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Polymerization shrinkage by investigation of uv curable dental restorative composites containing multifunctional methacrylates

100%
Świderska J., Czech Z., Kowalczyk A.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 2
81-85
EN
Typical commercial restorative dental compositions in the form of medical resins contain in-organic fillers, multifunctional methacrylates and photoinitiators. The currently used resins for direct composite restoratives have been mainly based on acrylic chemistry to this day. The main problem with the application and radiation curing process is the shrinkage of photoreactive dental materials during and after UV curing. Shrinkage of restorative radiation curable dental composites is a phenomenon of polymerization shrinkage, typical behavior of multifunctional methacrylates during the polymerization process. The important factors in curing of dental composites are: the kind and concentration of the used methacrylate, its functionality, double bond concentration, the kind and concentration of the added photoinitiator and UV dose emitted by the UV-lamp. They are investigated multifunctional 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), triethylene glycol dimethacrylate (TEGDMA), trimethylolpropane trimethacrylate (TMPTMA), 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl) phenyl]propane (Bis-GMA), ethoxylated Bis-GMA (EBPDMA) and dodecandiol dimethacrylate (DDDMA). Reduction of polymerization shrinkage of restorative dental compositions is at the moment a major problem of dental technology. This problem can be solved through an application of photoreactive non-tacky multifunctional methacrylates in the investigated dental adhesive fillings.
2
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Acrylic Pressure-Sensitive Adhesives Containing SiO2Nanoparticles

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Czech Z., Kowalczyk A., Ortyl J., Świderska J.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 1
12-14
EN
The use of acrylic pressure-sensitive adhesives (PSAs) is increasing in a variety of industrial fields. They have been applied in the manufacture of mounting tapes, self-adhesive labels, protective films, masking tapes, splicing tapes, carrier-free tapes, sign and marking films, and in diverse medical products, such as pads or self-adhesive bioelectrodes. In this study, the application of SiO2 nanoparticles in acrylic PSA was investigated. The properties of the newly synthesized and modified PSA were evaluated via the tack, peel adhesion, shear-strength and shrinkage. It has been found that the nanotechnologically-reinforced systems consisting of monodisperse non-agglomerated SiO2 nanoparticles and self-crosslinked acrylic PSAs showed a great enhancement in tack, peel adhesion, shear resistance and shrinkage, without showing the disadvantages known to result from the use of other inorganic additives. In this paper we evaluate the performance of SiO2 nanoparticles with a size of about 30 nm as inorganic filler into the synthesized solvent-borne acrylic PSA.
3
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Reducing of on Polymerization Shrinkage by Application of UV Curable Dental Restorative Composites

100%
Świderska J., Czech Z., Świderski W., Kowalczyk A.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 3
51-55
EN
This manuscript describes dental compositions contain in-organic fillers, multifunctional methacrylates and photoinitiators. The main problem by application and UV curing process is the shrinkage of photoreactive dental materials during and after UV curing process. Total shrinkage of UV curable dental composites is a phenomenon of polymerization shrinkage, typical behavior for multifunctional methacrylates during polymerization process. The important factors by curing of dental composites are: kind and concentration of used methacrylates, their functionality, double bond concentration, kind and concentration of added photoinitiator and UV dose. They are investigated UV-curable dental compositions based on 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl)phenyl]propane (Bis-GMA) and containing such multifunctional monomers as 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), tetraethylene glycol dimethacrylate (T3EGDMA), trimethylolpropane trimethacrylate (TMPTMA), polyethylene glycol 200 dimethacrylate (PEG200DA). Reduction of polymerization shrinkage of dental compositions is at the moment a major problem by dental technology.
4
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Nadwrażliwość na preparaty cyklosporyny u dzieci z wrzodziejącym zapaleniem jelita grubego - opis dwóch przypadków

