Wyniki wyszukiwania - BazTech

1

Ocena wpływu fotopolimeryzacji na mikrotwardość kompozytów typu bulk-fill

Pieniak Daniel, Niewczas Agata M., Gil Leszek, Krzysiak Zbigniew

Przemysł Chemiczny

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2024

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T. 103, nr 3

391--394

PL

Przedstawiono wyniki badań mikrotwardości trzech powszechnie stosowanych kompozytów handlowych typu bulk-fill. Celem pracy była ocena wpływu fotopolimeryzacji próbek o grubości nominalnej 2 mm na wytrzymałość stykową powierzchni. Wytrzymałość stykową oceniano w testach mikrotwardości metodą Vickersa. Badano mikrotwardość na powierzchniach naświetlanej (LC) i nienaświetlanej (NLC) lampą stomatologiczną UV. W badaniach wykorzystano lampę z funkcją soft start. Próbki przed badaniem mikrotwardości kondycjonowano w sztucznej ślinie w temp. 36,7°C. Wyniki badań poddano analizie statystycznej. W przypadku jednego kompozytu B-F wykazano brak istotnych różnic mikrotwardości na powierzchni LC i NLC. Mikrotwardość kompozytów TPF i EU na powierzchni NLC była istotnie większa niż na LC. Ponadto różnica mikrotwardości powierzchni LC i NLC kompozytu EU była największa.

EN

Samples of 3 com. bulk-fill dental composites were tested for Vickers microhardness to det. the effect of photopolymn. of samples with a nominal thickness of 2 mm on the surface contact strength. Microhardness was tested on surfaces exposed (LC) and not exposed (NLC) to a UV dental lamp. Before testing the microhardness, the samples were conditioned in artificial saliva at 36.7°C. The research results were statistical analyzed. In 2 of 3 tested composites, significantly higher microhardness was found on the NLC surface than on the LC surface.

2

Wpływ dodatku krzemionki na wybrane właściwości tworzywa akrylowego stosowanego w konstrukcjach protetycznych

Kujawiak-Bartkiewicz Katarzyna, Kolasiński Karol, Krasowski Michał, Bociong Kinga, Sokołowski Jerzy

Przemysł Chemiczny

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2022

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T. 101, nr 4

252--256

PL

Przedstawiono próbę modyfikacji materiału protetycznego Castavaria za pomocą wybranych napełniaczy krzemionkowych. Do tworzywa akrylowego wprowadzono 0,5% mas. silanizowanej krzemionki, 0,5% mas. krzemionki niesilanizowanej lub 0,5% mas. mieszaniny 1:1 krzemionki silanizowanej i niesilanizowanej. W drugim etapie wprowadzono 1, 5 lub 8% mas. krzemionki po silanizacji. Mieszaninę umieszczono w polimeryzatorze ciśnieniowym i poddano polimeryzacji przez 30 min zgodnie z zaleceniami producenta. Zbadano twardość metodą Vickersa, wytrzymałość na trójpunktowe zginanie oraz udarność materiału akrylowego przed i po modyfikacji. Dodatek krzemionki w ilości 0,5% mas. (silanizowanej lub niesilanizowanej) nie powodował znaczących zmian właściwości wytworzonych kompozytów w porównaniu z materiałem wyjściowym. Dodatek 5% mas. krzemionki powodował wzrost wytrzymałości na trójpunktowe zginanie i modułu sprężystości przy zginaniu, natomiast dodatek 8% mas. krzemionki prowadził do zwiększenia twardości materiału akrylowego.

EN

Com. acrylic prosthetic material was mixed with silanized or non-silanized silica in amts. of 0.5, 1, 5 and 8% by mass, and then polymerized. The Vickers hardness, three-point bending strength and impact strength of the acrylic material were detd. before and after modification. The addn. of silica in the amt. of 0.5% by mass. (silanized or nonsilanized) did not cause significant changes in the properties of the produced composites compared to the starting material. Addn. of 5% by mass silica increased the three-point bending strength and flexural modulus, while the addn. of 8% by mass of silica led to an increase in the hardness of acrylic material.

3

Influence of silver-containing filler on antibacterial properties of experimental resin composites against Enterococcus faecalis

Adeeb S., Adeeb S., Chladek G., Pakieła W., Mertas A.

