Wyniki wyszukiwania - Biblioteka Nauki

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Contemporary aesthetic restorative dental composite materials

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Malara P. , Świderski W.

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tom Vol. 78, nr 1

32--40

EN

Purpose: This is a review paper that gives an insight into the most popular group of aesthetic dental materials - dental composite materials. This article describes the historical background, the main features of this group of materials, the cathegorization of the materials in relation to clinical applications and the polymerization proces. Design/methodology/approach: This review is based on the contemporary scientific literature most relevant to the topic. The literature search has been made in Elsevier - Science Direct. Findings: Light-curing dental composites exhibit some resemblance to the construction of the hard tissues of the tooth. They also consist of two basic components. These are: an organic matrix and an inorganic filler. The third component, which is regularly added, is so-called "binding agent". According to the composition of the materials they make a good choice for aesthetic restoration in natural dentition. Practical implications: In the clinical observations there are many complications resulting from inadequate polymerization of composite materials. This may be the result of poor quality of curing lights of a very low intensity, too long distance between the tip of the lamp and the surface of the material or improper exposure time Originality/value: Dental composite materials are the only group of dental materials in which these features are combined together, ensuring naturally looking final effect of the restoration. Easy handling of the dental composite materials together with effective polymerization process with portable light units make these materials a good choice for clinical use.

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Zastosowanie ilorazow stezen pierwiastkow w ocenie ich metabolizmu w zebach osob narazonych srodowiskowo na metale

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Malara P. , Kwapulinski J. , Malara B. , Drugacz J.

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nr Supl.

53-55

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Badania wytrzymałości na ściskanie fotoreaktywnych wypełnień stomatologicznych utwardzanych światłem widzialnym

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Świderski W. , Czech Z. , Malara P.

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tom T. 93, nr 12

2214-2217

PL

Utwardzano kompozyty stomatologiczne na bazie żywic epoksydowych, uretano-akrylanowych oraz akrylanowych zawierających oligomer 2,2-bis[4(2-hydroksy-3-metakryloglicerylo)fenolowy], dimetakrylan uretanowy, wielofunkcyjny akrylan, fotoinicjator kamforochinon oraz koinicjator 4-dimetylo-aminobenzoesan etylu, stosując światło widzialne emitowane przez polimeryzacyjną lampę LED. Jako napełniacz zastosowano hydroksyapatyt. Przeprowadzono badania wytrzymałości na ściskanie badanych fotoreaktywnych kompozytów stomatologicznych, porównując je z wytrzymałością utwardzanych światłem widzialnym wybranych komercyjnych kompozytów stomatologicznych.

EN

Oligomeric 2,2-bis[4(2-hydroxy-3-methacrylglyceril)phenol] Bis-GMA, an urethane dimethacrylate, a multifunctional acrylat, camphoroquinone photoinitiator and Et 4-dimetyl-aminobenzoate co-initiator were compounded and cured by using visible light from a light-emitting diode. Hydroxyapatite was used as a filler. The photoreactive dental composites were studied for compression strength by a std. method. The composites were as good as com. ones.

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Dynamics of changes in vascular endothelial growth factor (VEGF) expression and angiogenesis in stress-induced gastric ulceration in rats

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Malara B. , Josko J. , Tyrpien M. , Malara P. , Steplewska K.

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nr 2

EN

Angiogenesis and VEGF play a major role in many repair processes such as healing of gastric ulceration.The present study was undertaken to assess the dynamics of changes in VEGF expression and angiogenesis in stress-induced gastric ulcers in rats. Acute gastric ulceration was induced using a water-immersion and restraint stress method. The VEGF expression, angiogenesis, size of area and depth of ulcers in gastric speciments were evaluated. The study shows that as early as one day after the development of ulcers there is a significant increase in both the expression of the VEGF protein and the number of newly formed microvessels, while an abrupt decrease in VEGF expression, observed on the fifth day, results in a decreased intensity of angiogenesis. Moreover, it has been demonstrated that the increase in VEGF expression and angiogenesis is accompanied by a reduction in the size of area and depth of stress-induced ulcers in rats. Six days after ulcer development both VEGF expression and angiogenesis return to normal levels.

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Influence of the Light Source and Curing Parameters on Microhardness of a Silorane-Based Dental Composite Material

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Malara P. , Czech Z. , Świderski W.

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