Promjene intraokularnog tlaka nakon nekomplicirane fakoemulzifikacije u ranom poslijeoperacijskom razdoblju u zdravim očima

The aim was to determine early changes in intraocular pressure (IOP) following uneventful phacoemulsifi-cation and intraocular lens (IOL) implantation in healthy eyes. This prospective interventional case series study was conducted at Ophthalmology Department, Kragujevac Clinical Centre, Kragujevac, Serbia. The study included 123 eyes of 123 cataract patients, 66 women and 57 men, age range 50-88 (mean 70.73±7.94) years having undergone phacoemulsification and in-the-bag implantation of a foldable IOL. The patients were treated at Kragujevac Clinical Centre between June 2015 and May 2016. IOP was measured by Goldmann applanation tonometry preoperatively, then 4-6 hours, 18-24 hours and 7 days postoperatively by the same examiner. The mean IOP preoperatively was 15.10±2.68 mm Hg. In three patients, maximum measured IOP was 22 mm Hg. At 4-6 hours postoperatively, the mean IOP was 24.29±7.56 mm Hg (p<0.001), at 18-24 hours it was 18.37±4.80 mm Hg (p<0.001), and 7 days after the surgery the mean IOP was 16.24±2.90 mm Hg (p<0.05). The measured IOP values were statistically signif-icant in all measured times. However, at 4-6 hours and 18-24 hours, the mean IOP value was highly statis-tically significant (p<0.001). Although 7 days after the surgery IOP normalized, the mean IOP value was statistically significant (p<0.05). In conclusion, our research showed that even eyes with normal preopera-tive values and uncomplicated phacoemulsification course can show very high IOP values postoperative-ly, which can cause pain, blurred vision and, rarely, compromise visual function.Cilj rada je bio utvrditi rane promjene intraokularnog tlaka (IOT) nakon fakoemulzifikacije i implantacije intraoku-larne leće (IOL) u zdrave oči. Ova prospektivna interventna studija slučaja provedena je na Oftalmološkom odjelu Kliničkog centra Kragujevac u Kragujevcu, Srbija. Studija je obuhvatila 123 oka bolesnika s kataraktom, 66 žena i 57 muškaraca, u dobi od 50-88 (srednja dob 70,73±7,94) godina, koji su bili podvrgnuti fakoemulzifikaciji i implan-taciji IOL u kapsularnu vrećicu. Bolesnici su liječeni u Kliničkom centru Kragujevac između lipnja 2015. i svibnja 2016. godine. IOT je mjeren Goldmannovim aplanacijskim tonometrom prijeoperacijski, a zatim 4-6 sati, 18-24 sata i 7 dana poslijeperacijski, a mjerenja je obavio isti ispitivač. Srednja vrijednost IOT prijeoperacijski je iznosila 15,10±2,68 mm Hg. Kod tri bolesnika najviši izmjereni IOT bio je 22 mm Hg. Kod mjerenja provedenog 4-6 sati poslijeoperacijski srednja vrijednost IOT bila je 24,29±7,56 mm Hg (p<0,001), zatim u 18-24 sata bila je 18,37±4,80 mm Hg (p<0,001), a 7 dana nakon operacije srednja vrijednost IOT bila je 16,24±2,90 mm Hg (p<0,05). Izmjerene vrijednosti IOTbile su statistički značajne u svim vremenima mjerenja. Međutim, u 4-6 sati i 18-24 sata srednja vrijednost IOT bila je visoko statistički značajna (p<0,001). Iako se 7 dana nakon operacije vrijednost IOT normali-zirala, srednja vrijednost je bila statistički značajna (p<0,05). U zaključku, naše istraživanje je pokazalo da čak i oči s normalnim prijeoperacijskim vrijednostima i nekompliciranim tijekom fakoemulzifikacije mogu pokazivati vrlo visoke vrijednosti IOT, što može uzrokovati bol, zamagljen vid i, rijetko, ugroziti vidnu oštrinu