Journal of Achievements in Materials and Manufacturing Engineering

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2021

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Vol. 109, nr 2

59--67

EN

Purpose: The aim of the presented work was to investigate the impact of the S-P introduction into resin-based composites on their effectiveness against Enterococcus faecalis (E. faecalis). Design/methodology/approach: Seven experimental composites based on typical matrix were developed. Six of them contained a filler with antimicrobial properties (silver sodium hydrogen zirconium phosphate, S-P), while the control material contained only common reinforcement fillers. The materials were characterized in terms of the dispersion of the extender in the matrix and then subjected to microbiological tests. The efficiency in the reduction of E. faecalis in the microenvironment was tested. Findings: The composites show a satisfactory distribution of fillers and a high initial reduction of bacteria colonies for the tested strain of E. faecalis. The reduction in bacteria colonies achieved for S-P concentrations from 7% to 13% was similar (median value from 99.8 to 99.9%, when for control material and compound with 1% S-P the number of colonies increased compared to positive control. Research limitations/implications: Laboratory test results may differ from in vivo test performance. In addition, there are many models for conducting laboratory antimicrobial efficacy studies, the results of which are also varied. The cytotoxic tests, long-term investigations and in vivo experiments need to be performed in future experiments. Practical implications: E. faecalis is a Gram-positive bacterium that is commonly detected in persistent endodontic infections and may enter the root canal through the coronal part. Development of composites with antimicrobial properties against this bacterium is as important as obtaining efficacy against cariogenic bacteria. Originality/value: The antimicrobial effectiveness against E. faecalis of experimental composites with submicrometer-sized particles of S-P was not investigated until now.

4

Charakterystyka kompozytowych materiałów stomatologicznych stosowanych w gabinetowych systemach CAD/CAM

Rogula Jakub, Kuźniar-Folwarczny Agnieszka, Sulewski Mikołaj, Błaszczyk Anna, Sulewska Agnieszka, Kosior Piotr, Dobrzyński Maciej

Inżynier i Fizyk Medyczny

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2020

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Vol. 9, nr 1

57--61

PL

Praca zawiera charakterystykę materiałów kompozytowych i hybrydowych stosowanych w gabinetowych systemach CAD/ CAM, jak również opis procedury zabiegowej podczas leczenia pacjenta z zastosowaniem jednego z nich. Materiały kompozytowe stosowane powszechnie do odbudowy bezpośredniej zębów posiadają wady, które zostały wyeliminowane w prefabrykowanych bloczkach zdatnych do obróbki skrawaniem. Frezowanie pracy ostatecznej podczas tej samej wizyty umożliwia uzyskanie uzupełnienia o lepszych właściwościach fizyko-chemicznych, lepszej estetyce i pozbawionego takich wad jak skurcz polimeryzacyjny, w podobnym czasie, co standardowe leczenie zachowawcze.

EN

The work contains the characteristics of composite and hybrid materials used in the office CAD/CAM systems, as well as a description of the procedure during treatment of the patient using one of them. Composite materials commonly used for direct tooth reconstruction have defects that have been eliminated in prefabricated blocks suitable for machining. Milling the final work during the same visit makes it possible to obtain a restoration with better physico-chemical properties, better aesthetics and free of defects such as polymerization shrinkage. All that is at a similar time as standard conservative treatment.

5

Comparison of 3D printing MJP and FDM technology in dentistry

Taczała J., Czepułkowska W., Konieczny B., Sokołowski J., Kozakiewicz M., Szymor P.

Archives of Materials Science and Engineering

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2020

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Vol. 101, nr 1

32--40

EN

Purpose: Many printers are tempting at low prices, but later their accuracy turns out to be insufficient. The study has included checking the accuracy of printing and reproducing details of 3D printers used in dental technology and dentistry such as MultiJet Printing (ProJet MP3000, 3D Systems) and Fused Deposition Modelling (Inspire S2000, Tiertime). Design/methodology/approach: The 3D prints were created from scans of the maxillary gypsum model with the loss of left premolar. In the test, objects were set to the X and Y-axis. In order to check the dimensional differences after printing, scans of the printed models were superimposed on scans of the plaster model in the GOM Inspect V8 SR1 (Braunschweig, Germany). The focus was on the distance of scans from each other and a deviation map was created for each object. Findings: The average absolute value of deviations for each of models were equalled: FDM- for X-axis 0.06 ± 0.04 mm, for Y-axis 0.07 ± 0.04 mm; MJP- for X-axis- 0.04 ± 0.02 mm, for Y-axis- 0.06 ± 0.02 mm. A chart of arithmetic averages calculated for each tooth for the best printouts in each series show that higher deviation values exist in case of FDM printout. The models printed in the X-axis have smaller values of deviations from those printed in the Y-axis. Practical implications: MultiJet Printing technology can be used to create more precise models than the FDM, but these printouts meet the requirements of dimensional accuracy too. Originality/value: CAD / CAM technology in the future will exist in every dental technology laboratory so it is important to be aware of the way the 3D printers works. By paying attention to the quality of detail reproduction, a Dental Technician is able to choose the best 3D printer for them.

