1,720,967 research outputs found
Relationship between hard tissue surgery and the effects on the overlying soft tissues after bimaxillary orthognathic surgery of class III malocclusions
No full textAim: The purpose of this study is to assess cephalometrically the hard and soft tissue response of skeletal Class III patients treated by bimaxillary orthognathic surgery, and to evaluate the correlation between the two. Materials and Method: Twenty-one patients, 8 men and 13 women, aged 18 to 35 years, had undergone two-jaw orthognathic surgery with maxillary Le Fort I advancement osteotomy and mandibular setback osteotomy, either bilateral sagittal split or vertical ramus osteotomy; with no additional surgical procedures on the mid-face or chin.
Results and Conclusions: After the bimaxillary surgery was underlined a strong correlation in the horizontal and vertical direction between all the selected landmarks of the lower lip and chin, but only between superior labial sulcus and point A in the upper lip in the horizontal direction. The relationship between hard tissue surgery and the effect which it has on the overlying soft tissue is extremely important in predicting final facial profile and esthetical changes. Treatment planning for patient who require orthognathic surgery should include both a hard tissue and soft tissue cephalometric analysis. Although the hard tissue analysis will show the nature of the existing skeletal discrepancy, it is incomplete in providing information concerning the facial form and proportions of the patient. Patients may appear either more or less convex in their profiles than is indicated by their hard tissues because of differences in thickness of soft tissue, particularly at the junction of nose and upper lip and in the region of the chi
Role of the chin prominence on perceived attractiveness and desire for face surgery
No full textAim: The purpose of this investigation is to describe a potentially useful analysis in assessing the requiredextent of sagittal chin augmentation or set-back, by relating chin prominence to lower lip position usingthe ‘lower lip-chin prominence angle’. The secondary aim was to quantitatively evaluate the influence ofthis angle on perceived attractiveness and desire for surgery.
Materials and method: Having described this angular analysis, a quantitative evaluation was undertaken by incrementally altering the angle on an idealised profile image to create a range of images that were rated on a 7-point Likert scale by a pre-selected group of pre-treatment orthognathic patients, clinicians and laypeople. In treatment planning alterations in chin prominence, an ‘ideal’ sagittal position with soft tissue pogonion on or just behind a true vertical line through the most prominent point of the lower lip may be used.
Results and conclusions: Chin retrusion or prominence up to an angle of 15 retrusion to 5 prominence is deemed acceptable. Surgery is desired from chin prominence of greater than 15 and retrusions greater than 25. The greater the retrusion or prominence of the chin from an angle of 0, the less the perceived attractiveness and the greater the desire for surgical correction
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
Stimulated and unstimulated salivary flow rates in Juvenile Idiopathic Arthritis
No full textAim: the aim of this study is to investigate unstimulated salivary flow (USF) and stimulated salivary flow (SSF) in a sample of patients affected by Juvenile Idiopathic Arthritis (JIA).
Methods: USF and SSF were collected from 38 randomly selected JIA patients visiting Orthodontics Clinic at Ospedale Maggiore Policlinico in Milan. The spitting method was used to collect repeated saliva samples. 3 samples were collected without stimulation consecutively for 5’ and 3 more samples were collected after stimulation by citric acid. A 1’ interval was spent measuring the sample with a graduated syringe after each 5’ period. The collection was performed between 9 a.m. and 10 a.m., at least 2 hours after the last intake of food or drink. The flow rate was calculated in milliliters per minute.
Results: the sample included 30 females and 8 males. Age ranged between 6 and 28 years (mean = 13,5; median = 12). Mean flow rates resulted as follows: USF rate after 5’ = 0,395158; USF rate after 10’ = 0,365526 mL/min; USF after 15’ = 0,427895 mL/min. SSF rate after 5’ = 0,976474 mL/min; SSF rate after10’ = 0,991211 mL/min; SSF after 15’ = 1,011526mL/ min. SSF/USF ratio was maximum after 10’ (2,711735) and minimum after 15’ (2,363961). 22 patients wore orthodontic appliance and the 15 did not. No statistical difference in mean USF or mean SSF between these two groups has been appreciated.
Conclusion: data confirm that JIA patients have lower USF and SSF compared to the general population. Salivary flow rates remain stable over a period of 15’. Orthodontic appliances seem not to influence USF and SSF
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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