1,721,060 research outputs found
Russian Scientists -- 1956-66 -- Correspondence, General -- letter, 1958-08-01
No full textLetter from Hill, Berton F. to Zasukhin, D. N. dated 1958-08-01.Sabin Collection Fair Use Policy</a
Sabiston. Trattato di chirurgia
No full textStrutturato in modo da risultare ugualmente utile a specializzandi e chirurghi professionisti, il volume è un punto di riferimento indispensabile per rispondere in modo semplice e immediato ai complessi quesiti della pratica chirurgica e declinare la teoria secondo gli specifici problemi clinici. Ciò grazie anche al gran numero di illustrazioni e immagini a colori, alle fotografie intraoperatorie, ai video e a schemi e tabelle che sintetizzano i concetti chiave e agevolano la comprensione delle tecniche e delle procedure chirurgiche
Come ridurre la diffusione dell’aerosol durante l’epidemia da COVID-19: una nota tecnica
No full textThe aim is to reduce the aerosol spread during dental treatments. The system is made of an already existing structure: a dirty towel basket. The structure has to be put directly above patient's head. A transparent cellophane has to cover the structure, to provide a laboratory hood-like structure. The efficacy of the "dental-hood" was tested with a semi-quantitative colorimetric assay. A room dedicated for a dental unit was covered by absorbent paper. An air-polishing system and a staining powder served for the purpose. Standardized photographs were acquired one hour after dental treatment with and without dental-hood. The treatment without the dental-hood produced staining until two meters from the dental chair, with a contamination of the floor and the furnishings sensibly higher compared with the dental-hood. According to the critical situation we are living, the dental-hood represents a simple, inexpensive and effective way to reduce aerosol spread during dental treatments
The Impact of Degree Duration on Higher Education Participation: Evidence from a Large-Scale Natural Experiment
Full text linkThis paper investigates the effects on enrollment, retention rate and on-time graduation of a nationwide Bologna-Process reform introduced in Italy to establish BAs with a duration of three years, followed by optional second-tier degrees of two years, in place of single-tier degrees of four or five years. The analysis exploits exogenous delay of treatment conditions and the unique availability of microdata that cover the universe of the departments. We estimate that the reform boosted first-year enrollments by 14.5-17.3 percentage points, compared to a counterfactual status of no reform. This enrollment shift was due to participation gains rather than substitution effects, and it is likely to have persisted in the longer term. Moreover, no trade-off between increased participation and deteriorated retention and on-time graduation emerge
Long term survival of mature autotransplanted teeth: A retrospective single center analysis
Full text linkObjective: The replacement of an irremediably compromised tooth requires an implant rehabilitation or a traditional fixed partial denture. In well-selected cases, a further therapeutic possibility is represented by tooth autotransplantation. Although dental transplants are poorly understood and practiced, the international literature agrees that it is considered the first choice when applicable. The advantages of this technique are numerous: use of an autologous element, maintenance of tissue trophism, aesthetic and functional restoration, costs reduction. Although autotransplantation is often performed with immature teeth, even mature teeth with fully formed apex can be used as donors. The aim of the present work was to analyze consecutive cases of completely formed donor teeth autotransplantations performed from 2005 to 2011 in 21 patients for evaluating the survival and success rate. Materials and methods: The medical records of patients who underwent transplantation in a specialized center in Rimini (Italy) from 2005 to 2011 were checked. Only transplants of mature donor molars were considered. Patients were called up to evaluate the survival rate and success rate. Results: The mean age at the time of the surgery was 33,6 ± 7,4; mean follow up was 11,9 years ±1,9. Success rate at the time of latest recall visit was 80 % and survival 95 % of the analyzed cases. Conclusions: The survival and success rate are in complete agreement with the most recent literature and confirm that the technique of autotransplantation is reliable when indications and protocols are rigidly followed, also using mature teeth as donors
Effects of cyclic nucleotides and Calcium/Calmodulin on protein phosphorylation in the CNS of Hirudo medicinalis.
No full textPerdita di volume osseo nel mascellare posteriore
No full textLa riabilitazione a supporto implantare del mascellare posteriore edentulo presenta spesso problematiche relative alla limitata dimensione verticale e alla scarsa densità dell’osso crestale residuo.
Tuttavia, grazie agli sviluppi delle moderne tecniche di implantologia, è oggi possibile sia inserire impianti nel limitato volume osseo a disposizione, sia ricorrere a tecniche rigenerative che consentano di recuperare l’osso perduto.
Questo testo fornisce un’approfondita analisi del piano di trattamento e delle varie opzioni chirurgiche e protesiche disponibili: ogni capitolo contiene dettagliate informazioni, basate sulla più recente evidenza scientifica, sui passaggi diagnostici e terapeutici necessari per raggiungere e mantenere nel tempo risultati clinici ottimali.
Le opzioni minimamente invasive rappresentate dall’utilizzo di impianti corti o inclinati sono affrontate in modo approfondito, fornendo suggerimenti pratici di carattere chirurgico e protesico che possono contribuire positivamente a una prognosi favorevole.
Sono inoltre descritte step-by-step le tecniche chirurgiche di rialzo del seno mascellare con approccio laterale e transcrestale, presentando quindi un razionale biologico che sia di ausilio per il clinico nella scelta fra i diversi approcci chirurgici e fra i diversi biomateriali utilizzabili in questa procedura clinica, evidenziando vantaggi e svantaggi delle varie tipologie disponibili
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Preliminary assessment of the new routes towards a navigation grade photonic chip-scale gyroscope
No full textThe autonomous navigation of vehicles, aircraft, spacecraft, and other very complex systems critically depends on gyroscopes and their performance. Applications that require high performance, typically identified as navigation grade, are currently mainly covered by extremely accurate bulk photonic and electromechanical sensors, which, however, are partially incompatible with some emerging application domains, such as those deriving from the New Space Economy. Consequently, interest in miniaturized chip-scale gyroscopes is progressively growing, with specific attention to compatibility with harsh environments. The miniaturization of photonic gyroscopes up to their at least partial integration on chip is an interesting technological challenge in this context.The paper critically analyzes the emerging approaches potentially capable of enabling the demonstration of a navigation grade photonic chip-scale gyroscope. The results of our analysis show that the enabling technologies available today make a navigation grade photonic gyroscope technically feasible with dimensional features comparable to those of microelectromechanical gyroscopes, but at the same time, it highlights that various technological challenges must be faced to achieve experimental demonstration
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