6

Zastosowanie mikroskopu sił atomowych w badaniach materiałów stomatologicznych

Ziębowicz Bogusław, Ziębowicz Anna

LAB Laboratoria, Aparatura, Badania

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2019

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R. 24, nr 4

16--20

7

Charakterystyka ceramicznych materiałów stomatologicznych stosowanych w gabinetowych systemach CAD/CAM

Kuźniar-Folwarczny Agnieszka, Sulewski Mikołaj, Błaszczyk Anna, Sulewska Agnieszka, Kosior Piotr, Dobrzyński Maciej

Inżynier i Fizyk Medyczny

|

2019

|

Vol. 8, nr 6

479--487

PL

Gabinetowe systemy CAD/CAM pozwalają wykonywać uzupełnienia protetyczne podczas jednej wizyty. Zaspokojenie wysokich wymagań pacjentów związanych z estetyką uzupełnień protetycznych uwarunkowane jest dostępnością materiałów niezbędnych do ich wykonania. Materiały, z których wykonuje się uzupełnienia, to bloczki ceramiki skaleniowej, ceramik wzmacnianych leucytem lub dwukrzemianem litu, a także ceramiki hybrydowej. Spektrum uzupełnień możliwych do wykonania w danym systemie zależy od rozmiaru posiadanej maszyny frezującej, rozmiaru bloczka i właściwości wybranego materiału. Celem pracy było przedstawienie charakterystyki ceramik dentystycznych stosowanych w gabinetowych systemach CAD/CAM oraz zalet wynikających z wykorzystania tego systemu w codziennej praktyce. Opisano także postępowanie kliniczne zalecane podczas pracy z tą technologią z uwzględnieniem różnic w zależności od zastosowanego materiału do odbudowy. Wybór odpowiedniego materiału do danej sytuacji klinicznej jest zadaniem lekarza dentysty i wymaga uwzględnienia wielu czynników.

EN

Chairside CAD/CAM systems allow dental practitioners to provide their patients with restorations made during a single appointment. Satisfying the high requirements of patients associated with aesthetic restorations results for the availability of materials necessary for their performance. Materials for these restorations comprise blocks made of feldspar, leucite- and lithium disilicate-reinforced ceramics and also hybrid ceramics. The spectrum of restorations that can be fabricated with a chairside system depends on the size of the milling machine, the size of material block, and the properties of the selected material. The aim of this study was to present characteristics of dental ceramics used in chairside CAD/CAM systems and to show the benefits of using it in daily practise. Also, the clinical treatment recommendations were described based on the differences between the used material blocks. The choice of the best material to match the clinical situation is a dentist’task and many factors must be taken into account.

8

Starzeniowe badanie siły przyczepności pomiędzy miękkimi kauczukami silikonowymi a poli(metakrylanem metylu)

Fubao Z., Li D., Lianshui S., Yongfa Z., Hongshui Z.

Przemysł Chemiczny

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2018

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T. 97, nr 12

2110--2114

PL

Badano zmiany siły przyczepności w temperaturze pokojowej pomiędzy miękkim kauczukiem silikonowym a poli(metakrylanu metylu) (PMMA). Laminowane próbki wykonano z handlowych elastomerów silikonowych Ufi Gel P (UGP) i Silageum-Comfort (SLC), podzielono na grupy odpowiednio A1–A4 i B1–B4 i poddano starzeniu w sztucznej ślinie przez 1–360 dni. Siłę przyczepności tych próbek wyznaczono, wykorzystując uniwersalne urządzenie do testowania materiałów w sposób niszczący. Styk przyczepny obserwowano za pomocą skaningowego mikroskopu elektronowego. Badanie nie wykazało statystycznej różnicy w sile przyczepności w obrębie grup A i B (P > 0,05). Stwierdzono jednak statystyczne różnice w sile przyczepności pomiędzy grupami A i B (P < 0,05). Destrukcja polegała głównie na defekcie mieszania lub defekcie przyczepności. Styki przyczepne w próbkach wszystkich grup były jednorodne, lecz w grupie A sporadycznie obserwowano pęcherzyki. Po starzeniu w temperaturze pokojowej nie stwierdzono istotnych zmian w sile przyczepności UGP i SLC do PMMA. Siła ta osiągnęła wartość wymaganą do zastosowania klinicznego (0,44 MPa). Siła przyczepności UGP i PMMA była większa niż w przypadku SLC i PMMA.

