1,720,965 research outputs found
Full-Arch Vertical Reconstruction of an Extremely Atrophic Mandible With "Box Technique." A Novel Surgical Procedure: A Clinical and Histologic Case Report
No full textPurpose: To describe a new augmentation procedure named "box technique" for bone reconstruction in a severely atrophic jaw with mandibular and mental nerve dehiscence. Material and Methods: The first surgical box technique procedure was performed to augment the atrophic posterior area. Simultaneously, 2 implants were inserted into the interforaminal zone to stabilize the denture. After 6 months, 2 implants were positioned in the regenerated bone, and a second box technique procedure was performed to reconstruct the ridge in the area of fixture exposition. Six months after the second surgery, the patient was rehabilitated with a removable prosthesis retained on 4 implants. Results: The clinical and histologic analyses highlighted outstanding healing resulting from this vertical and horizontal allografting and included complete resorption of poly D,L-lactide meshes and substitution of the mineralized human bone allograft with an excellent quality new bone formation. Conclusions: Results confirm the effectiveness of the technique, which needs a further case series study endorsing its reliability. (Implant Dent 2013;22:2-7
Two-Stage Crestal Sinus Elevation by Sequential Drills in Less Than 4 mm of Residual Ridge Height
No full textPurpose: The aim of this work, the first human histologic case report of this technique, was a clinical and histologic evaluation of implant placed in a severely atrophic maxilla using a 2-stage crestal sinus elevation.
Case Presentation: A 52-year-old woman required rehabilitation of an atrophic maxilla with a fixed implant-supported prosthesis. At the first surgery, a crestal sinus lift was performed using beta-tricalcium phosphate (beta-TCP), as radiographic tracer, and mineralized human bone allograft (MHBA) as grafting material. After 6 months, a bone core biopsy was taken, and 2 implants were placed in the augmented sites. Four months later, implants were exposed, and 2 splinted gold-porcelain crowns were delivered. Histology highlighted basal bone disappearance, replaced by a wide composite network (similar to 50% vol/vol) of MHBA granules connected by newly formed bone, and osteoblastic activities.
Conclusion: This case report demonstrates the possibility of executing a staged transcrestal sinus lift in atrophic situations. MHBA evidenced usefulness in maintaining bone volume. Histologic analyses confirmed the sound outcome of the graft augmentation. Additional studies would be beneficial to confirm or refute the reliability of this technique
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
Lymphoepithelial cyst of the pancreas. Report of two cases and review of the literature.
No full textLymphoepithelial cyst of the pancreas (LC) is a very rare benign lesion and preoperative diagnosis is difficult. Conservative surgery seems to be the appropriate therapy in symptomatic patients or when a precise preoperative diagnosis is not achieved. The benign behavior of all reported cases suggests that the asymptomatic patients with a certain morphological preoperative diagnosis might be clinically followed up. The histogenesis of LC remains to be elucidated.LC of the pancreas is a cyst that is histologically characterized by a fibrous tissue, a lymphoid component and a lining squamous epithelium.Clinical and pathological findings of two personal cases are reported with review of the literature.A 56-yr-old man, complaining of epigastric pain, and a 47-yr-old man, with a history of alcohol abuse, were admitted to hospital. In both cases the lesion was detected with abdominal ultrasound but a certain diagnosis was obtained only after histological examination of the resected cysts
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
Preoperative diagnosis of renal angiomyolipoma: fine needle aspiration cytology and immunocytochemical characterization
No full textA preoperative diagnosis of renal angiomyolipoma (AML) is of great importance for a correct management of these patients with this tumor. In fact when the lesion is small and asymptomatic a conservative approach may be considered. We have evaluated the radiographic and fine needle aspiration cytology (FNAB) findings in 8 cases of AML. In 3 cases both radiology and cytology were suggestive of carcinoma and thus the patients underwent surgery. In one case both techniques suggested AML but surgery was performed because the lesion was large and symptomatic. In 4 cases where both radiology and cytology suggested AML no surgery was performed. Follow-up data are consistent with the benign nature of the lesions. The immunocytochemical analysis of the FNAB with a panel of antibodies including keratin, vimentin, actin and HMB-45 was indicative of AML in 7 of 8 cases, including 2 of the 3 cases misdiagnosed as carcinomas. The presence of HMB-45-positive perivascular epithelioid cells in the FNABs was the most significant finding. It is concluded that immunocytochemical analysis of FNAB with this monoclonal antibody panel can increase the accuracy of preoperative diagnosis of AML, and allow consideration of a conservative approach in selected cases
Retroperitoneal paragangliomas: role of immunohistochemistry in the diagnosis of malignancy and in assessment of prognosis.
No full textTo present our experience of 10 patients with extra-adrenal retroperitoneal paragangliomas, and assess prognostic tests.Retrospective study of casenotes.University hospital, Italy.10 Patients who presented with paragangliomas between 1970 and 1991.Histological and immunohistochemical results, and outcome.All tumours were completely resected and there was no operative mortality. Of the 8 patients who had no metastases at presentation 3 died of recurrence 3, 5, and 10 years later, respectively; 4 were alive and free of disease 2-7 years after diagnosis. The 2 patients with synchronous bone metastases at presentation died 1 and 4 years later. Immunohistochemical analysis of type I cells (chromogranin A and neurone-specific enolase) showed little correlation with progression of disease, but there was a correlation between the presence of type II cells (S100 protein) and good prognosis.Excision is the treatment of choice for paraganglioma. Immunohistochemical techniques may provide useful information about prognosis, in particular about those patients who are at increased risk of recurrence. Long term follow up is essential, because successful management of recurrence is dependent on early recognition
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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