s):  
Nichola Jayne Coleman ◽  
Rajitha Hanarasinghe ◽  
Zeynep Aslı Güçlü ◽  
Samantha Ellen Booth
Keyword(s):  
Portland Cement ◽  
In Vitro Bioactivity ◽  
Setting Times ◽  
White Portland Cement

scholarly journals Impact of Bi2O3 and ZrO2 Radiopacifiers on the Early Hydration and C–S–H Gel Structure of White Portland Cement

2019 ◽  
Vol 10 (4) ◽  
pp. 46 ◽  
Author(s):  
Qiu Li ◽  
Nichola J. Coleman
Keyword(s):  
Portland Cement ◽  
Magic Angle Spinning ◽  
Cement Matrix ◽  
Resonance Spectroscopy ◽  
Magic Angle ◽  
Gel Structure ◽  
Early Hydration ◽  
Setting Times ◽  
The Impact ◽  
White Portland Cement

Bismuth oxide (monoclinic α-Bi2O3) and zirconium oxide (monoclinic ZrO2) are the most popular radiopacifiers in commercial Portland cement-based endodontic restoratives, yet their effects on the setting and hydration reactions are not fully understood. This study compares the impact of 20 wt.% of Bi2O3 or ZrO2 on the early hydration reactions and C–S–H gel structure of white Portland cement (WPC). Cement paste samples were hydrated at 37.5 °C prior to analysis by 29Si and 27Al magic angle spinning nuclear magnetic resonance spectroscopy at 3 h and 24 h, and transmission electron microscopy at 3 h. Initial and final setting times were determined using a Vicat apparatus and reaction kinetics were monitored by isothermal conduction calorimetry. Bi2O3 was found to prolong initial and final setting times and retard the degree of hydration by 32% at 24 h. Heat evolution during the acceleration and deceleration phases of the hydration process was reduced and the exotherm arising from renewed ettringite formation was delayed and diminished in the presence of Bi2O3. Conversely, ZrO2 had no significant impact on either setting time; although, it accelerated hydration by 23% within 24 h. Increases in the mean silicate chain length and the extent of aluminum substitution in the C–S–H gel were observed in the presence of both radiopacifying agents after 24 h relative to those of the unblended WPC. The Bi2O3 and ZrO2 particles remained intact within the cement matrix and neither bismuth nor zirconium was chemically incorporated in the hydration products.

scholarly journals Influence of Strontium on the Physical, Mechanical and In-Vitro Bioactivity of Glass Ionomer Cements

2019 ◽  
Vol 6 (1) ◽  
pp. 30-39
Author(s):  
Yiyu Li
Keyword(s):  
Flexural Strength ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
In Vitro Bioactivity ◽  
Maturation Time ◽  
Setting Times ◽  
Incubation Periods ◽  
Strontium Incorporation ◽  
Glass Compositions

In this work, we investigated the effects of strontium incorporation in the glass phase of glass ionomer cements (GIC). Three different glass compositions were synthesized with 0, 5, and 10 mol% of SrO addition. GICs were prepared by the addition of 50 wt% polyacrylic acid (PAA) at powder to liquid ratio of 1:1.5. Initial characterization on the cement series was to study their rheological behavior. Cements represented working times between 50-64 seconds and setting times of 356-452 seconds. Rheological results indicated that the addition of strontium decreases the working and setting times of the cements. To analyze the mechanical properties, compressive and flexural strength studies were performed after 1, 10, and 30 days incubation in simulated body fluid (SBF). The compressive strength of the cements increased as a function of incubation time, with the strontium containing compositions showing the highest strength at 34 megapascal (MPa) and after 30 days of incubation. Biaxial flexural strength of the cements was not significantly affected by the composition and maturation time and ranged between 13.4 to 16.3 MPa. In-vitro bioactivity of the cements was analyzed using SBF trials and after 1, 10, and 30 days incubation periods. Strontium containing cements, showed higher solubility with higher amounts of calcium phosphate surface depositions only after 10 days incubation. The elemental identifications of the surface depositions indicated high amounts of Ca, P and Zn are present on the surface of SBF incubated samples.

scholarly journals In vitro sealing ability of white and gray mineral trioxide aggregate (MTA) and white Portland cement used as apical plugs

2007 ◽  
Vol 15 (3) ◽  
pp. 181-185 ◽  
Author(s):  
Patrícia Zanatta Aranha Coneglian ◽  
Fernando Accorsi Orosco ◽  
Clóvis Monteiro Bramante ◽  
Ivaldo Gomes de Moraes ◽  
Roberto Brandão Garcia ◽  
...  
Keyword(s):  
Portland Cement ◽  
Mineral Trioxide Aggregate ◽  
Sealing Ability ◽  
White Portland Cement

Strength and Bioactivity of Hydroxyapatite/White Portland Cement (HAp/WPC) under Simulated Body Fluid (SBF) Solution

2020 ◽  
Vol 975 ◽  
pp. 88-93
Author(s):  
Weerapol Taptimdee ◽  
Prinya Chindaprasirt ◽  
Yuichi Otsuka ◽  
Yoshiharu Mutoh ◽  
Teerawat Laonapakul
Keyword(s):  
Compressive Strength ◽  
Simulated Body Fluid ◽  
Portland Cement ◽  
Body Fluid ◽  
Apatite Formation ◽  
Sbf Solution ◽  
Biological Environment ◽  
White Portland Cement

