Wyniki wyszukiwania - Biblioteka Nauki

1

The influence of three endodontic sealers on bone healing: an experimental study

100%

Chisnoiu R. , Moldovan M. , Pastrav O. , Delean A. , Chisnoiu A. M.

Folia Morphologica

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2016

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tom 75

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nr 1

EN

Background: The aim of this experimental study is to assess the bone healing phenomenon produced in the presence of 3 dental materials used for the root canal obturation. Materials and methods: The biocompatibility of 3 endodontic sealers (a self-curing epoxy resin — AH Plus, a dual cure urethane dimethacrylate resin — RealSeal and a new dual cure endodontic hydroxyapatite based filling material) was investigated after intra-osseous implantation of the materials in rats’ calvaria. Tissue reaction was studied at 2, 4, 6, 8, 10 and 12 weeks after implantation using calibrated image retrieval by Olympus. We took into consideration the presence of inflammatory cells (polymorphonuclear leukocytes, macrophages, plasma cells, lymphocytes and giant cells) and classified the aspects of the histological samples according to the following scale: 0 — no inflammation, 1 — mild, isolated inflammation, 2 — moderate, localised inflammatory reaction, 3 — severe, diffuse and intense inflammatory reaction. Results: The inflammatory reaction was present at the 6 intervals for all the tested materials, but a decrease of the inflammatory infiltrate, statistically significant, until extinction for all tested materials was observed at the end of the experimental period. The reaction of bone tissue recovery was most intense in the case of the control area. Lower intensity osteogenesis phenomenon was observed in case of all 3 tested sealers at the end of the experimental period. Conclusions: Biocompatibility and bone healing induction of the new hydroxyapatite based endodontic filling material is comparable to other commercial materials, AH Plus and RealSeal. (Folia Morphol 2016; 75, 1: 14–20)

2

Study of the physical and mechanical properties of biomaterial composites used in mixed crowns

86%

Popovici A. , Borzea D. , Pop A. , Roman A. , Pastrav O. , Moldovan M. , Prejmerean C.

Inżynieria Biomateriałów

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2005

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tom R. 8, nr 47-53

15--16

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Measurement of radon potential from soil using a special method of sampling

72%

Cosma C. , Papp B. , Moldovan M. , Cosma V. , Cindea C. , Cindea C. , Suciu L. , Apostu A.

Acta Geophysica

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2010

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tom Vol. 58, no. 5

947-956

EN

Soil radon gas and/or its exhalation rate are used as indicators for some applications, such as uranium exploration, indoor radon concentration, seismic activity, location of subsurface faults, etc., and also in the studies where the main interest is the field verification of radon transport models. This work proposes a versatile method for the soil radon sampling using a special manner of pumping. The soil gas is passed through a columnof charcoal by using passive pumping. A plastic bottle filled with water is coupled to an activated charcoal column and the flow of water through an adjustable hole made at the bottom of bottle assures a controlled gas flow from the soil. The results obtained for the activity of activated charcoal are in the range of 20-40 kBq/m3, for a depth of approximately 0.8 m. The results obtained by this method were confirmed by simultaneous measurements using LUK 3C device for soil radon measurements. Possible applications for the estimation of radon soil potential are discussed.

4

Radon and remediation measures near Băiţa-Ştei old uranium mine (Romania)

58%

Cosma C. , Cucoş A. , Papp B. , Begy R. , Dicu T. , Moldovan M. , Truţă L. , Niţă D. , Burghele B. , Suciu L. , Sainz C.

Acta Geophysica

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2013

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tom Vol. 61, no. 4

859--875

EN

Băiţa-Ştei mine is an open pit mine in NW Romania (West Carpathian Mountains). It was the largest surface uranium deposit in the world. Two means of uranium transport and dissemination were used over time. The first was the natural way, represented by transportation of geological sediments by Crişul-Băiţa River that crosses the Băiţa surface deposit. These sediments were used as building materials (stone, gravel, sand). The second way was related to the people living in this valley, who used also the uranium waste as building material. The preliminary indoor radon concentrations measured in the buildings ranged from 40 to 4000 Bq m−3 with a mean value of 241 Bq m−3. A focused radon survey facilitated the selection of 20 houses with the highest indoor radon that were therefore proposed for remediation. To find the radon sources of these houses, systematic investigations on radon were performed. The remedial measures for these 20 houses were tested on a chosen pilot house.