EN

Forty-eight laminated specimens were made of 2 com. dental soft Si elastomers and in situ produced poly(Me methacrylate), aged at room temp. in artificial saliva for 1–360 days and studied for bonding strength in a destructive way by using a universal testing machine. The specimens were randomly divided into 8 groups differing in the soft lining materials and aging time. The adhesive interface was obsd. by scanning electron microscopy. The bonding strength depended only on the Si elastomer type. There was no statistical difference in bonding strength when the same Si elastomer was used. The bonding strength was higher than the required for clinical use (0.44 MPa).

9

Impact of prosthetic materials manufacturing process on the reliability of dentures

Jadczak K., Białek R., Kuchta M.

Journal of KONBiN

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2018

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No. 45

183--198

EN

The paper presents a method of testing dental alloys used to produce frame dentures. The material constants stated by the manufacturers of dental alloys were verified. The impact of presented discrepancies on the durability and reliability of a frame denture was discussed.

PL

W referacie przedstawiono metodę badania stopów dentystycznych używanych do produkcji szkieletowych protez zębowych. Dokonano weryfikacji stałych materiałowych podawanych przez producentów stopów dentystycznych. Omówiono wpływ prezentowanych rozbieżności na trwałość i niezawodność szkieletowej protezy zębowej.

10

Effects of Different Inorganic Fillers on Mechanical Properties and Degree of Conversion of Dental Resin Composites

Stencel R., Pakieła W., Barszczewska-Rybarek I., Żmudzki J., Kasperski J., Chladek G.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 3

1361--1369

EN

The aim of the study was to evaluate the influence of different fillers on the chosen functional properties of experimental composites based on typical polymeric matrix, in order to understand the effect of different fillers on their properties and to develop a simple base composite for further investigations with experimental fillers, e.g. with antimicrobial properties. Previous experiments have been usually based on commercially available composites of unknown composition or compilation of monomers, without reinforcing fillers. Scanning electron microscopy was used to investigate the quality of fillers’ dispersion, which was satisfying. Results showed significant differences between materials’ diametral tensile strength (p = 0.0019), compressive strength (p < 0.0001), Vickers microhardness (p < 0.0001), flexural modules (p = 0.0018), and the degree of conversion (p < 0.0001), but flexural strength was not significantly different (p = 0.0583). Investigations indicated that no filler type had an especially positive impact on the mechanical properties, but reinforcement effect was achieved by proper compilation of silica nanofiller and variable glass fillers. Nanofiller decreased the degree of conversion.

11

Wpływ powłoki nanokompozytowej na uwalnianie jonów fluoru z cementu szkłojonomerowego

Sokołowski K., Bociong K., Nowak J., Szczesio A., Szynkowska I. M., Bołtacz-Rzepkowska E., Sokołowski J.

Przemysł Chemiczny

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2017

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T. 96, nr 12

2535--2539

PL

Określono wpływ pokrycia warstwą nanokompozytową cementu szkłojonomerowego na ilość oraz dynamikę uwalnianych jonów fluorowych. W przypadku cementu bez powłoki całkowita ilość uwalnianych jonów do roztworu sztucznej śliny wynosiła 0,12-0,28 μg/mm², a materiał z powłoką uwalniał ich 0,001-0,007 μg/mm². Zastosowana warstwa zabezpieczała także cement szkłojonomerowy przed pęknięciami.

EN

Com. dental cement and composite coating were used to make dental fillings. Immediately after prepn. of the fillings, they were placed in an artificial saliva at 36.7°C for 10 days to det. the amt. of released F ions as the quality indicator of the filling. The use of the coating significantly reduced the amt. of released ions.

12

Badanie zmian temperatury podczas polimeryzacji światłoutwardzalnych dentystycznych materiałów kompozytowych

Świderski W., Malara P., Świderska J., Czech Z.

