1,720,980 research outputs found
Everstick® And Ribbond® Fiber Reinforced Composites: Scanning Electron Microscope (Sem) Comparative Analysis
No full textThe aim of the study is to compare morphological features and to evaluate wetting capabilities of two fiber-reinforced composites (FRCS); group A: Stick Tech®, by Stick Tech Ltd, Turku, Finland, and group B: Ribbond®, by Ribbond Inc., Seattle, Washington, USA, used in orthodontic retention, by scanning electron microscope (SEM). 6 groups were identified in relation to the fiber used, A: Everstick®, B: Ribbond®, and to the different times of exposition to a fluid wetting resin (Heliobond®, by Schaan, Liechtenstein): A1-B1=0 seconds, A2-B2=5 seconds, A3-B3=5 minutes. Wetting was followed by 40 seconds of light curing with a conventional halogen curing light Optilux 501® d with a light intensity of 930 mW|cm2 and a wavelength range of 400-505 nm Samples were SEM analyzed both in cross section and lengthwise. SEM observation revealed a lengthwise direction of cylindrically shaped fibers immersed in a metacrylate matrix in group A1 and straight but woven fibers in group B1. In both control groups voids ranging between 0 μm and 20 μm were visible between the fibers and groups of fibers. Groups A2 and B2 showed uniform coverage with Heliobond® and microcracks were visible. In cross section views it is apparent that wetting with Heliobond for just 5 seconds was not sufficient for the adhesive to impregnate the fibers deeply. Groups A3 and B3 revealed a deeper penetration of Heliobond®; voids ranging between 5 μm and 15 μm could be observed only in the deepest portion of the fiber. The fiber’s preparation plays a decisive role: a longer fiber wetting time with fluid resin before curing, enhances the morphological features of FRC, making them more suitable for passive and active orthodontic systems, periodontology or prosthetic dentistr
WELDING IMPROVES THE SUCCESS RATE OF ONE-PIECE IMPLANTS
No full textOne-piece implants incorporate the trans-mucosal abutment as an integral part of the implant. One-piece implant are usually welded together and immediately loaded. Since few reports are available on the effect of welding on implant’ survival, a retrospective study is performed.
Nineteen patients (10 females and 9 males) with a median age of 62 years (min-max 43-80) were enrolled. The mean follow-up was 7 months. A total of 176 one-piece implants (Diamond, BIOIMPLANT, Milan, Italy) were inserted. One hundred and thirty-eight implants were welded. Disease-specific survival curves were calculated according to the product-limit method.
In our series SVR is 93.75. Kaplan-Meier algorithm demonstrated that welded implants have a statistical significant better survival than unwelded implants.
In conclusion one-piece implants are reliable devices for oral rehabilitation (since they have a SVR = 93.75) and welding procedure reduce the number of lost implant
Everstick® And Ribbond® Fiber Reinforced Composites: Scanning Electron Microscope (Sem) Comparative Analysis
No full textThe aim of the study is to compare morphological features and to evaluate wetting capabilities of two fiber-reinforced composites (FRCS); group A: Stick Tech®, by Stick Tech Ltd, Turku, Finland, and group B: Ribbond®, by Ribbond Inc., Seattle, Washington, USA, used in orthodontic retention, by scanning electron microscope (SEM). 6 groups were identified in relation to the fiber used, A: Everstick®, B: Ribbond®, and to the different times of exposition to a fluid wetting resin (Heliobond®, by Schaan, Liechtenstein): A1-B1=0 seconds, A2-B2=5 seconds, A3-B3=5 minutes. Wetting was followed by 40 seconds of light curing with a conventional halogen curing light Optilux 501® d with a light intensity of 930 mW|cm2 and a wavelength range of 400-505 nm Samples were SEM analyzed both in cross section and lengthwise. SEM observation revealed a lengthwise direction of cylindrically shaped fibers immersed in a metacrylate matrix in group A1 and straight but woven fibers in group B1. In both control groups voids ranging between 0 μm and 20 μm were visible between the fibers and groups of fibers. Groups A2 and B2 showed uniform coverage with Heliobond® and microcracks were visible. In cross section views it is apparent that wetting with Heliobond for just 5 seconds was not sufficient for the adhesive to impregnate the fibers deeply. Groups A3 and B3 revealed a deeper penetration of Heliobond®; voids ranging between 5 μm and 15 μm could be observed only in the deepest portion of the fiber. The fiber’s preparation plays a decisive role: a longer fiber wetting time with fluid resin before curing, enhances the morphological features of FRC, making them more suitable for passive and active orthodontic systems, periodontology or prosthetic dentistr
Preservazione con collagene riassorbibile del sito postestrattivo prima del posizionamento di impianti a carico immediato in zone estetiche* Presentazione di un caso e valutazione istologica a 4 mesi
No full textThe membranes of barrier made by resorbable collagen proved suitable procedures for use in guided tissue regeneration (GTR) and like correction of anatomical defects.This article calls for the use of absorbable collagen plugs for use in extraction sockets to maintain the volumes of the bone ridge and allow the placement of implants in the frontal areas with better appearance. We explain how to use this material. To this end we presente the characteristics of the material and argue indications and contraindications. We show a case of practical application of these principles and the details of this technique. The objective of this study is to present a technique, that, used in appropriate cases, is easily applicable and allows to obtain better aesthetic result in the rehabilitation of immediate loading at the stage of provisional prosthesis
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
OSTEOPLANT® MODULATES GENES EXPRESSION IN ADIPOSE DERIVED STEM CELLS DURING OSTEOBLAST DIFFERENTIATION
No full textOsteoplant® is an equine cortical and spongy bone tissue, used to fill bone defects in orthopedic, maxillofacial and dental surgery.
To study the mechanism by which Osteoplant® induce the reabsorption and the substitution of the graft with new bone, the expression of genes related to the osteoblast differentiation were analyzed using cultures of stem cells derived from adipose tissue treated with Osteoplant®.
Gene expression profile, obtained with real time Reverse Transcription-Polymerase Chain Reaction demonstrated that Osteoplant® influences the differentiation of adipose derived stem cells by the activation of bone related genes like osteopontin (SPP1) and alkaline phosphatase (ALPL
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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