1,721,011 research outputs found
Mini-implants and the efficiency of Herbst treatment: a preliminary study.
No full textBACKGROUND:
The purpose of this study is to present the use of a modified Herbst appliance in association with temporary anchorage devices (TADs) in order to enhance the correction of skeletal class II malocclusions.
METHODS:
Ten consecutive adolescents scheduled for Herbst treatment were assigned to two treatment groups. Five cases were treated with a modified miniscrew-supported Herbst appliance (experimental group (EG)) and five cases with a conventional cast Herbst appliance (control group (CG)). In all cases, the Herbst was kept in place for 9 months and was followed by fixed appliances until class I relationships were achieved. The initial (T1) and final (T2) lower incisor inclination on lateral headfilms were analyzed for each case, and the mean increase for the five EG patients and the five CG patients were compared.
RESULTS:
The mean increase in lower incisor inclination at the end of treatment was 1° (range 0° to 2°) for the EG and 7° (range 4° to 10°) for the CG.
CONCLUSIONS:
The rational association of TADs with the Herbst appliance can optimize treatment efficiency and skeletal response by reducing the occurrence of excessive lower incisor proclination
[Skeletal Class II treatment with the miniscrew-anchored Herbst].
No full textNo-compliance orthodontic treatment has recently become very popular. Unlike removable appliances requiring patient compliance, the Herbst appliance is a widely used fixed functional bite-jumping device generating predictable results in the treatment of skeletal class II malocclusions. The main problem associated with tooth-borne bite-jumping appliances is the generation of unavoidable dental movements, especially proclination of lower incisors, in addition to the skeletal effect. These dento-alveolar compensations can, when uncontrolled, compromise treatment results. This article describes two cases managed with a new treatment protocol based on the association of a modified Herbst appliance and temporary skeletal anchorage devices (TSADs) for efficient treatment of skeletal class II malocclusions
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
Folding propensity of anoplin: A molecular dynamics study of the native peptide and four mutated isoforms
No full textAnoplin, a cationic decapeptide amide GLLKRIKTLLNH2
derived from venom sac of the solitary wasp Anoplius
samariensis has been investigated through Molecular
Dynamics. The wild-type (WT) and four isoforms
were simulated both in water and in the membranemimicking
solvent trifluoroethanol (TFE). In water all
the investigated species, found to be in rapid equilibrium
between different conformational states, can be considered
as unfolded. On the other hand, in TFE all the systems
enhance their rigidity and, in general, show a-helix
as the main folded conformation. Interestingly, a semiquantitative
thermodynamic analysis has suggested that
the folding driving force is not always the same being in
some cases (e.g., the WT Anoplin) of entropic nature and
in other cases of energetic nature. VC 2015 Wiley Periodicals,
Inc. Biopolymers 103: 692–701, 2015
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