Przemysł Chemiczny

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2017

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T. 96, nr 5

1179--1182

PL

Przeprowadzono badania zmian temperatury podczas polimeryzacji dwóch materiałów kompozytowych o różnych matrycach (siloranowej i metakrylanowej) w zależności od rodzaju zastosowanej lampy polimeryzacyjnej, odległości od źródła światła i czasu naświetlania. Temperatura podczas naświetlania materiału Filtek Silorane o matrycy siloranowej była istotnie wyższa od temperatury materiału Filtek P60 o matrycy metakrylanowej. Zaobserwowano też istotnie większy wpływ czasu naświetlania na zmiany temperatury podczas naświetlania lampami LED (light-emitting diodes) niż lampą halogenową.

EN

Two com. resin-based composites with silorane-and methacrylate-based matrices were photocured at varying light-curing unit and composite type, curing distance and curing time to obs. the temp. changes. The silorane-based composite was cured at significantly higher temp. when compared with the methacrylate-based one. The curing time showed a stronger effect on temp. changes when the light-emitting diode was used as the light source than when halogen lamp was used.

13

Influence of polymerization conditions on selected properties and the shrinkage stress generated during solidification of a nanohybrid universal restorative material

Domarecka M., Bociong K., Krasowski M., Szczesio A., Sokołowski J.

Inżynieria Materiałowa

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2017

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Vol. 38, nr 6

290--294

EN

Curing processes of resin dental composites is connected with shrinkage stresses. It might influence the quality of dental restorations. Researchers make effort to reduce generated stresses. One of the methods is physical modification performed by changing the conditions of polymerization process. In this study the effect of the curing mode and the light intensity of selected curing lamps on the properties of Filtek Z550 was investigated. For this purpose, photoelastic studies were performed. Transparent and photoelastically sensitive plates made of epoxy resin were used in evaluation of contraction stress, that generates during photopolymerization of resin composites. The study also included microhardness and diametral tensile strength testing. The results show the relationship between cure method and reduction of generated shrinkage stresses. The concentration of stresses generated by material Filtek Z550 during photopolymerization were reduced significantly (in each case not less than 35%). The conventional cured samples had the highest value of DTS and HV1. There are no statistically significant differences between DTS and HV1 of the differently (method I–V) polymerized samples.

PL

Cel pracy stanowiła analiza wpływu warunków prowadzenia polimeryzacji na wybrane właściwości uniwersalnego materiału nanohybrydowego do wypełnień.

14

Contemporary aesthetic restorative dental composite materials

Malara P., Świderski W.

Journal of Achievements in Materials and Manufacturing Engineering

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2016

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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.

15

The properties of experimental silicones reinforced with silica fillers for dentistry

Kalamarz I., Chladek G., Pokój M., Łukowiec D., Krawczyk C., Stencel R., Jabłońska-Stencel E.

Archives of Materials Science and Engineering

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2016

|

Vol. 81, nr 1

22--29

EN

Purpose: Silicone materials crosslinked during the hydrosilylation reaction are common in dental prosthetics and dentistry. These materials are characterized by a relatively very good properties. However, one of the fundamental problems associated with the use of such polymers is a low resistance to microbial colonization. Numerus fillers with antimicrobial potential have been used experimentally for a decade. Anyway point of concern in this type of work is the use of commercially available materials as the matrix. However, the composition of the matrix for this materials is not clearly known. Therefore, the aim of this study was to obtain a two-component silicone material, crosslinking at room temperature, with properties corresponding to the needs of dental prosthetics, in particular as denture soft linings. Such material would be a starting point to obtain more sophisticated compositions, however, of known composition in full. Design/methodology/approach: As the matrix the mixtures of polymers were prepared. As the “catalyst” component a vinyl polydimethylsiloxane with platinum catalyst in xylene was prepared. As the “base” component a mixture of vinyl polydimethylsiloxane with methylhydrosiloxane - dimethylsiloxane copolymer was made. One of the two fillers differing in the functionalizing was added into prepared substrates (10 or 15% by weight) and ultrasonically homogenized. The Shore A hardness, tensile strength, bond strength to denture base material, water sorption and solubility were investigated. Measurements were made after different aging periods in distilled water at 37±1°C. Findings: The study showed an increase in mechanical properties with increasing concentrations of fillers. The type of filler significantly affects the test results. Increasing the aging time effects on increasing the hardness of materials. Water absorption and solubility were within the desired range. Research limitations/implications: Research limitations/implications The results of the presented research may be generally dependent on technology of fillers introduction into polymers matrix. Practical implications: The results show promising properties of the tested materials. It can be used as starting material for further studies on soft or super soft denture lining and other materials characterized by similar requirements. Originality/value: The method of receiving silicone - based composites with properties required for the selected prosthetic materials, especially denture soft linings was presented. Their properties were similar to commercially available products.

