GEOLOŠKO-GEOFIZIČKA ISTRAŽIVANJA LEŽIŠTA BOKSITA PRIMJENA PLITKE SEIZMIČKE REFLEKSIJE

The exploration of bauxite deposits in the region of the carbonaceous Dinarides has been performed by using different geological and geophysical methods. Deposits laying shallower or deeper below the roof sediments have so far most often been discovered by expensive drilling methods in a corresponding grid. Complex geological explorations have led to a series of valuable data thus enabling the application of other much more economical methods as well. In the region of the bauxite sedimentary basin Mesihovina-Rakitno, western Herzegovina, at the site of Studena vrila - after extensive geological explorations - a conclusion was drawn that the shallow seismic reflection geophysical method as well might be successfully applied in locating new bauxite deposits. In the paper, the geological framework of the bauxite deposits occurrences, stipulating the selection of this methode, will be presented. Measurements were performed on a known deposit (L-84, Povaljenica), completely defined by exploration drilling. The obtained results justify the selection of the shallow seismic reflection method as one of the methods for exploring bauxite deposits beneath the roof beds.Istraživanje ležišta boksita, u području karbonatnih Dinarida. obavlja se uz pomoć različitih geoloških i geofizičkih metoda. Ležišta pliće ili dublje ispod krovinskih sedimenata do sada su najčešće pronalažena skupim metodama bušenja u odgovarajućoj mreži. Kompleksnim geološkim istraživanjima došlo se do niza vrijednih podataka koji omogućuju primjenu i drugih ekonomičnijih metoda. U području boksitonosnog sedimentacijskog bazena Mesihovina - Rakitno. zapadna Hercegovina, na lokalitetu Studena vrila nakon obimnih geoloških istraživanja došlo se do spoznaje da bi se pri pronalaženju novih ležišta boksita mogla s dosta uspjeha koristiti i geofizička metoda plitke seizmičke refleksije. U radu su izloženi geološki okviri pojavljivanja ležišta boksita koji su uvjetovali odabir ove metode. Mjerenja su izvedena na poznatom ležištu (L-84, Povaljenica) koje je u potpunosti definirano istražnim bušenjem. Dobiveni rezultati opravdavaju izbor plitke seizmičke refleksije kao jedne od metoda kod istraživanja ležišta boksita ispod krovinskih naslaga

Characteristics of Pediococci isolated from kachkaval cheese

Autor opisuje Pediococcus species izoliran iz kačkavalja od ovčjeg mlijeka. Izolirani koki pripadaju vrsta na Pediococcus cerevisiae ili Pediococcus acidilactici. Odnosi između ove grupe bakterija i bakterije mliječne kiseline uglavnom su indiferentni.From Kachkaval cheese of sheep milk cocci of Pediococcvs species were isolated. The isolated cocci belonged to Pediococcus cerevisiae (according to Sharpe et al., 1966) or Pediococcus acidilactici (according to Bergey, 1974). The biocenotic relationship among isolated pediococci and Lactobacilli and streptococci were mostly indifferent (in approximately 90 % of cases). The antagonistic relationship among them was only in small number (10 %) expressed

Nezaštićeni koštani autotransplantati u prednjem segmentu gornje vilice - stepen resorpcije i klinički rezultati

