Abstract:
PURPOSE:The purpose of this study was to test the influence of a barbituric acid derivative acting as a catalyst and small amounts of pyrolytic silica in acrylic resins on color stability, solubility and sorption of a composite. MATERIALS AND METHODS:A series of two-component powder/liquid resin systems were prepared. Monomer-like mixtures (bis-GMA, TEGDMA, tertiary amine 60/40) and a quartz powder with additions of various silica and barbituric acid derivatives were used. Temperature of the material during polymerization was measured with the use of a thermometer. In addition, the material's flexural and compressive strength, sorption and solubility were tested pursuant to ISO4049:2009. RESULTS:The powder-based acrylic composition in a liquid mixed immediately before use, after an addition of a 0.5% barbituric acid derivative, has a lower temperature during the polymerization process (a reduction from 43°C to 37°C), whereas color stability over time is improved, with ΔE=1.81 for samples of powder mixtures containing between 0.45% of BPO and 0.15% of barbituric acid derivatives. For silanized quartz powder with 0.55% BPO and 0.1% BA+0.5% Aerosil R711, the obtained sorption value was 4.57±0.22μg/mm3, whereas solubility was 1.60±0.32μg/mm3. CONCLUSIONS:New catalytic system with barbituric acid derivative, improves color stability for samples stored at room condition and under light of high intensity. A two-phase composite (bis GMA TEGDMA/Quartz), with a new catalytic system with barbituric acid derivatives, has a lower self-cured temperature. Adding a small quantity of hydrophobic silica (0.5%) has a significant influence, with reduced sorption and solubility of the material.
journal_name
Adv Med Scijournal_title
Advances in medical sciencesauthors
Raszewski Z,Jałbrzykowski Mdoi
10.1016/j.advms.2017.04.006subject
Has Abstractpub_date
2017-09-01 00:00:00pages
398-404issue
2eissn
1896-1126issn
1898-4002pii
S1896-1126(17)30039-1journal_volume
62pub_type
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journal_title:Advances in medical sciences
pub_type: 杂志文章
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abstract:PURPOSE:In recent years, many reports have focused on clinical changes in the oral cavity of orthodontic patients, manifested in general inflammation of the mucosa. In order to better understand histopathological alterations in the mouth and the use of easily available diagnostic material, we decided to assess the morp...
journal_title:Advances in medical sciences
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abstract:PURPOSE:NT-proBNP and BNP concentrations in CHF correlate with NYHA class and LVEE Little research has been conducted to compare the clinical performance of these two natriuretic peptides in heterogeneous CHF population. Purpose: to evaluate and compare the clinical performance of NT-proBNP and BNP in heterogeneous gro...
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更新日期:2011-01-01 00:00:00
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journal_title:Advances in medical sciences
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doi:10.1016/j.advms.2018.04.005
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abstract:PURPOSE:Accumulating evidence has linked long noncoding RNAs (lncRNAs) to autoimmune and inflammatory disorders. This study aimed to detect the expression levels of five lncRNAs (lnc0640, lnc3643, lnc5150, lnc7514 and lncagf) in peripheral blood mononuclear cells (PBMCs) of patients with systemic lupus erythematosus (S...
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journal_title:Advances in medical sciences
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journal_title:Advances in medical sciences
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journal_title:Advances in medical sciences
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journal_title:Advances in medical sciences
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更新日期:2007-01-01 00:00:00
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更新日期:2009-01-01 00:00:00
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journal_title:Advances in medical sciences
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journal_title:Advances in medical sciences
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更新日期:2020-09-01 00:00:00
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journal_title:Advances in medical sciences
pub_type: 杂志文章,随机对照试验
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更新日期:2013-01-01 00:00:00
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journal_title:Advances in medical sciences
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journal_title:Advances in medical sciences
pub_type: 杂志文章
doi:
更新日期:2007-01-01 00:00:00