In this study, the effects of curing white Portland cement (WPC) and hydroxyapatite mixed with white Portland cement (HAp/WPC) pastes in water and the in vitro biological environment on the compressive strength and bone-like apatite formation were examined. The compressive strength of both WPC and HAp/WPC pastes increased with longer curing periods in water. The compressive strength of WPC and HAp/WPC pastes was 51.88 and 25.67 MPa, respectively, after curing in water for 28 days. The compressive strength of both samples continuously increased during in vitro testing in a simulated body fluid (SBF). After 4 weeks of immersion in a SBF, the strengths of cured WPC and HAp/WPC samples were 59.01 and 28.06 MPa, respectively. It is due to continued hydration of WPC. The addition of HAp to WPC decreased the compressive strength of the sample. Alternatively, it enhanced bone-like apatite formation on the surface of the samples.

scholarly journals Comparative Study for Microleakage in Three Retrograde Materials for Filling Root End—Biodentine, Mineral Trioxide Aggregate, and Portland Cement: An In Vitro Preliminary Study

2021 ◽  
Author(s):  
Shagun Bhatia ◽  
Ankush Jain ◽  
Kanu Jain ◽  
Atul Kumar Bishnoi
Keyword(s):  
Portland Cement ◽  
Mineral Trioxide Aggregate ◽  
Human Teeth ◽  
Group Iii ◽  
Gutta Percha ◽  
India Ink ◽  
Group I ◽  
Preliminary Study ◽  
White Portland Cement

Abstract Introduction Insufficient seal of apex is a significant reason for an endodontist’s disappointment. The materials for root-end filling utilized ought to forestall departure of possible pollutants into periapical areas. The objective of this analysis was to compare the fixing capacity of three materials: white mineral trioxide aggregate (MTA), white Portland cement (PC), and Biodentine. This was analyzed through a test checking for dye leakage. Materials and Methods Thirty human teeth having one root were subjected to instrumentation followed by gutta-percha obturation. An apical pit was readied for the material. The tooth samples were then grouped into three trial bunches: Group I, Biodentine; Group II, white MTA; and Group III, white PC. Root-end pits in the test bunches were loaded-up with the exploratory materials. The tooth samples were kept in India ink for a duration of 72 hours. The degree of color infiltration was estimated with the help of a stereomicroscope at 16× amplification. Color entrance was observed in the whole root in vitro. Results The sequelae of this inspection found that Biodentine shows least leakage compared to MTA and PC. Conclusion Biodentine shows less microleakage compared to MTA and PC.

Temulawak (Curcuma  xanthorrhizaRoxb.) belongs to the family Zingiberaceae, has been empirically used as herbal medicines. The research was aimed to evaluate three promising lines of Temulawak based on their high bioactive contents (xanthorrhizol and curcuminoid) and its in vitro bioactivity (antioxidant and toxicity), and to obtain information on agrobiophysic environmental condition which produced high bioactive compounds. The xanthorrhizol and curcuminoid contents were measured by HPLC. In vitro antioxidant and toxicity were determined by DPPH (1,1-diphenyl-2-picryl-hydrazyl) method and BSLT (Brine Shrimp Lethality Test). The result showed that promising line A produced the highest yield of bioactive and bioactivity, i.e. 0.157 and 0.056 g plant-1of xanthorrizol and curcuminoid respectively. The IC50 of antioxidant activity was 65.09 mg L-1and LC50of toxicity was 69.05 mg L-1. In this study, Cipenjo had the best temulawak performance than two other locations. According to the agrobiophysic parameters, Cipenjo environmental condition was suitable for temulawak cultivation with temperature 28-34 ºC, rainfall ± 223.97 mm year-1 and sandy clay soil. Keywords: antioxidant, curcuminoid, promising lines, temulawak, xanthorrhizol

1970 ◽  
Vol 40 (2) ◽  
Author(s):  
Waras Nurcholis ◽  
Edy Djauhari Purwakusumah ◽  
Mono Rahardjo ◽  
Latifah K. Darusman
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Brine Shrimp ◽  
Clay Soil ◽  
Herbal Medicines ◽  
Environmental Condition ◽  
In Vitro Bioactivity ◽  
The Family ◽  
Promising Line

Temulawak (Curcuma  xanthorrhizaRoxb.) belongs to the family Zingiberaceae, has been empirically used as herbal medicines. The research was aimed to evaluate three promising lines of Temulawak based on their high bioactive contents (xanthorrhizol and curcuminoid) and its in vitro bioactivity (antioxidant and toxicity), and to obtain information on agrobiophysic environmental condition which produced high bioactive compounds. The xanthorrhizol and curcuminoid contents were measured by HPLC. In vitro antioxidant and toxicity were determined by DPPH (1,1-diphenyl-2-picryl-hydrazyl) method and BSLT (Brine Shrimp Lethality Test). The result showed that promising line A produced the highest yield of bioactive and bioactivity, i.e. 0.157 and 0.056 g plant-1of xanthorrizol and curcuminoid respectively. The IC50 of antioxidant activity was 65.09 mg L-1and LC50of toxicity was 69.05 mg L-1. In this study, Cipenjo had the best temulawak performance than two other locations. According to the agrobiophysic parameters, Cipenjo environmental condition was suitable for temulawak cultivation with temperature 28-34 ºC, rainfall ± 223.97 mm year-1 and sandy clay soil. Keywords: antioxidant, curcuminoid, promising lines, temulawak, xanthorrhizol

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