1,720,971 research outputs found
Working length determination in primary teeth pulpectomy: A systematic review and meta-analysis
No full textThe present meta-analysis aimed to describe the methods to determine the working length in primary teeth pulpectomy, also evaluating and comparing their reliability. A systematic review was performed following the PRISMA Statement. The electronic search was conducted on PubMed, Scopus, Cochrane Library and Web of Science. After the screening protocol, a number of 14 studies were included in the qualitative analysis, while seven were included in the quantitative one. The mean working length determined by the electronic apex locator was 11.8 mm (9.0–15.55), while 12.42 mm (11.0–13.52) and 12.3 mm (9.73–15.93) were the mean working length observed with the conventional radiography and the digital radiography, respectively. No statistically significant difference was detected in quantitative analysis between the investigated methods. The present meta-analysis showed that electronic apex locator, conventional radiography and digital radiography are similar in determining working length in primary teeth
Association between blood transfusions and complications in head and neck reconstruction: a systematic review and meta-analysis
No full textPurpose: The aim of this meta-analysis is to assess the correlation between blood transfusions and the medical/surgical complications after head and neck reconstructive surgery. Methods: The PRISMA protocol was used and the literature search was performed on Pubmed, Scopus, Cochrane Library and Web of Science up to March 13, 2020. The risk of bias in individual studies was assessed through the Newcastle Ottawa Scale. Results: A total of 1219 records were screened after the electronic search, 22 of which were included in the qualitative analysis. Of there 22 scores, 18 articles were included in the meta-analysis. The OR for medical and surgical complications of transfused patients was 1,64 (95% CI 1.23–2.21); while, the OR for hospital readmission was 1.53 (95% CI 1.29–1.81). Conclusions: The results of this meta-analysis suggested that blood transfusions are associated with both an increased risk of surgical and medical complications of head and neck flaps and with the hospital readmission
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
On the numerical assessment of the thermal-hydraulic behaviour of ITER Upper Port Plug Main Body cooling circuit
No full textComportamento delle leghe metalliche prive di nichel in soggetti allergici: prove in vivo
No full textIl largo impiego di leghe metalliche ad alto contenuto di nichel nel campo ortodontico ha destato preoccupazione per l’elevata incidenza di casi di reazioni allergiche a tale metallo.L’incidenza della sensibilizzazione allergica al nichel è in costante aumento provocando una patologia cutanea ed extracutanea estremamente varia nei suoi aspetti clinici. Il ruolo del nikel nelle manifestazioni allergiche è in ascesa, si stima che siano sensibili a tale metallo dall’8 al 15% delle donne e dall’1 al 3% degli uomini che vivono in paesi Europei; ovviamente le percentuali possono variare in funzione delle fasce d’età e quindi delle abitudini. Sorgenti di questo metallo sono: monete,gioielleria,alimenti, cosmesi e apparecchi ortodontici. I soggetti N-sinsibili possono soffrire di dermatiti allergiche da contatto; o manifestare, eczema e/o orticaria. In questi pazienti, il trattamento con agenti NI-chelanti dimostra la riduzione dei sintomi allergici. E’ ovviamente probabile che vi sia una predisposizione genetica allo sviluppo di questo disturbo, ma è altrettanto chiaro che vi è un evento scatenante, cioè la sensibilizzazione.Di qui l’importanza di produrre prodotti nickel-free: per evitare crisi allergiche nelle persone già sensibili ma anche la sensibilizzazione di chi ancora non lo è.
Alla luce di questi dati è evidente come debba essere prestata estrema attenzione ai problemi dell’allergia degli apparecchi ortodontici.Questo studio si propone di valutare il comportamento di due tipi di leghe metalliche non contenenti nichel impiegate per la costruzione di fili ortodontici, in pazienti con nota ipersensibilità al metallo,paragonandolo a quello di due fili convenzionali in nichel-titanio e in acciaio inossidabile 18/8.Le prove,eseguite sia su pazienti normali che su pazienti allergici, consistono nel definire,dopo l’applicazione in bocca die fili,la risposta della gengiva,sia attraverso l’esame obbiettivo che attraverso l’analisi al microscopio elettronicoa trasmissione (TEM) e al microscopio ottico (MO)
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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