100%
Kowalczyk A., Tunowska D., Krogulska A.
Alergia Astma Immunologia - przegląd kliniczny
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2018
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vol. 23
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issue 3
160-164
EN
Ciclosporin is an immunosuppressive drug that is used in many fields of medicine, including e.g. gastroenterology in the treatment of inflammatory bowel diseases. Hypersensitivity reactions to cyclosporin medicines are rare and may be related to the drug's additional component - polyethyloxylated castor oil . In this paper, we present a case report of a 10-year-old girl and a 7-year-old boy who were both treated with cyclosporin because of ulcerative colitis. During the course of therapy we observed cutaneous and systemic reactions which may suggest hypersensitivity to the drug. The cases of both allergic and non-allergic hypersensitivity to cyclosporin medicines described in the literature are also presented.
PL
Cyklosporyna jako lek immunosupresyjny jest wykorzystywana w wielu dziedzinach medycyny w tym w gastroenterologii w terapii nieswoistych zapaleń jelit. Reakcje nadwrażliwości na preparaty cyklosporyny występują rzadko i mogą mieć związek ze składnikiem dodatkowym leku - polioksyetylowanym olejem rycynowym. W niniejszej pracy przedstawiamy opis przypadków 10-letniej dziewczynki oraz 7-letniego chłopca leczonych w naszej Klinice preparatami cyklosporyny z powodu wrzodziejącego zapalenia jelita grubego. U dzieci w trakcie terapii obserwowano objawy kliniczne, pod postacią reakcji skórnej i ogólnoustrojowej, mogące sugerować nadwrażliwość na lek. Przedstawiono także opisywane w literaturze przypadki zarówno alergicznej, jak i niealergicznej nadwrażliwości na preparaty cyklosporyny.
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Electrically conductive acrylic pressure-sensitive adhesives containing carbon black

88%
Czech Z., Pełech R., Kowalczyk A., Kowalski A., Wróbel R.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 4
77-81
EN
Acrylic pressure-sensitive adhesives (PSA) are non electrical conductive materials. The electrical conductivity is incorporated into acrylic self-adhesive polymer after adding electrically conductive additives like carbon black, especially nano carbon black. After an addition of electrical conductive carbon black, the main and typical properties of pressure-sensitive adhesives such as tack, peel adhesion and shear strength, are deteriorated. The investigations reveals that the acrylic pressure-sensitive adhesives basis must be synthesised with ameliorated initial performances, like high tack, excellent adhesion and very good cohesion. Currently, the electrical conductive solvent-borne acrylic PSA containing carbon black are not commercially available on the market. They are promising materials which can be applied for the manufacturing of diverse technical high performance self-adhesive products, such as broadest line of special electrically conductive sensitive tapes.
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Porównanie metody endoskopowej i klasycznej w leczeniu torbieli pajęczynówki i guzów wewnątrzkomorowych

