1,720,982 research outputs found
Spiral implants bearing full-arch rehabilitation: analysis of clinical outcome
No full textAbstract Background: A spiral implant is a conical internal helix implant with a variable thread design which confers the characteristic of self drilling, self tapping and self bone condensing. Reports have reported the effectiveness of this type of implants in several clinical situations. However, because there are no reports that specifically focus on one of the biggest challenges in oral rehabilitation, i.e. the full arch rehabitation, it was decided to perform a retrospective study.Materials and Methods: The study population was composed of 23 patients (12 females and 11 males, median age 57 years) for evaluation and implant treatment between January 2005 and June 2009. 206 Spiral family implants (SFIs) were inserted with a mean post loading follow-up of 23 months. Several variables were investigated: demographic (age and gender), anatomic (maxilla and mandible, tooth site), implant (type, length and diameter), surgical (surgeon, post-extractive, flapless technique, grafts) and prosthetic (implant/crown ratio, dentition in the antagonist arch, type of loading and CT planning) variables. Implant loss and peri-implant bone resorption were evaluated. Univariate and multivariate test were performed.Results: Survival and success rates were 97.1 and 82.5\%, respectively. Only implant length and implant/crown ratio were statistical significance in determining a better clinical outcome.Conclusion: In conclusion, SFIs are a reliable tool for most difficult cases of oral rehabilitation. No differences were detected among implant type. Length and implant/crown ratio can influence the crestal bone resorption with better result for longer fixtures and an higher implant/crown ratio. In addition banked bone derived from living donors can be used to restore alveolar ridge augmentation without adverse effects. Finally, flapless and CT-planned surgery did not significant increases the clinical outcome in most complex rehabilitation
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
One-step oral rehabilitation by means of implants' insertion, Le Fort I, grafts, and immediate loading
No full textPurpose: Inthelastdecade,severalinvestigatorshavereportedthat autologous and homologous fresh frozen bones are effective ma- terials to restore alveolar ridges before insertion of dental implants. Recently, we have used femur homograft derived from living donors. Here, we reported a 1-step oral rehabilitation of the severely re- sorbed maxilla by means of implants’ insertion, Le Fort I osteotomy for maxillary advancement, grafts, and immediate loading. Methods: Patients were treated with 1-step oral rehabilitation. Age, sex, implant length and diameter, tooth site, loading, and grafts were the investigated variables. Implant failure and peri-implant bone re- sorption were considered as predictors of clinical outcome. Kaplan- Meier algorithm and Cox regression were then performed to detect those variables statistically associated with the clinical outcome. Results: Eighty-four implants were inserted in 11 patients. Implants were inserted to replace 22 incisors, 21 cuspids, 20 premolars, and 21 molars. The mean follow-up was 17 months. Two of 84 implants were lost (ie, survival rate = 97.6%), and no differences were de- tected among the studied variables. By using the 82 fixtures pro- cessed with Kaplan-Meier and Cox regression, only implant site has an impact on clinical outcome, and molars have a worse outcome than incisors.
Conclusion: One-step oral rehabilitation can be used in selected patients. It significantly shortened the time of rehabilitation without adverse effects. Femur homograft derived from living donors is a valuable material for grafting jaw: it is safer, cheap, and available in programmed amounts and avoids a second operation field
Aneurismal bone cyst: a conservative surgical technique : A case report treated with a small access osteotomy
No full textBackground Aneurismal bone cysts (ABCs) are benign, non-neoplastic, expansive, and locally destructive lesions that may occur rarely. They are well defined and usually occur in the long bones, pelvis and vertebrae. According to the 2005 World Health Organization (WHO) histological classification of odontogenic tumours, ABC is classified as a bonerelated lesion as ossyfing fibroma, fibrous dysplasia, osseous dysplasia, central giant cell lesion (granuloma- CGCL), cherubism and simple bone cyst (SBC). ABCs, as CGCLs and SBCs may arise as a consequence of an earlier trauma causing an overflow of blood into the bone, though a number of pathogenic theories have been put forward. The aim of this study is to present an unusual case of aneurismal bone cyst and to compare the different possibilities of surgical treatment after review of the literature. Case report ABC was localised in the posterior right region of the mandible in an 11-year-old boy, and removed by a surgical procedure involving a small access osteotomy of the mandibular ramus with removal of the cortical bone in order to enucleate the whole lesion, the wisdom tooth and to preserve the healthy bone
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
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