University Business Academy

Pančevo, Serbia

University Business Academy

Pančevo, Serbia
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Puskas L.,University of Belgrade | Malobabic S.,University of Belgrade | Lazic D.,Special Hospital for Mental Disorders | Todorovic V.,University Business Academy | And 2 more authors.
Vojnosanitetski Pregled | Year: 2014

Background/Aim. The interthalamic adhaesion (IA), gray matter connecting both thalami, is absent in about a quarter of human brains. Controversies are present about the nature and functional significance of the human IA. Methods. In six adult human brains we investigated the expression of different neuropeptides: somatosatin (SOM), neuropeptide Y (NPY), ghrelin, neurotensin (NT), adrenocorticotropic hormone (ACTH), substance P (SP) and L-enkephalin (L-Enk) in neurons and/or neuropil of the IA, using immunohisto-chemistry (streptavidin-biotin technique). Results. In neurons, as well as in fibers, we found immunoreactivity for ghrelin, SOM, L-Enk and NT. However, reactivity for NPY, SP and ACTH was present only in fibers within the IA. Fusiform neurons were immunoreactive for SOM, Ghrelin, L-Enk, and NT, neurons with oval perikaryon for SOM, and L-Enk, triangular neurons showed immunoreactivity mainly for NT and multipolar neurons for NT and L-Enk. Conclusion. These findings can contribute to the understanding of the function of interthalamic adhaesion, and to resolving the question whether it is a vestigial structure. No mather if the interthalamic adhaesion is vestigial structure or not, its presence or absence could be a marker for other, genetic or functional differences between human brains. Our findings indicate the presence of certain neuronal organization in the human interthalamic adhaesion which could have functional significance, and do not support its vestigial nature.

Trifkovic B.,University of Belgrade | Budak I.,University of Novi Sad | Todorovic A.,University of Belgrade | Hodolic J.,University of Novi Sad | And 3 more authors.
Measurement Science Review | Year: 2012

The paper presents a comparative study of the measuring values of the marginal gap related to the ceramic crowns made by dental CAD/CAM system using the replica technique and SEM. The study was conducted using three experimental groups, which consisted of ceramic crowns manufactured by the Cerec CAD/CAM system. The scanning procedure was carried out using three specialized dental 3D digitization systems from the Cerec family - two types of extraoral optical scanning systems and an intraoral optical scanner. Measurements of the marginal gap were carried out using the replica technique and SEM. The comparison of aggregate values of the marginal gap using the replica technique showed a statistically significant difference between the systems. The measured values of marginal gaps of ceramic crowns using the replica technique were significantly lower compared to those measured by SEM. The results indicate that the choice of technique for measuring the accuracy of ceramic crowns influences the final results of investigation.

Djordjevic M.,University Business Academy | Lapcevic A.,University Business Academy | Jevremovic D.,University Business Academy | Puskar T.,University of Novi Sad | Jovanic P.,Serbian Institute for Multidisciplinary Research
HealthMED | Year: 2012

Hydroxyapatite (HAp) can be used as a bone substitute or as a pulp capping material in dentistry. As a bioactive material it binds to live tissue, inducing biological response. HAp with undersized particles, as well as high crystalline content might have very low biological activity. Treating of bioactive materials by various methods changes their characteristics. Surrounding condition, such as saliva presence, could influence the bioactivity of HAp. Aim of the study was to determine the bioactivation - structural, morphological and chemical changes of HAp, induced by artificial saliva using XRD, FT-IR and SEM. Ten HAp samples (crystallographicaly pure phase), each of 0.5 g, were exposed to artificial saliva for 35 days (i.e. activated) and observed. At regular intervals of 7 days XRD, FT-IR spectra and SEM micrographs were obtained from the samples. XRD of an untreated HAp sample showed cristaline structure. After the exposition to the artificial saliva it showed the amorphisation - bioactivation. The amorphisation progressed in time. Combined XRD and FT-IR showed changes in concentration of Ca an P ions in HAp, as well as the ions interchange with the surrounding solution. SEM analysis of untreated Hap showed small crystal particles of the initial powder. After 35-day treatment the material structure was changed to a sponge-like structure, with a lot of unoccupied space. By combining the methods of XRD, FT-IR and SEM bioactivation of HAp with artificial saliva was detected and determined.