Imunohistohemijska identifikacija citokeratina u submandibularnoj pljuvačnoj žlezdi pacova u toku ontogeneze

Cytokeratins (CK) are a group of proteins comprised of at least 20 different skeletal polypeptides specific for simple and complex epithelia of almost all tissues. Until recently only a few antibodies for cytoskeletal proteins were available and thus it was very difficult to visualize all the components of postnatal cytodifferentiation of salivary glands. Therefore, morphologic and immunophenotypic features of the CK polypeptides, have been analized within the rat submandibular salivary glands (SSG) during postnatal development. SSG were obtained from 1, 30 and 60 days old, male, AO rats. Streptavidin-biotin immunoperoxidase method was used for immunohistochemistry. Cryostat sections were fixed in acetone and incubated with monoclonal antibodies (mAbs) which specifically react with CK polypeptides (CK7, CK8, CK18, CK kidney, K8.12, K8.13) and rat epithelium (PT13D11). Immunohistochemical analysis of the rat SSG showed phenotypic heterogeneity of particular components of this gland during postnatal development. Regarding CK profiles it was shown that epithelial cells of the acini expressed CK18, whereas epithelial cells of the duct expressed K8.12 and K8.13 mAbs. Epithelial cells of the acini were not stained by K8.12 and PT13D11 mAbs. Intercalated ducts were strongly CK kidney+ and PT13D11+. Myoepithelial cells of the acini were stained by K8.13 mAbs, whereas these cells were not stained by mAbs specific for simple epithelia. This immunohistological study showed that the heterogeneity expression of CK polypeptides might also be useful to further understand the origin of epithelial SSG cells, as well as their development and function.Citokeratini (CK) su grupa složenih proteina koji se sastoje od najmanje 20 različitih polipeptida citoskeleta, specifični za običan i složeni epitel skoro svih tkiva. Do skoro je bilo dostupno samo nekoliko antitela specifičnih za proteine citoskeleta i zbog toga je bila otežana vizualizacija komponenti postnatalne citodiferencijacije pljuvačnih žlezda. U ovoj studiji su, pomoću panela monoklonskih antitela (mAt), analizirane morfološke i imunofenotipske osobine CK polipeptida, u submandibularnoj pljuvač noj žlezdi (SPŽ) pacova tokom ontogeneze. Submandiblarne pljuvačne žlezde uzimane su od soja AO pacova, muškog pola, starosti 1, 30 i 60 dana. U ovom radu korišćena je imunohistohemijska metoda streptavidin-biotin peroksidaznog bojenja. Tkivni preseci fiksirani su u acetonu i inkubirani sa mAt specifičnim za CK polipeptide (CK7, CK 8, CK 18, CK bubrega, K8.12, K8.13) i epitel pacova (PT13D11). U ovoj imunohistohemijskoj analizi, ekspresija anti -CK antitela na SPŽ pacova, pokazuje fenotipsku heterogenost određenih komponenti ove žlezde tokom postnatalnog perioda. Epitelne ćelije acinusa su CK18+, dok epitelne ćelije kanalića imaju izražene CK definisane sa K8.12 i K8.13 mAt. Epitelne ćelije acinusa nisu bile obojene sa K8.12 i PT13D11 mAt. Umetnuti kanali su bili izrazito CK bubrega+ i PT13D11+. Mioepitelne ćelije acinusa su bile obojene sa K8.13 i PT13D11 mAt, dok su ove ćelije imale negativnu reakciju sa mAt specifičnim za obični epitel. Ova imunohistohemijska studija pokazuje heterogenost u ekspresiji CK polipeptida i može poslužiti za razumevanje porekla, razvoja i funkcije epitelnih ćelija SPŽ pacova

Density functional theory calculation of the optical properties of graphene quantum dots

