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Diş destekli üç üyeli ve dört üyeli köprü restorasyonlarında, metal üzerine preslenmiş porselen (pom) ile zirkonyum destekli ve konvansiyonel metal seramik restorasyonların, venerleme öncesi ve sonrası marjinal uyum ve iç uyumlarının karşılaştırılması Varol, Seda dnş.: Prof. Dr. Yasemin Kulak Özkan DOKTORA TEZİ PROTETİK DİŞ TEDAVİSİ ANABİLİM DALI DANIŞMAN
No full textAmaç: Çalışmanın amacı; üç farklı sistem ile hazırlanmış diş destekli üç ve dört üyeli köprü restorasyonlarında, üstyapı uygulaması öncesi ve sonrası marjinal uyum ve iç uyumların karşılaştırılmasıdır. Gereç ve Yöntem: Birer adet kesilmiş küçük azı ve büyük azı dişlerini içeren, 30’ar adet üç ve dört üyeli, toplam 60 adet köprü modeli paslanmaz çelik alaşımdan hazırlandı. Örnekler; her grupta 10’ar adet üç ve dört üyeli köprü olacak şekilde rastgele 3 gruba ayrıldı ve IPS InLine PoM (Ivoclar Vivadent, Liechtenstein) (POM), IPS e-max Zir CAD/ ZirPress (Ivoclar Vivadent, Liechtenstein) (ZİR) ve konvansiyonel metal porselen (MDP) köprü restorasyonları hazırlandı. Alınan silikon replikalardan kesitler elde edilerek restorasyonların marjinal ve iç uyum değerleri ölçüldü. Bulgular ve Sonuçlar: Marjinalden alınan ölçümlerin ortalaması molar dişlerde; MDP: 78.44 ± 32.01µm; POM: 89,84 ± 29.20µm; ZİR : 85.17 ± 28.49µm, premolar dişlerde MDP: 76.08 ± 27.92 µm; POM: 89.94 ± 23.49 µm ve ZİR: 87.18 ± 28.25 µm bulundu. Sadece molar intermarjinal (mIM) bölgede 3 ve 4 üyeli protezler arasında istatistiksel olarak fark bulundu. Üstyapı uygulaması sonrasında, molar-aksiyookluzal hariç tüm ölçüm bölgelerinde aralık değerlerinde artış gözlendi. Molar-intermarjinal, premolar-marjinal ve premolar-intermarjinal bölgelerinde, 4 üyeli MDP köprülerdeki üstyapı uygulaması sonrası aralık artışı istatistiksel olarak anlamlı bulundu (p≤0.05). Çalışmamızdan elde edilen sonuçlara göre; materyallerin klinik olarak kullanımının uygun olduğunu, fakat sonuçlarımızın, IPS InLine POM ile ilgili in vitro ve in vivo çalışmalar ile desteklenmesi gerektiğini düşünmekteyiz. Anahtar Sözcükler: zirkonyum, preslenmiş porselen, marjinal, iç uyum, köprüPurpose: In vitro comparison of marginal and internal fit between 3- and 4- units press-on-metal ceramic (PoM), zirconia supported (ZIR) and conventional metal ceramic (MC) fixed partial dentures before and after veneering. Material and method: 10 pieces for each 3 and 4 unit MC, IPS InLine PoM and IPS e-max Zir CAD/ Zir Press fixed partial dentures were produced. Cross-sections from silicone replicas were examined and measured pre/ post veneering with a light microscope. Results and Conclusion: Mean values for molars were 78.44 ± 32.01µm (MC); 89,84 ± 29.20µm (PoM); and 85.17 ± 28.49µm (ZIR); 76.08 ± 27.92 µm (MC); 89.94 ± 23.49 µm (PoM) and 87.18 ± 28.25 µm (ZIR) for premolars. No difference existed between means of 3 and 4 units’ bridges except molar-intermarginal region. After veneering, increase of gap in all sites was observed except molar-axio occlusal region. Gap increase after veneering of 4-units metal ceramics at molar-intermarginal, premolar-marginal and premolar intermarginal regions was significant (p≤0.05). According to our results, we believe these materials would be suitable for daily clinical practice. The findings of this study need to be confirmed with in vitro and in vivo studies. Key words: zirconia, pressed ceramic, marginal, internal, fi
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
In Vitro Comparison of Marginal and Internal Fit of Press-on-Metal Ceramic (PoM) Restorations with Zirconium-Supported and Conventional Metal Ceramic Fixed Partial Dentures Before and After Veneering
No full textPurposeTo compare marginal and internal fit between 3- and 4-unit press-on-metal (PoM) ceramic, zirconia-supported, and conventional metal ceramic fixed partial dentures (FPDs) before and after veneering. Materials and MethodsTen pieces for each 3- and 4-unit MC, IPS InLine PoM, and IPS e.max ZirCAD/Zir Press FPDs were produced. Cross-sections from silicone replicas were examined and measured with a light microscope. Occlusal, axial, intermarginal, and marginal mean adaptation scores of cross-sectioned replicas and means of measurements obtained from 4 sites were calculated independently. ResultsMean values for molars were 78.44 32.01 m (MC), 89.84 +/- 29.20 m (PoM), and 85.17 +/- 28.49 m (Zir). Premolar values were 76.08 +/- 27.92 m (MC), 89.94 +/- 23.49 m (PoM), and 87.18 +/- 28.25 m (Zir). No difference existed between the means of 3- and 4-unit FPDs except the molar-intermarginal region. The mean value of 4-unit FPDs (93.88 +/- 25.41 m) was less than the 3-unit FPDs (103.68 +/- 24.55 m) at the molar-inter marginal region. A gap increase was observed in all sites except the molar-axio-occlusal region after veneering. According to the mean difference, gap increases at the molar-marginal, molar-intermarginal, and premolar-intermarginal regions were statistically significant. A statistical difference was found at the molar-marginal region for 4-unit MCR (p = 0.041) and 4-unit PoM FPDs (p = 0.042) before and after veneering. Gap increase after veneering of 4-unit metal ceramics at molar-intermarginal, premolar-marginal, and premolar-intermarginal regions (p = 0.020; p = 0.015; p = 0.004) was significant. ConclusionThe gap measurements of the IPS InLine PoM and IPS e.max ZirCAD/Zir Press groups were all clinically acceptable. No studies on marginal and internal fit in the IPS InLine PoM system have been published to date. This study should be supported with future studies. No significant increase was observed after press-veneering the IPS e.max ZirCAD frameworks with an IPS e.max ZirPress material; therefore, we recommend the use of this combination
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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