16

The influence of silver nanoparticles introduced into RTV-silicone matrix on the activity against Streptococcus mutans

Chladek G., Mertas A., Krawczyk C., Stencel R., Jabłońska-Stencel E.

Archives of Materials Science and Engineering

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2016

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Vol. 78, nr 2

59--65

EN

Purpose: The silicone based room temperature vulcanized (RTV) polymers are commonly used materials for medicine, especially for dentures and maxillofacial prostheses. Unfortunately, the colonization of those materials by pathogenic microorganisms is wellknown problem related with their applications. The aim of presented study was to examine antibacterial properties of RTV silicone for dentistry modified with silver nanoparticles. Design/methodology/approach: The silver nanoparticles were introduced into twocomponent system silicone based materials. The presence of silver nanoparticles was investigated with scanning electron microscope (SEM). The antibacterial activity against Streptococcus mutans was determined. The result were statistically analysed with a Statistica 12.5 software and non-parametric Kruskal-Wallis test (α = 0.05). Findings: The silver nanoparticles introduction into RTV - silicone allowed to enhance the antimicrobial resistance against standard strain of Streptococcus mutans. Research limitations/implications: In this research only Streptococcus mutans bacterium strain was used. In future activity of presented materials against other pathogenic bacteria living in oral cavity should be determined. Additionally long term investigation should be prepared. Practical implications: The colonization of dental materials with pathogenic bacteria and fungus is one of the most important and still unresolved problems related to exposition on oral environment. The low microbiological resistance of RTV-silicones and antimicrobial potential of silver were reported in numerous studies. The gram-positive Streptococcus mutans is commonly found in the human oral cavity and it is an important factor to tooth decay. Originality/value: The resistance against Streptococcus mutans of modified material was enhanced. The investigated materials could be a potential factor a potential conducive to reducing the risk of oral cavity infections.

17

Research on tribological properties of dental composite materials

Dziedzic K., Zubrzycka-Wróbel J., Józwik J., Barszcz M., Siwak P., Chałas R.

Advances in Science and Technology. Research Journal

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2016

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Vol. 10, nr 32

144--149

EN

Dental practice today used a lot of different materials. This paper evaluates tribological and mechanical properties of two dental materials CeramX and I-Light. Tribological analysisad of samples was conducted at temperature 37°C and in the environment of artificial saliva. The wear rate was evaluated with a ball-on-disc tribotester, in accordance to ASTM G-133 norm. The counterbodies were 6-mm-in-diameter Al2 O3 steel balls. The load of 2, 10 and 20 N was applied. The tests were conducted at 0.15 m/s sliding velocity over a sliding stroke of 1000 m. The changes in the value of the following parameters were measured during the trials: friction coefficient, friction force, temperature and wear depth. After completing the tribological tests the surface of samples was carried out.

18

Corrosion Damage Investigation of Silver-Soldered Stainless Steel Orthodontic Appliances Used in Vivo

Łępicka M., Grądzka-Dahlke M., Szarmach I.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 4

2569--2572

EN

Processes of destruction of products used in orthodontic treatment, e.g. fixed orthodontic appliances, microimplants or dental prostheses considerably limit its operational lifetime and comfort and safety of patients. The objective of the research was to evaluate and assess corrosion damage to silver-soldered stainless steel rapid palatal expansion Hyrax devices. Used in vivo for 2 or 6 months, respectively, RPE (rapid palatal expansion) devices were analyzed macroscopically and in a scanning electron microscope with an energy X-ray analyzer for signs of corrosion. The evaluated appliances showed discernible differences between the overall condition of the noble solders and the stainless steel elements. The Ag-rich solders were chiefly covered in corrosion pits, whereas stainless steel wires, molar bands and Hyrax screws presented corrosion-free surfaces. What is more, the EDS analysis showed differential element composition of the solders. According to the results, noble materials, such as Ag-rich solders, can corrode in a salivary environment when coupled with stainless steel. The selective leaching processes are observed.