Graphene quantum dots (GQDs) are class of nanoparticles exhibiting unique and tunable electronic, optical, chemical and structural properties owing to their small size and quantum confinement and edge effects. GQDs most prominent characteristics are high photoluminescence, photostability, excellent photobleaching resistance, low citotoxicity, good biocompatibility, exceptional electrochemical activity and physicochemical stability, making them suitable for a wide range of applications, from biosensing and fluorescence bioimaging usage, photodynamic therapy, to optoelectronic, susteanable agricultural and environmental applications. Using density functional theory (DFT) we demonstrate that the optical properties of the GQDs can be sensitively tuned by its size, shape, edge configuration, attached chemical functionalities.Twenty-First Young Researchers’ Conference - Materials Science and Engineering: Program and the Book of Abstracts; November 29 – December 1, 2023, Belgrade, Serbi

Promene biohemijskog sastava salive kod dijabetičara

Introduction: Diabetic patients, beside numerous acute and chronic complications, often have oral manifestations of the disease. Aim: The aim of the study was to establish changes in saliva of diabetic patients in relation to healthy population in order to use saliva in the disease monitoring, as well as the changes depending on the type of diabetes. Materials and methods: The study comprised 52 adult patients of both sexes and at the age between 18 and 79 with Diabetes mellitus type 1 and 2 who were treated at the Institute for endocrinology, diabetes and metabolic disorders of the Clinical center of Serbia. The control group consisted of 67 volunteers from Belgrade, students at the School of Dentistry, aged between 19 and 24. The whole of unstimulated and stimulated saliva was collected and biochemical parameters (glucose, total proteins, albumin, sodium and potassium) were determined by methods commonly used for serum. Results: The results showed that salivary potassium level was increased in saliva of diabetic patients, that of sodium and total proteins was decreased, and glucose and albumin did not show changes compared to the control group. Concentrations of total proteins and potassium were higher in patients with DM type 2, and sodium was higher in DM type 1 (p = 0.05). Conclusion: Diabetic patients often have changes in biochemical composition of saliva.Uvod: Kod obolelih od Diabetes mellitus-a (DM), pored brojnih akutnih i hroničnih komplikacija, dolazi i do poremećaja oralne homeostaze. Cilj: Cilj rada bio je da se utvrde promene u biohemijskom sastavu salive dijabetesnih bolesnika u odnosu na zdravu populaciju radi eventualnog korišćenja salive u praćenju toka bolesti, odnosno da se utvrde promene u salivi u odnosu na tip dijabetesa. Materijal i metode: Istraživanje je obuhvatilo 52 odrasla pacijenta oba pola, uzrasta 18-79 godina, obolelih od DM - tip 1 i tip 2, lečenih na Institutu za endokrinologiju, dijabetes i bolesti metabolizma Kliničkog centra Srbije. Kontrolnu grupu činilo je 67 dobrovoljaca iz Beograda, studenata Stomatološkog fakulteta u Beogradu, uzrasta 19-24 godine. Sakupljana je ukupna nestimulisana i stimulisana saliva, a biohemijski parametri (glukoza, ukupni proteini, albumin, natrijum i kalijum) određeni su referentnim metodama za serum. Rezultati: Dobijeni rezultati su pokazali da je u salivi obolelih od dijabetesa koncentracija kalijuma povišena, koncentracija natrijuma i ukupnih proteina snižena, a glukoze i albumina nepromenjena u odnosu na kontrolnu grupu. Koncentracije proteina i kalijuma više su kod obolelih od DM tip 2 nego kod DM tip 1, a koncentracija natrijuma viša je kod DM tip 1 (p = 0.05). Zaključak: Biohemijski sastav salive je ukazao na promene kod dijabetesnih bolesnika

