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Search Results: 1 - 10 of 1312 matches for " Markovi? Dejan "
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Biocompatibility assessment of glas ionomer cement: Test of cytotoxicity
MarkoviDejan
Stomatolo?ki Glasnik Srbije , 2002, DOI: 10.2298/sgs0204075m
Abstract: Evaluation o f cytotoxicity is a first step in assessment of dental materials biocompatibility. Necessity for unique criteria in researches resulted in international standard methodology (ISO). The aim of this study was to assess the cytotoxicity of four restorative materials (three glas ionomer cements and one composite material) and to define adventages and disadventages of common ISO methodology for evaluation of this aspect of dental materials biocompatibility. Research was designed according to ISO/TC 106/1995 and ISO/ 10993-5/1994 methodology. Materials used in this investigation were Fuji IILC (GC), Vitiemer (3M), Ionosit fill (DMG-Hamburg), Luxat (DMG-Hamburg). Evaluation of cytotoxicity was carried out on standardized Human Diploid Cell Lung WI-38. Obtained results showed expressive cytotoxic effect of all investigated materials without statisticaly significant difference. Estimation of material biocompatibility and assessment of obtained results can be made only after establishment of correlation with test results. Common ISO methodology is simple for conductance and reproduction, and use of cell cultures in researches is painless, cost effective and without moral or ethical dilemma.
Evaluation of diagnosis accuracy in minimal carious lesions
?ivojinovi? Vesna,MarkoviDejan
Stomatolo?ki Glasnik Srbije , 2002, DOI: 10.2298/sgs0202007z
Abstract: The aim of this study was to assess the accuracy of visual-tactile inspection (VTI) and laser fluorescence (LF) in detection of initial carious lesions on occlusal surfaces. Total of 120 premolars and molars, without any macroscopic cavitation on occlusal surface, planed to be extracted for orthodontic, prosthetic or surgical reasons, were included in this study. The agreement between histological diagnosis and diagnostic and treatment decisions of evaluated methods was assessed. The obtained results showed that specificities and sensitivities were for VTI=83 and 36%, and LF-77 and 96%. The percentage of correct treatment decisions were: VTI=54% and LF-80%. Diagnosing caries was significantly dependent on the fissure morphology and LF showed statistically better results than VTI. It can be concluded that laser fluorescence was significantly efficient and more accurate in diagnosing initial carious lesions on occlusal surfaces.
Clinical efficiency evaluation of minimal dental restorations on occlusal teeth surfaces
?ivojinovi? Vesna,MarkoviDejan
Stomatolo?ki Glasnik Srbije , 2004, DOI: 10.2298/sgs0401013z
Abstract: Minimal dental restoration of occlusal surfaces using sealing for prevention, preserve sound tooth structure. The aim of this study was to clinicaly assess the performance of three different techniques in minimal dental restoration. A total of 90 teeth (premolars or molars) with minimal carious lesions were equally divided into three groups and included in this study. In group I and II teeth were restored either with the composite resin and the resin modified glass ionomer cement. Composite sealant (separately applied) was used in both groups. In group III teeth received resin modified glass ionomer cement. These materials were used at the same time as a restorative and a sealant. Modified Cvar and Ryge criteria were used for clinical evaluation after 1, 2, 3, 6 and 12 months. Complete retention at the end of the evaluation period for I, II and III group was 97%, 93% and 93% respectively. No secondary caries was recorded after the evaluation period. From the obtained results it can be concluded that minimal dental restorations presents an efficient and successful technique in the treatment of small occlusal carious lesions.
Chemomechanical caries removal
Peri? Tamara,MarkoviDejan
Stomatolo?ki Glasnik Srbije , 2003, DOI: 10.2298/sgs0303150p
Abstract: The purpose of this paper was to introduce Carisolv system for chemo-mechanical caries removal and its main characteristics, mechanism of action, clinical procedure and the efficacy of this alternative method. New materials and technical and technological development contributed to more precise and efficient work in dentistry. However, problems of rotary instruments for caries removal have remained. Chemomechanical method for caries removal was introduced thirty years ago as an alternative to the conventional mechanical instruments. The technique involved applying a solution onto the carious tissue, allowing it to soften and to remove it without use of drill. Its advantages were: selective removal of carious tissue, absence of pain, reduced need for local anesthesia and reduced potential negative effects to the dental pulp.
