Fluoride Release from Composite Materials for Dental Fillings

2008 ◽  
Vol 144 ◽  
pp. 27-32
Author(s):  
Joanna Mystkowska
Keyword(s):  
Composite Materials ◽  
Phosphate Buffer ◽  
Fluoride Release ◽  
Selective Electrode ◽  
Direct Potentiometry ◽  
Dental Fillings ◽  
Powder Filler ◽  
Fluoride Emission ◽  
Wear Tests ◽  
Ytterbium Fluoride

Fluoride release from composite materials for dental fillings depending on the type of powder filler and dynamical loading is the main problem considered in the paper. The fillers used for research were fluoridated glass (based on Ba-Sr-Al-P-Na-silicate glass), ytterbium fluoride (YbF3) as a fluoride source and nanosilica. In order to estimate the influence of the usage loading value on fluoride release from analyzed samples, the wear tests were carried out by means of special tribotester in presence of phosphate buffer as a lubricant. After friction processes the fluoride release tests were performed in phosphate buffer using direct potentiometry method with fluoride selective electrode. The fluoride emission was analyzed on the basis of: 1) type and amount of fillers powder, 2) using loading. Surface roughness was also investigated. The surface of each composite was analyzed by means of SEM.

Fluoride Release and Antibacterial Activity of Self-Made Composite Materials for Dental Fillings

2009 ◽  
Vol 147-149 ◽  
pp. 801-806 ◽  
Author(s):  
Joanna Mystkowska ◽  
Grażyna Marczuk-Kolada ◽  
Katarzyna Leszczyńska ◽  
Jan Ryszard Dąbrowski ◽  
Joanna Karaś
Keyword(s):  
Antibacterial Activity ◽  
Composite Materials ◽  
Bacterial Strains ◽  
Diffusion Test ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
Direct Potentiometry ◽  
Dental Fillings ◽  
Agar Diffusion Test ◽  
Fluoride Ion Selective Electrode

In the paper own prepared materials with addition fluorine sources were evaluated. The aim of the study was to assess the quality and quantity of fluoride source on fluoride ions release from composite materials. Antibacterial activity of analyzed materials in relation to four bacteria was investigated. Fluoride ions release was measured by direct potentiometry method with fluoride ion selective electrode. The measurements were carried out after 1, 4, 7, 14, 30, 60 days of storage in buffer at pH 6.8. The antibacterial activity of the materials was evaluated against standard bacterial strains using the agar diffusion test. Tests show that the highest level of fluoride ions emission was observed for composite with fluoridated glass (material A) on the seventh day of the study. Similar fluoride ions amount was released from material consisted of fluoridated glass and ytterbium fluoride (material C), but not until on the thirtieth day of the study. After 24 hours of composite bonding there was inhibition of bacterial growth by composite C, whereas composite A did not show similar activity. On the eighth day after polymerization, both materials were significantly more active towards two bacteria.

Mechanical and Physicochemical Properties of Some Originally Made Composite Materials for Dental Fillings

2010 ◽  
Vol 165 ◽  
pp. 142-146
Author(s):  
Joanna Mystkowska ◽  
Gabriel Rokicki ◽  
Jarosław Sidun ◽  
Jan Ryszard Dąbrowski
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Physicochemical Properties ◽  
Water Sorption ◽  
Mechanical Characteristics ◽  
Ion Source ◽  
Fluoride Ion ◽  
Strontium Fluoride ◽  
Dental Fillings ◽  
Ytterbium Fluoride

This work presents results of research on compressive strength, microhardness, polymerization shrinkage and water sorption of some specially developed composite materials for dental fillings. The investigated powder fillers were divided into two groups: fluorine-based fillers, such as fluoridated glass, strontium fluoride, ytterbium fluoride and additives of improved mechanical characteristics such as nanosilica and polyethylene. The influence of fluoride ion source on the properties of the composite materials was evaluated. Tests were performed just after the material polymerization and, additionally, after seven, thirty and sixty days. Some small differences between composites were observed.

The Influence of Selected Powder Fillers on the Tribological Properties of Composite Materials for Dental Fillings

2008 ◽  
Vol 144 ◽  
pp. 33-38 ◽  
Author(s):  
Joanna Mystkowska ◽  
Jan Ryszard Dąbrowski
Keyword(s):  
Composite Materials ◽  
Tribological Properties ◽  
Tribological Behavior ◽  
Organic Matrix ◽  
Friction Modifiers ◽  
Dental Fillings ◽  
Ptfe Composite ◽  
Materials Used ◽  
Glass Fillers ◽  
Wear Tests

The aim of this study was to determine the influence of powder fillers on the tribological properties of composite materials used for dental fillings. The investigated composites contain a fluoridated filler (based on Ba-Sr-Al-P-Na-silicate glass fillers) as a fluoride source as well as different powder fillers (friction modifiers) e.g. silicon nitride (Si3N4), boron nitride (BN), polyethylene (PE), polytetrafluoroethylene (PTFE). Composite disks were photo-cured and tested for wear against harder stainless-steel counterface. Wear tests were carried out by means of special tribotester in the presence of phosphate buffer as a lubricant. Influence of the load and filler contents on the friction coefficients and wear were estimated. The interaction between the filler particles and organic matrix and its influence on the tribological behavior of prepared specimens were observed. Organic powder fillers (PE, PTFE) reduced the friction coefficient and the wear of tested composite materials for dental fillings. Inorganic friction modifiers (Si3N4, BN) did not exhibit this effect.

scholarly journals Preparation, Characterization, and Analytical Application of Ramipril Membrane-Based Ion-Selective Electrode

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Hassan Arida ◽  
Mona Ahmed ◽  
Abdallah Ali
Keyword(s):  
Pharmaceutical Formulations ◽  
Ion Pair ◽  
Pvc Membrane ◽  
Ion Selective Electrodes ◽  
Selective Electrode ◽  
Response Sensitivity ◽  
Direct Potentiometry ◽  
Plasticized Pvc ◽  
Electrochemical Evaluation

The fabrication and electrochemical evaluation of two PVC membrane-based Ion-Selective electrodes responsive for ramipril drug have been proposed. The sensitive membranes were prepared using ramipril-phosphomolibdate and ramipril-tetraphenylborate ion-pair complexes as electroactive sensing materials in plasticized PVC support. The electrodes based on these materials provide near-Nernestian response (sensitivity of53±0.5–54±0.5 mV/concentration decade) covering the concentration range of1.0×10-2–1.0×10-5 molL−1with a detection limit of3.0×10-6–4.0×10-6 molL−1. The suggested electrodes have been successfully used in the determination of ramipril drug in some pharmaceutical formulations using direct potentiometry with average recovery of >96% and mean standard deviation of <3% (n=5).

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