Privremeni cementi na bazi eugenola imaju antioksidativno dejstvo

Introduction Antioxidants protect against reactive oxygen species and expose beneficial anti-inflammatory activity when in contact with biological tissues. Dental materials that are used as temporary luting on fixed dental restorations are often in contact with injured gingival tissue, hence they should contain anti-inflammatory characteristics that are essential after prosthetic procedures preceding cementation of final restauration. Objective The aim of this study was to investigate the antioxidant effect through the oxidation inhibition (OI) of mixed dental cement for temporary luting or their liquid component. Methods Eight study groups were prepared each by ten samples: 1) ex tempore preparation of zinc-oxide eugenol paste (Kariofil Z Galenika, Serbia), 2) Viko Temp paste (Galenika, Serbia), 3) Temp Bond NE paste (Kerr, Germany), 4) ScutaBond (ESPE, Germany), 5) Cp-CAP paste (Germany, Lege Artis) and oil component of 6) Kariofil Z, 7) Viko Temp and 8) Cp-CAP. The samples were subjected to spectrophotometer to measure OI 2,2'-azino-di-(3-ethyl-benzthiazoline-6-sulphonic acid) (ABTS) using Randox kit, United Kingdom. The control samples were pure ascorbic acid (1% w/v). Results High values of OI exposed materials (groups 1, 5, 6, 7, 8) with content of eugenol (or its derivates) in the range of 100-88.8% were statistically more significant than the values of non-eugenol substances (groups 2, 3, 4) with the range of 8.2-43.5%. Conclusion Eugenol containing temporary fixation materials show significant antioxidative properties and therefore they may be used in those clinical situations where surrounding gingival tissue is injured during restorative procedure.Uvod Antioksidansi štite živa tkiva od reaktivnih kiseonikovih slobodnih radikala, čime ispoljavaju poželjno antiinflamatorno dejstvo u kontaktu sa živim tkivom. Stomatološki materijali koji služe za privremeno cementiranje protetičkih restauracija često su u kontaktu s lediranim tkivom gingive, pa stoga treba da poseduju poželjne antiinflamatorne osobine, vrlo bitne nakon protetičkih procedura koje prethode cementiranju fiksnih restauracija. Cilj rada Cilj ispitivanja je bio da se pomoću zabeleženih vrednosti inhibicije oksidacije (IO) utvrdi antioksidativni efekat nekoliko pripremljenih preparata za privremeno cementiranje i njihovih tečnih komponenata. Metode rada Po deset uzoraka je pripremljeno u osam eksperimentalnih grupa: 1) ex tempore zamešana cink-oksidna (ZnO) eugenol pasta (Kariofil Z Galenika, Srbija); 2) pasta Viko Temp (Galenika, Srbija); 3) pasta Temp Bond NE (Kerr, Nemačka); 4) pasta ScutaBond (ESPE, Nemačka); i 5) pasta Cp-CAP (Lege Artis, Nemačka); njihove tečne komponente: 6) ulje Kariofil Z; 7) ulje Viko Temp; i 8) ulje Cp-CAP. Uzorci su podvrgnuti spektrofotometru radi merenja vrednosti IO na ABTS primenom seta reagensa (Randox kit, Velika Britanija). Kontrolnu grupu su činili uzorci čiste askorbinske kiseline (1% w/v). Rezultati Visoke vrednosti IO ispoljili su uzorci u grupama eugenolnih materijala 1, 5, 6, 7 i 8 u rasponu od 88,8% do 100%, što je bilo statistički značajno u odnosu na niže vrednosti kod neeugenolnih materijala (raspon 8,2-43,5%) u grupama 2, 3 i 4. Zaključak Nije zabeležena statistička značajna razlika u vrednostima IO međusobnim poređenjem eugenolnih grupa (p>0,05). Poređenjem vrednosti IO između neeugenolnih grupa, samo je kod grupe 4 utvrđena statistički značajna razlika prema grupama 2 i 3 (p lt 0,01). Poređenjem uzoraka 2 i 3 zabeležena je statistički beznačajna razlika za vrednosti IO (p>0,05)

Analysis of accuracy and precision of optical 3D digitisation devices in dental computer-aided-design and computer-aided-manufacturing systems