Management of influence of using of fertilizers on soil quality: The case of nitrate pollutants  [PDF]
Layth Nesseef, Dragan Markovi, Dejan Markovi, Dragan Jov?i?, Zoran Jovanovi?
Open Journal of Ecology (OJE) , 2013, DOI: 10.4236/oje.2013.37057
Abstract:

Contamination of soil and water contributes to the reduction of economic income, and also has an impact on economic development and management organizations and services. In order toavoid excessive use of nitrate fertilizers we maderesearch through systematic laboratory study of applying the basic chemical and physical analyzes of selected soil samples. In this research, we apply the method that was studied movement of nitrate solution in two soil types (sand and loess), since the impact of fertilizers on the environment depends on the soil types and its category. As the result, we got accurate functional dependences of sufficiently step height of soil and the concentration of nitrate ions and those can find a specific application in agriculture for these two types of soil, and may be sufficiently adequate substitution for the field investigations. The aim of the study was to investigate the most important negative environmental and economic consequences of the using of artificial fertilizers and to show that soil tests in the laboratory can be an adequate substitute for a field test because of economic savings. The comparative analysis of experimental and numerical results for nitrates leaching in different soil types were concluded.

SOME INDICATORS OF WATER QUALITY OF THE TAMI RIVER
NADA BABOVI?,DEJAN MARKOVI,VOJKAN DIMITRIJEVI?,DRAGAN MARKOVI
Chemical Industry and Chemical Engineering Quarterly , 2011,
Abstract: This paper shows the results obtained in field analysis performed at the Tami River, starting from the settlement Ja a Tomi (the border between Serbia and Romania) to Pan evo (the confluence of Tami into the Danube). The Tami is a 359 km long river rising in the southern Carpathian Mountains. It flows through the Banat region and flows into the Danube near Pan evo. Over the years, the water quality of the river has severely deteriorated and badly affected the environment and the river ecosystem. In situ measurements enabled determination of physico-chemical parameters of water quality of the Tami River at every 400 m of the watercourse, such as: water temperature, pH value, electrical conductivity, contents of dissolved oxygen and oxygen saturation. The main reason of higher pollution of Tami is seen in connection to DTD hydro system. Sampling was performed at 7 points with regard to color, turbidity, total hardness, alkalinity, concentration of ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, iron, chlorides and sulphates in samples. The aim of the present work was to evaluate water quality in the Tami River taking into account significant pollution, which originates from settlements, industry and agriculture, and to suggest appropriate preventive measures to further decrease the pollution of the river's water.
Clinical evaluation of composite materials for pit and fissure sealing
Petrovi? Vanja,Vuli?evi? Zoran,MarkoviDejan
Stomatolo?ki Glasnik Srbije , 2003, DOI: 10.2298/sgs0302070p
Abstract: Sistemic fluoride ingestion has been found to be more effective in its caries- reducing benefits on the smooth surfaces than on the pit and fissures. A greater vulnerability to pit and fissure caries determines the need for occlusal surface specific protection. The objective of this study was to investigate clinical effectiveness of 5 different composite sealants during an 18- month observation period. Tested materials were: Superlux Seal-opak (composite with filler particles), Superlux Seal-transparent Estiseal and Fissurit (clear), and Fissurit F (composite with fluoride). They were evaluated according to modified Cvar&Ryge criteria for: retention (R), marginal adaptation (MA), marginal discoloration (MD), surface texture (ST), and secondary caries (SC). The materials were applied in 87 children 6-7 years of age, on 215 first permanent molars, two different materials for each patient. The results were tested for statistical significance by .2 and Fisher's T-test. The results showed good clinical performance of all tested materials with no statistically significant differences. High effectiveness in occlusal caries prevention rated from 97,30% for Fissurit F, and 98% for Superlux Sealopak, to 100% for all other tested sealants. Pit and fissure sealing is an effective prophylactic measure which should be part of the preventive program.
