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

2019 ◽  
Author(s):  
Yiyu Li
Keyword(s):  
Flexural Strength ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Maturation Time ◽  
Setting Times ◽  
Incubation Periods ◽  
Initial Characterization ◽  
Strontium Incorporation ◽  
Glass Compositions

AbstractIn 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. The compressive strength of the cements increased as a function of incubation time, with the strontium containing compositions showing the highest strength at 34 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 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.

An in vitro evaluation of bond strength of three glass ionomer cements

1990 ◽  
Vol 97 (4) ◽  
pp. 316-322 ◽  
Author(s):  
Valerie Bowser Fajen ◽  
Manville G. Duncanson ◽  
Ram S. Nanda ◽  
G. Frans Currier ◽  
Padmaraj V. Angolkar
Keyword(s):  
Bond Strength ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
In Vitro Evaluation

scholarly journals Bond Strength of Self-Adhesive Flowable Composites and Glass Ionomer Cements to Primary Teeth: A Systematic Review and Meta-Analysis of In Vitro Studies

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6694
Author(s):  
Flavia Iaculli ◽  
Alessandro Salucci ◽  
Gianni Di Giorgio ◽  
Valeria Luzzi ◽  
Gaetano Ierardo ◽  
...  
Keyword(s):  
Systematic Review ◽  
Bond Strength ◽  
Primary Teeth ◽  
Meta Analysis ◽  
Deciduous Teeth ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Flowable Composites

Background: Conventional composites are largely used in pediatric restorative dentistry and demonstrate successful clinical outcomes. However, the need for simplification of operative steps in young or uncooperative children demands reliable alternatives. Therefore, the aim of the present systematic review and meta-analysis was to evaluate the in vitro bond strength of glass ionomer cements (GICs) and self-adhesive flowable composites (SFCs) on deciduous teeth. Methods: A comprehensive literature search according to the PRISMA checklist was manually and electronically performed by two independent reviewers through the following databases: MEDLINE/PubMed, Google Scholar, Scopus, and Embase, to include in vitro studies comparing GICs and SFCs bond strength values of restorations on primary teeth. In addition, three groups of meta-analyses were conducted using random-effects models. Results: Three articles meeting the inclusion criteria were selected and subjected to both qualitative and quantitative assessment. No statistically significant difference was found between SFC versus GIC; however, both groups significantly differed with conventional flowable composites (CFs). Conclusions: Despite the absence of significant difference in bond strength values, SFCs may be considered a valid alternative to GICs in the restoration of deciduous teeth, although CFs proved better in vitro performances.

scholarly journals Materiais Promissores para Melhorar as Propriedades Mecânicas e Físico-Químicas do Cimento de Ionômero de Vidro

2018 ◽  
Vol 19 (5) ◽  
pp. 104 ◽  
Author(s):  
M R R Silva ◽  
N J C Sena ◽  
D A Cunha ◽  
L C Souza ◽  
N S Rodrigues ◽  
...  
Keyword(s):  
Dental Materials ◽  
Dental Composite ◽  
Glass Ionomer Cements ◽  
Glass Ionomer

O objetivo deste trabalho é realizar uma revisão de literatura sobre os materiais que estão sendo associados ao cimento de ionômero de vidro (CIV), visando melhorar suas propriedades mecânicas e físico-químicas. Foi realizada uma seleção de artigos científicos nas bases de dados PubMed, Europe PMC e ScienceDirect, usando os descritores Glass Ionomer Cements, Dental Materials e Dental Composite. O critério de inclusão foi estudo in vitro acerca do tema proposto e os de exclusão foram revisões de literatura e estudos clínicos. Foram encontrados 130 artigos, publicados entre os anos de 2012 a 2017, dos quais foram selecionados 10. De acordo com esta revisão, o uso de substâncias naturais, tais como os nanocristais de celulose, melhorou a resistência à compressão e diametral, módulo de elasticidade e resistência ao desgaste do CIV. Já a associação com o propólis resultou na diminuição significativa da resistência à compressão e o aumento da solubilidade do CIV. O uso das nanopartículas de AlO, ZrO e TiO2 foi avaliado, mostrando redução da porosidade dos cimentos ionoméricos e aumento da resistência à compressão. Quando o Nanoclay (montmorillonita de grau polimérico) foi adicionado à porção líquida do CIV, suas propriedades mecânicas melhoraram, entretanto a resistência à tensão diametral não apresentou melhora estatística significante. Portanto, o uso de substâncias associadas ao CIV mostrou melhora de suas propriedades, principalmente quando os nanocristais de celulose foram utilizados, podendo representar um novo e promissor material de restauração dentária.Palavras-chave: Cimentos de Ionômeros de Vidro. Materiais Dentários. Propriedades Físicas e Químicas.