Background/Aim. The use of autogenous bone grafts for augmentation of the resorbed alveolar ridge is still considered the gold standard in implant dentistry. The aim of this study was to analyze the resorption rate of autogenous bone block grafts from the retromolar region placed in the frontal segment of the upper jaw unprotected by barrier membranes, to assess the stability of implants placed into the grafted bone, as well as to monitor its changes during the healing period. Methods. The study included 18 patients with a total of 20 grafted sites. The residual alveolar ridge was measured before and after the augmentation and prior to implant placement. All implants were restored with provisional crowns within 48 hours after the placement. Implant stability was assessed using resonance frequency analysis. Results. The average period from ridge augmentation to reentry was 5.4 months (range 4-6 months) . At reentry the healed alveolar ridge had a mean width of 6.1 ± 1.27 mm. The mean calculated width gain was 3.04 ± 1.22 mm. The overall surface resorption of block grafts was 0.68 ± 0.69 mm (18.85%). At the time of implant placement the mean value of implant stability quotient (ISQ) was 71.25 ± 5.77. The lowest ISQ values were noted after three weeks of healing, followed by a gradual increase until week 12. After 12 weeks implants showed significantly higher ISQ values compared to primary stability (p lt 0.05 Wilcoxon signed ranks test). During the 3-years followup period no cases of implant loss were recorded. Conclusion. Despite a significant resorption of bone grafts, it was possible to place implants in all the cases and to use the immediate loading protocol without affecting implant survival rate.Uvod/cilj. Primena autogenih koštanih graftova (implantata) za uvećavanje smanjenog (resorbovanog) alvelarnog grebena još uvek se smatra zlatnim standardom u implantologiji. Cilj ove studije bio je analiza stepena resorpcije autolognih koštanih blok transplantata nezaštićenih barijernim mebranama, uzetih iz retromolarnog predela mandibule i postavljenih u frontalni segment gornje vilice, procena stabilnosti implantata ugrađenih u povećanu regiju, kao i praćenje promene implantne stabilnosti tokom perioda oseointegracije. Metode. U studiju je bilo uključeno 18 pacijenata sa ukupno 20 autotransplantata. Širina rezidualnog alveolarnog grebena merena je pre i posle postavljanja transplantata, kao i neposredno pre ugradnje implantata. Svi implantati su opterećeni privremenim nadoknadama 48 sati nakon ugradnje. Stabilnost implantata procenjivana je primenom analize rezonantne frekvencije. Rezultati. Srednje vreme između uvećavanja grebena i ugradnje implantata iznosilo je 5,4 (4-6) meseci. Pre ugradnje implantata srednja vrednost širine grebena iznosila je 6,1 ± 1,27 mm, a povećanja širine grebena u odnosu na vrednosti pre uvećanja 3,04 ± 1,22 mm. Površinska resoprcija grafta iznosila je 18,85% (0,68 ± 0,69 mm). Srednja vrednost koeficijenta implantne stabilnosti (ISQ) u momentu ugradnje iznosila je 71,25 ± 5,77. Najniže vrednosti ISQ zabeležene su u trećoj nedelji nakon ugradnje, što je bilo praćeno postepenim porastom do dvanaeste nedelje zarastanja. Nakon dvanaest nedelja vrednosti ISQ bile su statitički značajno više od vrednosti u momentu ugradnje (p lt 0,05 Wilcoxon test). Tokom trogodišnjeg perioda praćenja nije bilo izgubljenih implantata. Zaključak. Bez obzira na značajan stepen resorpcije autotransplantata, kod svih pacijenata bilo je moguće ugraditi implantate u uvećani greben, kao i primeniti protokol ranog opterećenja bez uticaja na stepen preživljavanja implantata

Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

Objective: To analyze radiographic predictors for lower third molar eruption among subjects with different anteroposterior skeletal relations and of different age groups. Materials and Methods: In total, 300 lower third molars were recorded on diagnostic digital orthopantomograms (DPTs) and lateral cephalograms (LCs). The radiographs were grouped according to sagittal intermaxillary angle (ANB), subject age, and level of lower third molar eruption. The DPT was used to analyze retromolar space, mesiodistal crown width, space/width ratio, third and second molar angulation (alpha, gamma), third molar inclination (beta), and gonion angle. The LC was used to determine ANB, angles of maxillar and mandibular prognathism (SNA, SNB), mandibular plane angle (SN/MP), and mandibular lengths. A logistic regression model was created using the statistically significant predictors. Results: The logistic regression analysis revealed a statistically significant impact of 6 angle and distance between gonion and gnathion (Go-On) on the level of lower third molar eruption (P lt .001 and P lt .015, respectively). The retromolar space was significantly increased in the adult subgroup for all skeletal classes. The lower third molar impaction rate was significantly higher in the adult subgroup with the Class II (62.3%) compared with Class III subjects (31.7%; P lt .013). Conclusion: The most favorable values of linear and angular predictors of mandibular third molar eruption were measured in Class III subjects. For valid estimation of mandibular third molar eruption, certain linear and angular measures (beta angle, Go-On), as well as the size of the retromolar space, need to be considered

Dekompresija kao delotvorni primarni pristup radikularnoj cisti u maksilarnom sinusu