PL

Procesy niszczenia produktów wykorzystywanych w leczeniu ortodontycznym, takich jak: stałych aparatów ortodontycznych, mikroimplantów oraz elementów protetyki stomatologicznej znacząco skracają trwałość eksploatacyjną wyrobów gotowych oraz obniżają komfort leczenia i poziom bezpieczeństwa pacjentów. Celem pracy jest ocena zniszczeń korozyjnych powstałych podczas eksploatacji wykonanych ze stali nierdzewnej stałych aparatów ortodontycznych typu Hyrax przeznaczonych do poszerzania szczęki na skutek tzw. szybkiej ekspansji podniebienia. Używane in vivo od 2 do 6 miesięcy aparaty RPE (rapid palatal expansion) przeanalizowano makroskopowo, za pomocą skaningowego mikroskopu elektronowego oraz przy użyciu rentgenowskiego spektroskopu dyspersyjnego. Analiza uzyskanych wyników wyraźnie wskazuje na różnicę w ogólnym stanie pomiędzy elementami wykonanymi ze stali nierdzewnej i lutami na bazie srebra. Połączenia lutowane we wszystkich analizowanych aparatach uległy dostrzegalnemu makroskopowo roztwarzaniu korozyjnemu, natomiast części konstrukcyjne wykonane ze stali 316L, takie jak: śruby, druty oraz pierścienie trzonowe wolne były od korozji. Co więcej, wykonana analiza składu chemicznego połączeń lutowanych wykazała nierównomierne rozłożenie pierwiastków stopowych, wskazujące na występowanie korozji selektywnej. Wyniki zrealizowanych badań wskazują, iż w połączeniu ze stalą nierdzewną w środowisku jamy ustnej możliwe jest roztwarzanie korozyjne materiałów szlachetnych, jakimi są luty srebrowe. Obserwuje się ślady zachodzących procesów selektywnego roztwarzania korozyjnego o szczególnie wysokiej intensywności na granicy stal nierdzewna – lut na bazie srebra.

19

Disturbing effect of different dental materials on the MRI results : preliminary study

Burchardt D. V., Borysewicz-Lewicka M.

Acta of Bioengineering and Biomechanics

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2013

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Vol. 15, no. 4

49--55

EN

The influence of different dental materials used for conserving reconstruction of teeth on the magnetic resonance imaging assessed on the basis of changes in NMR proton relaxation T1 of the physiological environment represented by the physiological salt solution has been studied. The dental materials studied varied in a wide range of chemical compositions: composites (Silux Plus made by 3M Dental, Tetric Cream made by Ivoclar-Vivadent), pH controlling composite (Ariston pHc made by Vivadent), hybrid glass ionomer (Vitremer made by 3M Dental), compomer (Hytac made by ESPE), amalgamate without the gamma phase (Septalloy made by Septodont), chemocured phosphate cement (Agatos made by Chema-Elektromet), phosphate cement with addition of silver (Argil made by Spora-Dental). The reference standard was a 0.9% physiological solution of NaCl. The relative deviations of the spin-lattice relaxation time vary from –18.5% to +24.0%. From the point of view of magnetic resonance imaging, the materials significantly disturbing the tomographic images are the amalgamate Septalloy-Septodont and glass ionomer Vitremer-3M Dental, while the composite Tetric Cream-Vivadent has insignificant effect.

20

Ocena wpływu środowiska wodnego na średnicowe naprężenie materiałów stomatologicznych na bazie polimerów

Pryliński M., Prylińska-Czyżewska A., Piotrowski P., Sobolewska E., Frączak B. A.

Przemysł Chemiczny

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2012

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T. 91, nr 12

2444-2446

PL

Materiały dentystyczne umieszczano w wodzie w temp. 37°C na 24 h lub na 1 miesiąc w celu zbadania zmian mechanicznych spowodowanych ściskaniem testowanych próbek. Nastąpiło powiększenie wymiaru ściskanych polimerów o 18–25% i zmniejszenie o 21–25% próbek cementów szkłojonomerowych po 1 miesiącu.

EN

Dental materials were placed in water at 37°C for 24 h and for 1 mo. to study the changes in mech. strength of the test pieces. An increase in the diam. tensile strength of the polymer-matrix composites (by 18–25%) and a decrease in the strength of glass ionomer cements (by 21–25%) were obsd. after 1 mo. of exposition.