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–2768. Brozoski, M. A., Traina, A. A., Deboni, M. C., et al.: Bisphosphonate-related osteonecrosis of the jaw. Rev. Bras. Reumatol., 2012, 52 (2), 265–270. Ruggiero, S. L., Dodson, T. B., Fantasia, J., et al.: American

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Authors: Ferenc Koppány, Árpád Joób-Fancsaly, Zsolt Németh, Andrea Alexandra Belik, Mihály Vaszilkó, Edvárd Márton Varmuzsa and Krisztián Benedek Csomó

-related osteonecrosis of the jaw – 2014 update. J Oral Maxillofac Surg. 2014; 72: 1938–1956. [Correction: J Oral Maxillofac Surg. 2015; 73: 1440.] [Published correction: J Oral Maxillofac Surg. 2015; 73: 1879

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The goal of the research is to examine the different reconstruction solutions, which are used for the often-occurring jaw cancer resection and finding those areas that show higher potential risks of implant fracture. Within the research some finite element analysis based on data provided by Computer tomography have been concluded. The model in practice is built up with the most frequently used reconstruction plates and monocortical screws. Both lock and non-lock system solutions were examined. The results supporting the practice showed that indeed the maximal stress would rise in the implants closer to the resection in case of screws and in case of plates this will occur in the closer areas of resection within the thinner cross-sections.

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Authors: Anatolii Romaniuk, Anna Borisivna Korobchanska, Yevhen Kuzenko and Mykola Lyndin

In the experiment on the 36 mature rats, the peculiarities of morphological disorders in the lower jaw of rats under the influence of salts of chromium, lead, zinc, iron, copper, and manganese are showed. Profound morphological changes in bone and cartilaginous tissues of lower jaw are followed by disorders of bone mineral content. The importance of the S100 protein in morphological changes in bone and cartilaginous tissues under the influence of heavy metal salts is shown.

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Abstract  

Sintered hydroxyapatite (HAp) and β-tricalcium phosphate (β-TCP) are the two most common bio-ceramics for bone substitute. Although their composition are analogous to the constituent of human hard tissue, but some disadvantages are always exist till now, such as they need a high temperature sintering process, and this would lose the functional groups for bioactivity and closed the micro- pores without any interconnections, that hamper the body fluid transportation and angiogenesis during regeneration. Furthermore, the sintered ceramics with block and fixed size is difficult to fit non-regular defect area. In this study, the mixtures of Ca(H2PO4)2H2O and CaCO3 were adjusted firstly, then distilled water were introduced in wet chemical method, and a biphasic ceramic of HAp/β-TCP will be obtained after drying and sintering, then the result product that prepared by wet chemical method will be the sample in this investigation. The physical properties of result powders were characterized by DTA/TG, XRD and SEM, respectively, the particle size of two bio-ceramics that after heat treatment were found under 5 μm in SEM examination. Powder type calcium phosphate ceramics with the Ca/P molar ratio of 1.67 can be as bone cement by mixing with polymeric binder, the fine particle product of the setting cement will possess micro-pores and macro-pores that after suitable heat treatment process, and this is good for fluid transportation and tissue regeneration.

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Abstract  

In previous works, the effects on the devitrification mechanism of a certain composition calcium phosphate with additives of TiO2, SiO2, Al2O3, CeO2 have been studied. It was found that some metal oxide additives played a key role as the nucleation agent in calcium phosphate glass-ceramics, and the devitrification mechanism of calcium phosphate glass system was changed drastically by addition such as metal oxide. Hydroxyapatite (HAp), tricalcium phosphate (TCP) and β-calcium phosphate (β-CaP2O6) whisker are the three most biologically compatible materials to human bone in bio-ceramics field. In this work, the effect on devitrification mechanism and the physical properties of certain composition calcium phosphate glass with three above additives were investigated, and the result shown that although no fine crystalline was induced in the certain composition of calcium phosphate glass when a large amount of additive was added, but such additives play a catalyst role by lowering the activation energies of devitrification. It would supplement the mechanical properties and the biocompatibility for the calcium phosphate glasses.

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Abstract  

The thermal decomposition properties of primer mixture 1 with different water content can be investigated using a series of thermal analysis equipment and by its technique. By the DSC analysis in this work, although the major exothermic peak of the primer mixture 1 with different water content, at the temperature range from 250 to 350°C were gradual disappeared when increasing the water content of primer mixture 1, but this result could not indicate that the detonating ability of wetted primer mixture 1 was lost. And by TG analysis, wetted primer mixture 1 was still found possessing detonation properties under a higher heating rate condition. Although wetted primer mixture shows hard detonating character but we still need very carefully when executing a disposal mission.

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The thermal behaviors of three pentaerythritol tetranitrate (PETN) base polymer bonded explosives (PBX), Detasheet A (EL506A, red) and Datasheet C (EL506C, yellow-green) that supply by DuPont Co., PBXN-301 were investigated using thermal techniques in this work. The thermal properties of PETN base polymer bonded explosives, such as vacuum thermal stability (VTS), time to ignition, auto-ignition and shelf life of PBX that calculation from Arrhenius equation by the length of time for 5% decomposition were also examined. By comparing the thermal properties, VTS and shelf life of PETN base polymer bonded explosives, the application and storage of Datasheet C (EL506C, yellow-green) should be considered carefully, owing to the ingredients of Datasheet C (EL506 C, yellow-green) containing nitrocellulose. Binders that using in this study seems play no significant effect on the decomposition for polymer bonded explosives, because the decomposition temperature of binders is always higher than that of PETN.

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Abstract  

The new polycyclic nitramine 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane (HNIW) has been focused as a considerable amount of research recently on investigating its polymorphs, relative stability, and respective reaction chemistry. It is known as CL-20 popularly, CL-20 is a very high-energy and relatively high oxygen balance value crystalline compound whose method of synthesis and detailed performance data are still classified. 5-oxo-3-nitro-1,2,4-triazole (NTO, or nitrotriazolone) was an insensitive molecule comparison general explosives, and the NTO based polymer bonded explosives (PBX) was a low vulnerability explosive. Both energetic materials are all very important high explosives, which is used in a variety of military formulations widely owing to the properties of high energy and desensitization of PBX, many researchers have demonstrated the usefulness of above two energetic materials in explosive component. In this work, the thermal decomposition characteristics of explosives CL-20 and NTO were studied using thermal analytical techniques (TG, DSC), then the compatibility of above two explosives with silicone rubber, and the decomposition kinetic parameters such as activation energies of decomposition, the frequency factor of the decompose reaction are also evaluated by non-isothermal DSC techniques.

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Authors: Szófia Szentpéteri, László Restár, Zsolt Németh and Mihály Vaszilkó

: 1567–1575. 4 Park W, Kim NK, Kim MY, et al. Osteonecrosis of the jaw induced by oral administration of bisphosphonates in Asian population: five cases. Osteoporos Int. 2010; 21

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