Introduction. Therapeutic approach to jaw cysts may depend on their dimensions and localization. Enucleation of cystic lesion is not always preferable in the first act, especially if large cysts are in close proximity to important anatomical structures. The aim of this paper was to present the outcome of the treatment protocol comprising preoperative decompression and subsequent enucleation of a large maxillary cyst. Case re-port. A 21-year-old male patient with large asymptomatic radicular cyst in the right maxillary sinus was presented to our clinic. Conebeam computed tomography (CBCT) showed a large cyst, which perforated the right anterior maxillary wall by 1.5 cm, and was in the intimate contact with the orbital floor. Surgical treatment of the cystic lesion comprised: preoperative decompression with biopsy in the first act and enucleation, performed under general anesthesia, 6 months after the observation period. Conclusion. Decompression with subsequent enucleation proved to be effective treatment of large radicular cyst in maxillary sinus with low-morbidity.Uvod. Terapijski pristup cistama vilice može zavisiti od njihovih dimenzija i lokalizacije. Enukleacija cistične lezije često nije pogodna u prvom aktu ako se velika cista nalazi u blizini važnih anatomskih struktura. Cilj ovog rada bio je da se prikaže ishod lečenja velike ciste u maksilarnom sinusu koji je podrazumevao preoperativnu dekompresiju i odloženu enukleaciju. Prikaz bolesnika. Prikazan je bolesnik, star 21 godinu, sa velikom, asimptomatskom, radikularnom cistom u maksilarnom sinusu. Radiografska dijagnostika pomoću cone-beam kompjuterizovane tomografije (CBCT), pokazala je prisustvo velike cistične lezije koja je probila prednji maksilarni zid (1,5 cm) i bila u bliskom kontaktu sa podom orbite. Hirurški tretman cistične lezije uključio je preoperativnu dekompresiju i biopsiju u prvom aktu i enukleaciju u opštoj anesteziji nakon 6 meseci. Zaključak. De-kompresija i odložena enukleacija pokazale su se efikasnim terapijskim pristupom kod lečenje velike radikularne ciste maksilarnog sinusa uz mali morbiditet

Histological and morphometric aspects of ridge preservation with a moldable, in situ hardening bone graft substitute

Biphasic calcium phosphates (BCP) are widely used in alveolar ridge regeneration as a porous scaffold for new bone formation. The aim of this case series was to evaluate the regenerative effect of the combination of BCP and polylactide-co-glycolide (PLGA) which can serve as a barrier membrane during bone regeneration. The study included five patients. Four months into the healing period, bone samples were collected for histological and morphometric analyses. The results of morphometric analysis showed that newly formed bone represented 32.2 ± 6.8% of the tissue, 31.9 ± 8.9% was occupied by residual graft and 35.9 ± 13.5% by soft tissue. Active osteogenesis was seen around the particles of the graft. The particles were occupied mostly by immature woven bone and connective tissue. The quality and quantity of newly formed bone, after the use of BCP/PLGA for ridge preservation, can be adequate for successful implant therapy after tooth extraction

Razvoj sposobnosti atomsko-biološko-hemijske službe u odgovoru na pretnje hemijskim oružjem

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Herpesviruses in Periapical Pathoses: An Updated Systematic Review

Apical periodontitis represents a chronic inflammation and destruction of periradicular tissue caused by polymicrobial infection of endodontic origin. The aim of this systematic review was to make an update on findings related to Epstein-Barr virus (EBV) and human cytomegalovirus (HCMV) presence in periapical pathoses and to correlate these findings with clinical, histopathological and radiographic features of periapical lesions. Methods were based on the preferred reporting items for systematic reviews and meta-analyses (PRISMA) statement. A search was performed using PubMed, Web of Science and SCOPUS. Search key words included the following medical subjects heading terms: (periapical disease OR apical periodontitis OR periapical lesions OR periapical abscess) AND (viruses OR herpesvir*). A manual search involved references from articles retrieved for possible inclusion. The search, evaluation, and critical appraisal of articles were performed by two independent judges. Collected data were analyzed using the measures of descriptive statistics. The final review has included twenty nine articles related to herpesviral presence periapical pathoses. Qualitative analysis indicated that EBV HCMV, and HHV-8 were the most prevalent species in periapical pathoses. Our findings suggest that there is wide variety of herpesviruses detection rates in periapical pathoses in relation to their clinical, histopathological and radiographic features