scholarly journals Influence of Luting Materials on the Retention of Cemented Implant-Supported Crowns: An In Vitro Study

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1853 ◽  
Author(s):  
Ella Naumova ◽  
Felix Roth ◽  
Berit Geis ◽  
Christine Baulig ◽  
Wolfgang Arnold ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Storage Conditions ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Cobalt Chromium ◽  
Retention Force ◽  
Implant Abutments ◽  
Aging Conditions

The retention force of cemented crowns on implant abutments with various luting materials was evaluated. Cobalt–chromium crowns were cemented onto tapered titanium abutments (Camlog) with eugenol-free temporary cement (RelyX TempBond NE), composite-based temporary cement (Bifix Temp), zinc phosphate cement (Harvard Cement), glass-ionomer cements (Meron, Fuji I), and resin-modified glass-ionomer cements (Fuji II, Fuji Plus, Ketac Cem Plus). Specimen aging via hydrostress was performed in artificial saliva at 37 °C for 14 days (S1), followed by hydrothermal stress with thermocycling (S2). The crowns were removed, and the force was recorded (T1). Subsequently, the crowns were recemented, aged, and removed, and the force was recorded (T2, T3). The retention forces differences were statistically significant according to the storage conditions at T1 (p = 0.002) and T3 (p = 0.0002). After aging (S1), Ketac Cem Plus had the highest retention force median value difference (T3 versus T1) (−773 N), whereas RelyX TempBond NE had the lowest (−146 N). After aging (S2), Meron had the highest retention force median value difference (−783 N), whereas RelyX TempBond NE had the lowest (−168 N). Recementation decreased the retention force of the implant-supported cobalt–chromium crowns cemented and recemented with the same luting materials. Luting materials (at T1) and aging conditions significantly impacted the retention force.

scholarly journals A COMPARATIVE EVALUATION OF MICROLEAKAGE, COMPRESSIVE STRENGTH, FLEXURAL STRENGTH AND FLUORIDE RELEASE OF ZIRCONOMER AND KETAC SILVER: AN IN VITRO STUDY.

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
CHARANTEJA VEMAGIRI ◽  
Uloopi KS ◽  
Vinay Chandrappa ◽  
Anusha Ch
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
Biological Properties ◽  
T Test ◽  
Fluoride Release ◽  
Restorative Material ◽  
Glass Ionomer

Background: A successful restorative material forms a better adhesion, resist the microleakage and releases fluoride. However, existing glass ionomer cements cannot be used as a posterior restorative material in stress bearing areas. A new ionomer called Zirconomer, zirconia reinforced glass ionomer claims to exhibit high physical and biological properties. Aim: To assess and compare the microleakage, compressive strength, flexural strength and fluoride release from zirconomer with ketac silver. Materials & Methods: On twenty caries free premolar teeth (10 per each group), a class v cavity was restored with zirconomer and ketac silver. The microleakage was assessed using dye penetration test and stereomicroscope. The compressive and flexural strengths of these materials were measured using Instron Universal testing machine. The amount of fluoride released from the modified ionomers at pH 5 and pH 7 was estimated using Orion fluoride specific electrode. The obtained data was then subjected to statistical analysis. Results: Data was analysed using paired t-test for intergroup comparisons and unpaired t-test for intragroup comparisons. The overall microleakage (0.5±0.48) of zirconomer was significantly less (p=0.000) compared to ketac silver (1.9±0.83). Zirconomer demonstrated a significant higher compressive strength (330.25±60.14), flexural strength (33.058±2.36) than ketac silver (p= 0.000). Zirconomer demonstrated high fluoride release from day 1 to day 7 at both pH 5 and pH 7. Conclusion: Zirconomer demonstrated better physical and biological properties compared with ketac silver.

An in-vitro assessment of weekly cumulative fluoride release from three glass ionomer cements used for orthodontic banding

2012 ◽  
Vol 13 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Elaheh Vahid-Dastjerdi ◽  
Ali Borzabadi-Farahani ◽  
Homa Pourmofidi-Neistanak ◽  
Nazila Amini
Keyword(s):  
Fluoride Release ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
In Vitro Assessment
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