88%
Błaszczyk B., Michalak A., Kowalczyk A., Suszyński K., Kwiek S. J.
Annales Academiae Medicae Silesiensis
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2014
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vol. 68
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issue 5
268-274
EN
INTRODUCTION Endoscopic operations are classified as minimally invasive procedures. It means that the traumatization of skin, bone and brain tissue is reduced to a minimum. The endoscopic technique is used especially in the case of intraventricular system pathology or when precise manipulations in deep structures are to be performed (e.g. excising part of arachnoid cyst and its communication with arachnoid cisterns or ventriculostomy). The endoscopic method in Polish neurosurgery departments is still not widespread, therefore knowledge about the legitimacy of its use and effectiveness requires discussion and popularization. MATERIAL AND METHODS We have analyzed immediate and long-term results of treatment,operation time, postoperative hospitalization time, and complications in 62 patients operated on in the Department of Neurosurgery. Among them 25 were treated using an endoscope and 37 had a classical operation performed. The patients were divided into two groups according to the kind of treatment and pathology. RESULTS According to our observation, the mean operation time for tumors of the third ventricle was markedly shorter in the endoscpic operation (mean 119 minutes, median 102 minutes vs. mean 280 and median 265 minutes in classical operation). The mean hospitalization time was 25 days using the endoscopic vs. 33 in the classic method. In both methods we obtained improvement of the clinical state, which was higher in the endoscopic method. Similar results were observed in patients operated on for lateral ventricle tumors, or arachnoid cysts. CONCLUSION The endoscopic method is an effective and minimally invasive technique which might be applied in the treat- ment of brain disorders. The use of this modern technology shortens the treatment time and duration of ostoperative hospitalization. The effectiveness of the endoscopic method is comparable to the classical method, but the former is associated with fewer complications.
PL
WSTĘP Operacje endoskopowe należą do grupy zabiegów tzw. minimalnie inwazyjnych, co oznacza, że traumatyzacja powłok i tkanki mózgowej ograniczona jest do minimum. Technikę endoskopową stosuje się zwłaszcza w przypadkach patologii układu wewnątrzkomorowego (w których dojście klasyczne wiąże się z koniecznością przechodzenia przez zdrową tkankę) oraz gdy zachodzi potrzeba wykonania jedynie niewielkich manipulacji w obszarach zlokalizowanych głęboko (np. wycięcie części torbieli ściany pajęczynówki i połączenie jej ze zbiornikami pajęczynówki). Metoda endoskopowa w polskich oddziałach neurochirurgii nadal nie jest szeroko rozpowszechniona, tak więc wiedza co do zasadności jej zastosowania i skuteczności wymaga omawiania i popularyzacji. MATERIAŁY I METODY Analizie poddano wyniki leczenia bezpośrednie i odległe, czas operacji, okres hospitalizacji oraz powikłania u 62 pacjentów leczonych chirurgicznie w Klinice Neurochirurgii SUM w Katowicach. Wśród nich było 25 leczonych endoskopowo i 37 leczonych klasycznie. Chorych podzielono na dwie zasadnicze grupy, co do patologii i rodzaju zabiegu. WYNIKI W naszych analizach średni czas operacji pacjentów z guzem komory trzeciej był przy zastosowaniu metody endoskopowej (średnio 119 min, mediana 102 min) znacznie krótszy niż w metodzie klasycznej (średnio 280 min, mediana 265 min). Średni czas hospitalizacji pacjentów leczonych metodą endoskopową wynosił 25 dni, a pacjentów leczonych metodą klasyczną 33 dni. W obu metodach uzyskaliśmy poprawę stanu klinicznego, choć w grupie leczonych metodą endoskopową zaobserwowano mniejszą liczbę powikłań. Podobne wyniki uzyskano w grupie chorych leczonych z powodu torbieli pajęczynówki. WNIOSKI Metoda endoskopowa jest skuteczną i małoinwazyjną technika mogącą mieć zastosowanie w leczeniu schorzeń mózgu. Jej zastosowanie skraca czas zabiegu oraz czas hospitalizacji pooperacyjnej. Skuteczność metod endoskopowej klasycznej jest porównywalna, jednak pierwsza wiąże się z mniejszą liczbą powikłań.
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Influence of the unsaturated photoinitiators kind on the properties of uv-crosslinkable acrylic pressure-sensitive adhesives

76%
Czech Z., Kowalczyk A., Górka K., Głuch U., Shao L., Świderska J.
Polish Journal of Chemical Technology
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2012
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vol. 14
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issue 3
83-87
EN
UV-crossinkable pressure-sensitive adhesives (PSA) materials are called, in the adhesives trade photoreactive self-adhesive. UV-crosslinkable PSAs are designed after the UV-initiated crosslinking reaction to stick to almost any surface by a simple contact under light pressure. This special class of adhesives does not undergo any physical transformation or chemical reaction during the bonding process. Because of the rheological properties the adhesive must be fi nely tuned for the application, combining a carefully chosen polymer architecture and monomer composition with the proper addition of small additives called photoinitiators. The best way is using the unsaturated copolymerizable photoinitiators and their direct incorporation into polymer chain during the polymerization process. Progress in the coating technology and the development of novel photoreactive acrylic adhesives will open the door to new applications and an extended market penetration of UV-crosslinkable acrylic adhesive raw materials containing unsaturated copolymerizable photoinitiators incorporated into the polymer backbone. Photoreactive UV-crosslinkable acrylic PSA are characterized by good tack, good adhesion, excellent cohesion and very low shrinkage.
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