The impact of occlusal morphology on fissure sealant penetration
Petrovi? Bojan,MarkoviDejan,Blagojevi? Du?ka
Stomatolo?ki Glasnik Srbije , 2006, DOI: 10.2298/sgs0602087p
Abstract: Introduction: In contemporary preventive dentistry there are numerous experimental in vitro and clinical studies on the growing number of materials for sealing pits and fissures. Aim: the aim of this study was to evaluate the impact of occlusal tooth morphology on penetrating abilities of two types of fissure sealants and measure the unfilled space at the bottom of occlusal groove using scanning electron microscopy (SEM). Materials and methods: The sample consisted of 10 freshly extraced intact premolars and 10 molars randomly divided into 4 groups. In group I (5 premolars), and group II (5 molars) glass ionomer Fuji VII was used as fissure sealant, while in groups III (5 premolars) and IV (5 molars) resin-based sealant (Helioseal-F) was used. Six sections of each tooth were prepared for SEM. Sealant penetration was observed at 30x magnification and the unfilled space at the bottom of the groove at 500x. Sealant penetration in relation to the absolute depth of occlusal grooves was recorded and the unfilled space beneath the sealant was expressed through its greatest diameter. Results were statistically analyzed using χ2 test. Results: There was no statistically significant difference in penetration ability and the unfilled space between tested materials or teeth groups. The average depth of penetration for glass ionomer was 83% and for resin-based sealant 81% of fissure depth. Mean diameters of the unfilled space beneath the sealants were 95 μm (glass ionomer) and 93 μm (resin-based sealant). Shallower penetration of both sealing materials was observed in deep pits and fissures with greater diameter of unfilled space (p<0.05). Conclusion: Based on results of the present study it can be concluded that penetration of contemporary fissure sealants largely depends on occlusal tooth anatomy.
Clinical evaluation of pit and fissure sealant efficiency in children aged 6-7
Ivanovi? Dragan,MarkoviDejan,Stojanovi? Nikola
Stomatolo?ki Glasnik Srbije , 2007, DOI: 10.2298/sgs0701007i
Abstract: Introduction: As one of the most important dental diseases, caries cannot be treated with classic therapeutic measures, but very often, there is a need for preventive and prophylactic measures. Aim: The aim of this study was to assess clinical efficiency of composite materials and glass-ionomer cements as pit and fissure sealants in caries prevention. Materials and Methods: The study comprised 50 patients (141 teeth), both sexes, 6-7 years old with at least two erupted first permanent molars. The main diagnostic criterion was smooth enamel surface with no probe faltering on the tooth. Materials tested in this study were two composite materials (Heiloseal-Opak and Helioseal-Transparent) and two glass-ionomers (Fisurit and Fuji VII). For clinical assessment of these materials, modified Cvar-Ryge criteria were used. Results: The obtained results showed no statistically significant differences among materials in respect to retention, marginal adaptation, discoloration and secondary caries. The difference was significant in respect to surface roughness between Fuji VII and Fisurit and Fuji VII and Helioseal-Opak (p<0.05). Conclusion: Composite sealant Heiloseal-Opak and glass-ionomer Fuji VII showed better clinical results in respect to all tested parameters compared to Helioseal-Transparent and Fisurit. .
Nucleation of biomimetic hydroxyapatite
?olovi? Bo?ana,MarkoviDejan,Jokanovi? Vukoman
Stomatolo?ki Glasnik Srbije , 2011, DOI: 10.2298/sgs1101007c
Abstract: Introduction. The aim of the study was to assess the formation of biomimetic calcium hydroxyapatite (HAP) on the surface of different substrates. Material and Methods. Silica coated stainless steel tapes and thin polymer films (alginate, cellulose, poly lactide-co-glycolide - PLGA) deposited on hydroxyapatite scaffold were used as substrate. Supersaturated simulated body fluid (SBF) and SBF combined with Fetal Calf Serum (FCS) or Eagle’s Minimum Essential Medium (EMEM) were used as bioactive liquid medium where biomimetic nucleation of HAP occurred. Infrared spectroscopy with Fourier transformation was used to analyze the formed phases, while scanning electron microscopy indicated the morphology of nucleated phase. Results. The results of measuring the mass with volume adjustments done by the BET method showed that the thickness of the film of nucleated calcium hydroxyapatite depended on the time that samples spent soaked in SBF-in as well as the type of selected biomimetic medium. Conclusion. Biomimetic calcium hydroxyapatite is possible to produce by self nucleation on different substrates in the presence of simulating body fluid.
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