1,721,431 research outputs found
A Trabecular Metal Implant 4 Months After Placement: Clinical-Histologic Case Report
No full textA Trabecular Metal Implant 4 Month After Placement Case is reported
Use of Trabecular Metal Implants for the Rehabilitation of a Maxillary Edentulous Arch: A Case Report
Full text linkIntroduction: This case report illustrates the use of trabecular metal (TM) implants to rehabilitate a severe atrophic maxillary arch that was successfully augmented by allografts.
Case Presentation: A 68-year-old female was referred to a private practice for severe maxillary alveolar bone atrophy (e.g. subsinus bone height of <1 mm on left and <4 mm on the right side). Allograft bone block augmentation was employed to regenerate ridge deficiency simultaneously with bilateral sinus augmentation. Six implants (4 TM and 2 tapered) were placed and bone specimens obtained 6 months after grafting. Radiography and histologic analysis demonstrated that implants were positioned in non-native bone. Removal torque test, performed at second stage procedure, confirmed the successful osseointegration of implants. The definitive implant-supported full-arch prosthesis was then constucted and placed in function.
Conclusion: The positive outcomes of this case report suggested that the rehabilitation of severely atrophic maxillary arch might be achieved by merging TM with new regenerative techniques without harvesting conspicuous quantities of autogenous graft
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
Analysis of Occlusal Stresses Transmitted to the Inferior Alveolar Nerve by Multiple Threaded Implants
Full text linkBackground: Potential nerve injury or loss of sensation can occur after mandibular implants placement or loading. To determine the proper distance from implants to the mandibular is critical nerve to avoid this type of damage. Hence, the purpose of this study was using biomechanical analyses to determine the safety distance from multiple implants to the inferior alveolar nerve. Material and Methods: Boundary Element Method, a numerical mandibular model, was designed to simulate a mandibular segment containing multiple threaded fixtures. This model allows us to assess the pressure, as induced by occlusal loads, on the trigeminal nerve. Such pressure distribution was evaluated against different distances from the fixtures to the mandibular canal, against the possible lack of the central fixture in a three-abutment configuration and against different levels of implant osseointegration. All the simulations considered a canal that is orthogonal to the implant axis. Results: The nerve pressure increased quickly when the implant-canal distance decreases in the range studied. The lack of the central implant to support the central abutment causes the major nerve pressures increase. Conclusions: Our study suggested a minimal implant-canal distance of 1 mm, in order to prevent inferior alveolar nerve damages caused by three connected implants. For clinical safety, we added an additional 0.5mm as a cushion so 1.5mm minimal distance should be planned to avoid any potential nerve injury
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
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