1,720,958 research outputs found
Quantitative and Qualitative in vivo Analysis of Metal Residuals in the Saliva of Subjects with and without Fixed Orthodontic Appliances
Full text linkAim of the Work: The aim of this work was to evaluate Ni e Cr ions in the saliva of
subjects with and without fixed orthodontic appliances.
Materials and Methods: This was a prospective, non-randomized study of 100
patients, so selected: 50 have undergone fixed orthodontic appliance at least from
24 months; others 50 subjects as control-group, without any fixed and/or removable
orthodontic appliance It was conducted according to the Declaration of the World
Medical Association of Helsinki. The two selected groups were compatible for age, sex,
absence of restoration in amalgam or other metals in the oral cavity. The saliva of all the
subjects was collected with standardized sterile methods. The samples were analyzed
with an atomic absorption spectrophotometer instrument.
Results: Absolute values of the salivary metal ions in the subjects with fixed
orthodontic appliances are more than the values observed in the control group, but
these values are within the normal range.
Conclusion: The results show a greater presence in saliva of Ni and Cr ions in the
group with fixed orthodontic device. This research must be deepened because ions
released in saliva can have effects both locally and in distant districts
Pallister–Killian syndrome: clinical and oral findings
No full textAbstract
Introduction: Pallister-Killian Syndrome is a sporadic and rare developmental disorder
with an incidence of 1/25000 live births which presents multisystem involvement and
caused by the presence of a supernumerary isochromosome 12p–i(12)(p10) that
determines 12p tetrasomy, with a mosaic distribution in different cell lines. Aim of this
report is to refer the craniofacial and oral characteristics of a pediatric patient.
From the analysis of the literature it can be seen that only few studies have so far
focused on the oral health status of subjects with PKS.
Case report: We report the clinical case of an 8-year-old child undergoing a dental
examination at the Pediatric Dentistry department of the University of Palermo.
The intraoral clinical examination showed poor oral hygiene with plaque index (PI)
equal to 2, carious lesions (dmft 7, DMFT 4), hypoplastic enamel of elements 2.1 and
3.1, anterior and posterior crossbite, third class molar and canine relationship and high
and narrow palate with stair-palate appearance accompanied by mucous thickening of
the upper alveolar arch. Bad habits of atypical swallowing and oral breathing are found.
Craniofacial features include sparse hair, muscular hypotonia, telecanthus, short nose
with wide root and dorsum, long labial philtrum, Pallister lip, eversion of the lower lip,
concave profile with maxillary retrusion and mandibular prominence, and low
implantation of the ears.
Conclusions: This study underlines the importance of the multidisciplinary therapeutic
approach, prevention and periodic dental checks for subjects suffering from PKS
Transverse Asymmetries of the Maxilla Even in Healthy and Apparently Symmetrical Subjects
Full text linkAbstract: In the formulation of an orthodontic treatment plan, the three-dimensional analysis of
the dental arches represents a fundamental moment for the evaluation of all the morphological
parameters necessary in order to have a correct and complete diagnosis. In this regard, the study
of the dental arches on the horizontal plane is sometimes neglected or not thorough enough. When
evaluating the transverse dimensions of the dental upper arche, the presence of an asymmetry is
frequently found, and it means that an hemiarch is larger than the other. Furthermore, any variation
in one of the three planes of space always involves an alteration also on the other two planes in
order to have compensation. The morphology of a bone segment depends on various factors, mainly
genetical, acquired and environmental. Regarding the environmental factors, the function determines
the morphology, but this in turn determines the function. In the case of unilateral mastication, the
upper maxilla will be asymmetrical, so growing patients will have compensation on other skull bones.
From these considerations arises the need for a careful study of the horizontal plane of the maxilla in
the presence of a malocclusion during diagnostic evaluations. These asymmetries, however, must be
evaluated and quantified in the diagnostic phase in order to formulate a correct plan of treatment.
The aim of this work is to demonstrate that there are almost always transverse asymmetries of the
maxilla, albeit of a slight entity, even in healthy and apparently symmetrical subjects
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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