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Effects of hydroxyapatite and titanium-coated dental implants on bone formation and maturation in dog
No full text치의학과/석사[한글]
성견의 하악골에 수산화인산염 피개 IMZ 임플란트와 티타늄 피개 IMZ 임플란트를 이식한 다음, 16주후 조직시편을 제작하여 광학, 편광, 형광현미경을 통한 조직형태계측학적 관찰 및 석회화 관찰 그리고 EPMA를 이용한 Ca, P, Ti의 line profile 및 정량분석을 통해 수산화인산염 피개 임플란트와 티타늄 피개 임플란트 주위의 골형성 및 골성숙도를 비교하여 다음과 같은 결론을 얻었다.
1. 임플란트 주위 골조직은 치아 주위 정상 골조직에 비해서 성숙도가 떨어졌으나, 임플란트 두군간에는 유의차가 없었으며, 골개형 양상도 차이가 없었다.
2. 수산화인산염 피개 임플란트 주위골의 석회화 시기가 8-11주인 반면 티타늄 피개임플란트는 11주 전후로 늦게 이루어졌다.
3. 수산화인산염 피개 임플란트 계면에서의 골접촉율이 82.63%로 72.75%인 티타늄 피개 임플란트 보다 높았으나 통계학적으로는 유의차가 없었다.
4. 임플란트 주위 골조직이 자연치아에 비해 100μm 부위에서만 칼슘 및 인 함량이 적게 나타났으며 (칼슘 : P<0.043, 인 : P<0.0173), 다른 부위에서는 유의차가 없었다. 또한 임플란트 두군간에도 유의차가 없었다.
5. 수산화인산염 피개 임플란트에서 피개된 수산화인산염이 티타늄 임플란트체와 분리되어 그 사이로 염증세포가 침윤된 양상이 관찰되었고, 대식세포에 의한 수산화인산염의 탐식작용도 관찰되었다.
전반적으로 수산화인산염 피개 임플란트에서 티타늄 피개 임플란트 보다 골형성시기가 빨랐으나 골접촉율과 석회화 정도에서는 유의차가 없었고, 대식세포에 의한 수산화인산염의 흡수나 임플란트체와의 분리에 따른 문제점을 보여주었다.
[영문]
The purpose of this study was to compare the bone formation, maturation around HA-and titanium-coated dental implants in dog. 5 hydroxyapatite coated IMZ implants and 5 titanium coated IMZ implants were placed into the previously extracted site in the mandible of 5 adults dogs. All dogs were injected intravenously
Tetracycline, Alizalin red 5, and Calcein for bone fluorescent labelling. After the experimental period of 16weeks, The dogs were sacrificed and tissue samples around the implants were obtained. Microscopic observations(light, polariged and fhiorescence microscope), morphometric analysis, line profile with EPMA, and quantitative analysis for Ca, P, and Ti were performed.
The results were as follows;
1. Bone maturations around the implants were relatively lower than those of natural teeth. No significant differences in bone maturation arid remodeling patterns were observed between the two implant groups.
2. Calcification of bone surrounding the implants was initiated in 8-11 weeks for HA-coated implants, while it took 11 weeks or more for Ti-coated implants.
3. Bone-to-implants contact ratio of 82.63% was recorded for HA-coated group and 72.75% for titanium coated group, with no significant difference between the two groups.
4. Bone around the implants exhibited reduced quantity of Ca and P in the 100μm region relative to natural teeth, while the rest of the regions showed no statistical differences. No significant differences were found between the two implant groups.
5. There was a separation of HA layer from the implant core and subsequent infiltration of inflammatory cells into the resulting space in the HA-coated implants ,and evidences of phagocytosis of HA particles by macrophages.
Bone calcification was more rapid around HA-coated implants compared to titanium-coated implants, but HA coated implants did not show any significant differences either in the degree of calcification or the bone-to-implant contact ratio over Ti coated implants. HA-coated implants may have complications associated
with HA absorption and separation of HA layer from the implant core.restrictio
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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