Surgical treatment of odontogenic cysts of the jaws accounts for a significant percentage of dental surgery procedures. Additionally, a wide range of procedures and augmentation materials are used in ...the reconstruction of these osseous defects. The authors present a study including histology of surgical treatment of odontogenic cysts using a Biphasic Calcium Sulfate composite bone graft cement (Bond Apatite®).
The design of a Ring Imaging CHerenkov (RICH) detector for the identification of high momentum particles at the future Electron Ion Collider (EIC) is extremely challenging by using current ...technology. Compact collider setups impose to construct RICH with short radiator length, hence limiting the number of generated photons. The number of detected photons can be increased by selecting the far UV region. As standard fused-silica windows is opaque below 165 nm, a windowless RICH can be a possible approach. CsI is widely used photocathode (PC) for photon detection in the far UV range. Due to its hygroscopic nature it is very delicate to handle. In addition, its Quantum Effciency (QE) degrades in high intensity ion fluxes. These are the key reasons to quest for novel PC with sensitivity in the far UV region. Recent development of layers of hydrogenated nanodiamond powders as an alternative PC material and their performance, when coupled to the THick Gaseous Electron Multipliers (THGEM)-based detectors, are the objects of an ongoing R&D. We report here some preliminary results on the initial phase of these studies.
Dental implants have become an option for replacement of lost canine teeth in cats. Although cats appear to manage well after a canine extraction, complications such as lip entrapment can occur after ...maxillary canine tooth extraction. Even cats with a complicated crown fracture of the maxillary canine tooth that have had root canal therapy can develop lip entrapment. This can lead to painful lip ulcers and potential need for further dental treatment. Canine tooth replacement with a dental implant and prosthodontic crown is, in the authors’ experience, a predictable option that can be offered to clients who would like to replace a lost canine tooth. This report will discuss 2 long-term cases of maxillary canines replaced by dental implants/crowns.
Allergies aux fruits Lefevre, S.; Gregori, M.; Astier, C. ...
Revue française d'allergologie (2009),
December 2020, Letnik:
60, Številka:
8
Journal Article
Recenzirano
Odprti dostop
Les allergies aux fruits sont fréquentes, représentant pour les fruits de Rosacées 14 % des allergies rapportées et 5 % pour les fruits croisant avec le latex. Elles peuvent être liées à une ...sensibilisation primaire aux pollens ou isolées. Le concept d’allergie aux fruits est complexe pour le praticien en raison des difficultés de définition du fruit variable selon les classifications, l’évaluation du risque d’allergie croisée et les particularités des expressions cliniques de l’allergie alimentaire en fonction des allergènes impliqués. Cette mise au point précise les définitions botanique, culinaire et allergologique du fruit, les principales familles d’allergènes responsables d’allergies alimentaires, les particularités cliniques, diagnostiques et thérapeutiques de l’allergie aux fruits. La sensibilisation peut survenir par sensibilisation respiratoire (réactivité croisée pollens-fruits) ou par sensibilisation primaire aux fruits par voie digestive ou par contact. Les épitopes végétaux peuvent être continus ou discontinus. Le comportement thermique des allergènes, leur résistance à la digestion, leur stabilité en milieu acide permettent de caractériser leur risque. L’allergénicité varie souvent avec le cultivar, le mode de conservation, les technologies agro-alimentaires utilisées (cuisson, appertisation, fermentation, texturisation, hydrolyse, filtration…). Le diagnostic s’établit sur la base d’un algorithme basé sur l’anamnèse, les prick tests aux aliments natifs, la recherche d’IgE spécifiques, le test de réintroduction. Il convient de souligner l’importance d’utiliser les aliments natifs pour la réalisation des tests cutanés en raison de la sensibilité particulière des allergènes végétaux à la dénaturation. Le traitement se base sur l’éviction des fruits incriminés. Des essais d’immunothérapie aux allergènes de fruits sont à l’étude. Les protocoles de tolérance utilisant des fruits à différents temps de cuisson sont prometteurs pour les allergènes thermolabiles.
Fruit allergies are frequent, representing for Rosaceae fruits 14 % of reported allergies and 5 % for fruits crossing with latex. They can be linked to a primary sensitization to pollens or isolated. The concept of fruit allergy is complex for the practitioner because of the difficulties in defining the fruit, variable according to classifications, the evaluation of the risk of cross-allergy and the particularities of the clinical expressions of a food allergy according to the allergens involved. This review specifies the botanical, culinary and allergological definitions of fruit, the main families of allergens responsible for food allergies, and the clinical, diagnostic and therapeutic particularities of fruit allergy. Sensitization can occur by respiratory sensitization (pollen-fruit cross-reactivity) or by primary sensitization to fruit by the digestive tract or by contact. Plant epitopes may be continuous or discontinuous. The thermal behaviour of allergens, their resistance to digestion and their stability in an acidic environment makes it possible to characterise their risk. Allergenicity often varies with the cultivar, the method of preservation, the food processing technologies used (cooking, canning, fermentation, texturisation, hydrolysis, filtration, etc.). The diagnosis is established on the basis of an algorithm based on anamnesis, prick-tests with native foods, the search for the specific IgE, the reintroduction test. The importance of using native foods for skin testing should be stressed because of the particular sensitivity of plant allergens to denaturation. The treatment is based on the removal of the offending fruit. Immunotherapy trials with fruit allergens are under study. Tolerance protocols using fruits at different cooking times are promising for thermolabile allergens.
We report about the development status of large area gaseous single photon detectors based on a novel hybrid concept for RICH applications.