The implementation of intraoral and extraoral computer-aided-design and computer-aided-manufacturing (CAD/CAM) systems in prosthetic dentistry has simplified the procedure, shortened the period of design and manufacture and improved accuracy and aesthetic properties of dental restorations. Three-dimensional (3D) digitisation has become an adequate replacement for conventional dental impressions. The market offers a variety of diverse optical intraoral and extraoral CAD/CAM systems equipped with digitisation devices that are based on different working principles. The main goal of this research is to determine whether precision and accuracy differ among optical digitisation devices. The research includes five high-end devices: Cerec AC, Cerec InEos, Trios, KaVo Everest and Sinergia Scan. The evaluation methodology of the experiment is based on CAD inspection. The results, obtained from accuracy and precision measurements with tolerance levels of 0.01, 0.25 and 0.05 mm, indicate that there is a difference in accuracy and precision between optical digitisation devices based on different working principles

Zajedničke imunofenotipske odlike podvilične pljuvačne žlezde i grudne žlezde pacova

Introduction. Submandibular salivary gland is a part of the neuro-immune-endocrine system. It contains biological factors which regulate a number of functions in the body including the modulation of thymus function. Objective. The aim of the study was to investigate immunophenotypic characteristics of submandibular salivary glands of rats during ontogenesis, using the panels of monoclonal antibodies and to compare with the phenotypic characteristics of epithelial components of the thymus. Methods. Submandibular salivary glands and thymus were obtained from 1, 30 and 60 days old male AO (Albino, Oxford) rats. Streptavidin-biotin peroxidase method was used for staining. Results. Immunohistochemical analysis of rat submandibular salivary glands showed phenotypic heterogeneity of particular components of this gland during the postnatal development. We demonstrated that rat submandibular salivary glands share common antigens with rat thymic epithelial cells, but the observed phenotypic similarity between the individual regions was considered much more significant. Our data showed that the phenotypic similarity between duct epithelial cells and subcapsular epithelial cells and most medullary cells, whereas cortical epithelial cells are phenotypically similar to acinar cells. Conclusion. This immunohistological study showed phenotypic complexity of the submandibular salivary gland and similarity to the thymus that opens new perspectives in studying phenotypic similarities between this gland and lymphatic organs.Uvod. Submandibularna pljuvačna žlezda je deo neuroimunoendokrinog sistema koja posredstvom bioloških faktora reguliše mnoge funkcije u organizmu, uključujući i modulaciju funkcije timusa. Cilj rada. Cilj rada bio je da se ispitaju imunofenotipske odlike submandibularne pljuvačne žlezde pacova tokom ontogeneze pomoću panela monoklonskih antitela i uporede s fenotipskim svojstvima epitelnih komponenti timusa. Metode rada. Istraživanja su rađena na pacovima soja AO (Albino Oxford), muškog pola, starosti od jednog, 30 i 60 dana. Za fenotipsku analizu korišćena je streptavidin-biotin- peroksidazna metoda bojenja. Rezultati. Ova imunohistološka studija ukazuje na heterogenost fenotipskih odlika pojedinih komponenti submandibularne pljuvačne žlezde tokom postnatalnog razvoja. Takođe je ustanovljeno da submandibularna pljuvačna žlezda i timus imaju zajedničke antigene, ali je mnogo značajnija fenotipska sličnost između pojedinih regiona u oba ispitivana organa. Epitelne ćelije izvodnih kanala submandibularne pljuvačne žlezde su fenotipski slične epitelnim ćelijama subkapsularne i većini ćelija u meduli timusa. Epitelne ćelije acinusa su fenotipski slične epitelnim ćelijama korteksa timusa. Zaključak. Fenotipska kompleksnost submandibularne pljuvačne žlezde i sličnost s timusom otvara nove mogućnosti za analizu fenotipske sličnosti između ove žlezde i limfatičnih organa

Application of Replica Technique and SEM in Accuracy Measurement of Ceramic Crowns

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