1,720,955 research outputs found
Alignmen of Teeth by Driftodontics: A Case Report
Get PDFPhysiological tooth movement or driftodontics of teeth in extraction space decrease the amount of mechanotherapy during clinical orthodontics. This is especially helpful in young patients with anterior mandibular crowding. We present a case of 13-year-old girl with severe crowding in the lower arch and moderate crowding in the upper arch. Anterior crowding in mandibular arch was relieved by driftodontics after extraction of first premolars and placement of lingual arch to prevent molar mesialization
A Comparison of Lubricated and Non-lubricated Elastomeric Separators
No full textObjective: To compare lubricated and non-lubricated elastomeric separators in terms of time taken for insertion between contact points, type of contact points encountered and force applied during insertion.
Place of Study: Institute of Dentistry, CMH Lahore Medical College, Lahore
Methodology: Forty patients willing to undergo fixed orthodontic treatment were selected for the study. Elastomeric separators divided into two groups were inserted in molar region. In group A, non-lubricated separators were passed between 106 contact point while in group B, Vaseline lubricated elastics were passed between equal number of contact points. Time taken for insertion of separators, type of force required and type of contact points encountered was noticed. Descriptive statistics were used to evaluate mean and standard deviation of time and age distribution of sample while frequency of force and contact points were also noted. One Way ANOVA was used to analyze time difference and force application across four different contact points in both Vaseline and non-Vaseline group.
Results: The mean time taken for Vaseline lubricated group was 4.76 seconds while in non-lubricated elastics, it was 7.33 seconds. Non Vaseline group encountered 13 % more tight contact points than Vaseline group. One-way ANOVA revealed that there was statistically significant difference between lubricated and non-lubricated separators in terms of time taken for insertion, force required for insertion and types of contact points encountered.
Conclusion: Vaseline lubricated separators take less time to insert and also lesser force was required to insert them. More time and force is required if the contact points are tight as compared to open contact points
A Comparison of manufacturer tolerance of different performed orthodontic arch wires
No full textObjective: To measure manufacturer tolerance of preformed rectangular orthodontic arch wires in terms of cross sectional, vertical and transverse dimensions.
Materials and Methods: One hundred and twenty preformed archwires were selected from six various brands in both stainless steel and nickel titanium. Transverse dimensions were measured at both intercanine and intermolar area by photocopying the wires and intra brand comparison was done by using portable USB microscope. Cross sectional dimensions were measured with micrometer while vertical discrepancy was measured at anterior and intermolar region with leaf gauges. One sample t test used to evaluate intra-brand tolerance in wires.
Results: Db orthodontics stainless steel wires were the most oversized while Dentaurum nickel titanium wires were the most undersized in terms of wires height. In terms of wire width, Ortho Organizers stainless steel wires were most oversized while Db orthodontics nickel titanium wires were the most under sized wires. Considering transverse dimension, intercanine width within a brand was found uniform while 3M stainless steel and Dentaurum nickel titanium wires showed statistically significant discrepancy at intermolar area in intrabrand comparison. Statistically significant vertical discrepancy at intermolar region was found in four out of six brands of stainless steel wires and only one brand of nickel titanium wires.
Conclusion: Preformed orthodontic wires can be oversized or undersized in cross sectional dimensions with vertical discrepancy mostly present in stainless steel wires. Manufacturer makes uniform intercanine width but intermolar width is usually expanded from the intended arch form
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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