The hybrid concept combines Thick Gaseous Electron ...Multipliers (THGEMs) coupled to CsI, working as a photon sensitive pre-amplification stage, and Micromegas, as a multiplication stage. The most recent achievements within the research and development programme consist in the assembly and study of 300×300mm2 hybrid photon detectors, the optimization of front-end electronics, and engineering towards large area detectors. Hybrid detectors with an active area of 300×300mm2 have been successfully operated in laboratory conditions and at a CERN PS T10 test beam, achieving effective gains in the order of 105 and good time resolution (σ=7ns); APV25 front-end chips have been coupled to the detector resulting in noise levels lower than 1000 electrons; the production and characterization of 300×600mm2 THGEMs is ongoing.
A set of hybrid detectors with 600×600mm2 active area is envisaged to upgrade COMPASS RICH-1 at CERN in 2016.
•The hybrid detector is a novel concept for large area gaseous photon detectors.•The hybrid concept combines Thick Gaseous Electron Multipliers and Micromegas.•The COMPASS RICH-1 upgrade will adopt hybrid detectors to replace the existing MWPCs
We are developing large size THick GEM (THGEM)-based detectors of single photons, mainly meant for Cherenkov imaging applications. The R&D programme includes the complete characterisation of the ...THGEM electron multipliers, the study of the aspects related to the detection of single photons and the engineering towards large size detector prototypes. Our most recent achievements include dedicated studies concerning the ion backflow to the photocathode; relevant progress in the engineering aspects, in particularly related to the production of large-size THGEMs, where the strict correlation between the local gain-value and the local thickness-value has been demonstrated and a 300300 mm super(2) active area detector has been successfully operated at the CERN PS T10 test beam; the introduction of a new hybrid detector architecture, offering promising performance, which is formed by a THGEM layer which acts both as photocathode and pre-amplification device, followed by a MICROMEGAS (MM) multiplication stage. We report about the general status of the R&D programme and, in detail, about the recent progress.
THGEM-based photon detectors for the upgrade of COMPASS RICH-1 Alexeev, M.; Birsa, R.; Bradamante, F. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Letnik:
732
Journal Article
Recenzirano
Odprti dostop
New Cherenkov photon detectors are being developed for the upgrade of COMPASS RICH-1. The detectors are based on THGEMs, arranged in a three layer architecture, with a CsI film on the first layer ...acting as a reflective photocathode. The response of THGEMs with various geometries under different conditions has been studied and photon detector prototypes have been built, tested in laboratory and operated during test beam runs providing a typical gain of 105 and a time resolution of better than 10ns. A photon detector prototype with 300×300mm2 active area, operated at the CERN PS T10 test beam in November 2012, has confirmed the validity of this novel technology and has allowed further studies of the detector response.
•The COMPASS THGEM R&D team has performed systematic studies and parameter optimization for THGEMs to be used in RICH applications.•A triple-THGEM photon detector with 300×300mm2 active area has been successfully tested at the CERN PS T10 test-beam.•A photon detector prototype based on coupling THGEM and Micromegas has provided encouraging results in laboratory tests.•For the upgrade of COMPASS RICH-1 a set of THGEM-based photon detectors will be produced.
As placement of implants into immediate sites involves management of the remaining root structure, these residual roots may be used as a guide for the development of osteotomy. This aids in implant ...positioning and prevents drill slippage into the residual root spaces during osteotomy drilling. Following completion of the osteotomy, the remaining root structure is extracted prior to implant placement into the site. The aim of this study is to assess the success rate of implants when the residual roots were used as anatomical guides for osteotomy. One hundred implants were placed in 57 patients, and 4 different types of implants were used: 47 Bioner TOP DM implants, 20 Nobel Biocare Replace implants, 25 Biohorizons Tapered Internal implants (Birmingham, Ala), and 8 Alpha-Bio Tec SPI Implants. The implants were placed into 57 patients. Osteotomies were placed through intact residual roots, which acted as anatomical guides for implant surgical placement. Patients had a follow-up period of 2 years, and in that time none reported discomfort after implant placement. There were no signs of peri-implantitis observed in any of the patients. Of all the implants placed, the Bioner TOP DM implant showed the least amount of crestal bone loss. Placing implants through residual roots as an anatomical guide is a useful technique that shows good results over a 2-year follow-up period.
•Dechlorination of CF3OCFClCF2Cl to produce unsaturated CF3OCF=CF2 was studied.•Hydrodechlorination over metal-supported catalysts led to a new sustainable process.•A wider diversity in reaction ...products was obtained with Ru, Ni and Pd catalysts.•Pd/Ru and Pd/Cu carbon-supported catalysts resulted very active and selective.
In this work the hydrogen-assisted dechlorination of CF3OCFClCF2Cl to produce unsaturated CF3OCF=CF2 was studied over a series of metal catalysts supported on activated carbon. The results obtained indicated that the activity, stability, and selectivity of the materials were strongly dependent on the metal used. The activity of the monometallic catalysts follows the order Pd/C>Ru/C> Ni/C, while the sequence Ru/C>Ni/C>Pd/C was found for the selectivity to the target product. A wide diversity in reaction products was obtained with these materials. Pd-supported samples mainly yield saturated products. In contrast, CF3OCF=CF2 was the product most formed with Ru/C catalysts which, nevertheless, showed the lowest stability. However, when Ru or Cu was added to Pd catalysts, some very active, stable, and selective materials were obtained. Spent samples were characterized by TPD/MS, TGA, XRD, and FESEM techniques. The results obtained revealed that Ru-based catalyst deactivation was mainly due to the formation of heavy halogenated carbonaceous deposits.
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