Puskar T.,University of Novi Sad | Jevremovic D.,University Business Academy | Williams R.J.,Cardiff Metropolitan University | Eggbeer D.,Cardiff Metropolitan University | And 2 more authors.
Materials | Year: 2014

Dental alloys for direct metal laser sintering (DMLS) are available on the market today, but there is little scientific evidence reported on their characteristics. One of them is the release of ions, as an indicator of the corrosion characteristics of a dental alloy. Within this research, the difference in the elution of metals from DMLS and cast (CM) samples of Co-Cr-Mo dental alloy in saliva-like medium of three different pH was examined by inductively-coupled plasma mass spectrometry (ICP-MS). The obtained results show that the metal elution in artificial saliva from the DMLS alloy was lower than the elution from the CM alloy. The release of all investigated metal ions was influenced by the acidity, both from the DMLS and CM alloy, throughout the investigated period of 30 days. The change in acidity from a pH of 6.8 to a pH of 2.3 for the cast alloy led to a higher increase of the elution of Co, Cr and Mo from CM than from the DMLS alloy. The greatest release out of Co, Cr and Mo was for Co for both tested alloys. Further, the greatest release of all ions was measured at pH 2.3. In saliva of pH 2.3 and pH 4.5, the longer the investigated period, the higher the difference between the total metal ion release from the CM and DMLS alloys. Both alloys showed a safe level of elution according to the ISO definition in all investigated acidic environments. © 2014 by the authors.

Puskar T.,University of Novi Sad | Potran M.,University of Novi Sad | Markovic D.,University of Novi Sad | Puskar S.,Institute for Pulmonary Diseases of Vojvodina | And 3 more authors.
HealthMED | Year: 2012

Introduction: Denture stomatitis is a chronic inflammatory disease of the soft oral tissues that occurs in denture wearing patients. Numerous factors have been proposed to have possible influence on the occurrence of denture stomatitis. Most relevant are: the age of denture, oral and denture hygiene, overnight wear of dentures, smoking habits, presence of Candida and other microorganisms. Goal: The aim of this study was to investigate factors that influence the occurrence of denture stomatitis in patients with complete dentures. Material and methods: The research involved 60 patients with complete dentures, residents of a nursing home facility. They were asked to answer a couple of simple questions regarding their age, the age of dentures, cleaning method, smoking habits and overnight wear of dentures. Afterwards a clinical examination of the oral cavity was made, followed by plaque assessment and statistical analysis. Results: Denture stomatitis was observed in 46,7% of complete denture wearers. The age of dentures, level of denture hygiene and overnight wear of dentures, have proven to be significant factors in the occurrence of denture stomatitis. Conclusion: Denture stomatitis was more frequently found among patients with old dentures, poor cleaning habits and among those who wore their dentures overnight.

Pantic M.,University of Kragujevac | Mitrovic S.,University of Kragujevac | Babic M.,University of Kragujevac | Jevremovic D.,University Business Academy | And 3 more authors.
Tribology in Industry | Year: 2015

The aim of this study is presenting AFM analysis of surface roughness of Lithium disilicate glass ceramic (IPS e.max CAD) under different finishing procedure (techniques): polishing, glazing and grinding. Lithium disilicate glass ceramics is all-ceramic dental system which is characterized by high aesthetic quality and it can be freely said that properties of material provide all prosthetic requirements: function, biocompatibility and aesthetic. Experimental tests of surface roughness were investigated on 4 samples with dimensions: 18 mm length, 14 mm width and 12 mm height. Contact surfaces of three samples were treated with different finishing procedure (polishing, glazing and grinding), and the contact surface of the raw material is investigated as a fourth sample. Experimental measurements were done using the Atomic Force Microscopy (AFM) of NT-MDT manufacturers, in the contact mode. All obtained results of different prepared samples are presented in the form of specific roughness parameters (Ra, Rz, Rmax, Rq) and 3D surface topography. © 2015 Published by Faculty of Engineering.

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