1,721,052 research outputs found
INFLUENZA DI DIVERSE SUPERFICI IMPLANTARI SULL'ACCUMULO DI PLACCA E IL COMPORTAMENTO DEI TESSUTI PERIIMPLANTARI. Studio clinico a 12 mesi
No full textOBIETTIVI: Valutare l’accumulo di placca e la risposta dei tessuti periimplantari a contatto con impianti con superficie sottoposta a doppia mordenzatura acida (DAE) (test) e con impianti con superficie DAE e una porzione coronale macchinata (controllo), simulando la loro esposizione nel cavo orale
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
Fattori chirurgici-protesici nell’inserimento implantare postestrattivo immediato in area estetica:caso clinico
No full textL’inserimento degli impianti in una posizione ideale, protesicamente guidata, può essere osta-colato dall’insufficiente disponibilità di volumi ossei nei siti postestrattivi di aree ad alta valenza estetica. Negli ultimi anni è stato proposto da diversi autori un approccio chirurgico, noto come preservazione dell’osso alveolare (Alveolar Ridge Preservation, ARP), allo scopo di ridurre al minimo le variazioni dimensionali successive all’avulsione dentale. L’ARP comprende un’ampia varietà di procedure, che consistono principalmente nell’impiego di materiali d’innesto per il riempimento dell’alveolo, da soli o in combinazione con membrane riassorbibili-non riassorbibili e l’allestimento di lembi chirurgici a copertura del difetto. Dall’analisi delle revisioni sistematiche e meta-analisi attualmente disponibili in letteratura, le tecniche ARP sembrano offrire vantaggi piuttosto limitati rispetto alla guarigione spontanea dell’alveolo. Inoltre, resta ancora acceso il dibattito su quale fra le varie tecniche di ARP mostri maggior efficacia nel mantenimento delle dimensioni dell’osso alveolare residuo e sul ruolo dell’ARP in merito al miglioramento dei risultati clinici di sopravvivenza implantare. In questo articolo viene riportato un caso clinico di inserimen-to implantare immediato nell’alveolo postestrattivo di un incisivo centrale senza utilizzo di innesti ossei, allo scopo di mostrare come la corretta gestione dei fattori chirurgici (posizionamento implantare palatino con mantenimento dell’integrità della corticale ossea vestibolare) e protesici (condizionamento dei tessuti molli attraverso il provvisorio immediato) sia determinante per il successo clinico delle riabilitazioni implantari nei siti postestrattivi di aree estetiche.The implant placement in the ideal prosthetic position could be complicated if insufficient bone volumes are available in post-extractive sites of highly aesthetic areas. In recent years a surgical approach, known as alveolar ridge preservation (ARP), has been proposed to reduce the dimensional changes of the bone following tooth loss. ARP includes a large amount of techniques, mainlyconsisting in the use of graft materials to fill the socket alone or in combination with resorbable/not resorbable barriers and/or surgical flaps aimed to cover the bone defect. According to available meta-analysis andsystematic reviews of the Literature, ARP techniques do not seem to offer limited advantagescompared to socket spontaneous healing. Moreover, there is still a debate concerning which among the various ARP techniques shows higher efficacy in keeping residual alveolar bone volumes, as well as the ARP role in improving implant-related outcomes. In the present paper it is reported a clinical case of immediate implant placement in central incisor post-extractive socket without the use of bone graft, in order to show how the proper management of surgical factors (implant placement in palatine position with the maintenance of buccal cortical bone integrity) and prosthodontic factors (soft tissues conditioning with the relining of the acrylic resin provisional crown) is essential for the clinical success of implant-supported rehabilitations in post-extractive sites of aesthetic area
ISOLATION OF STAPHYLOCOCCUS AUREUS AND PROGRESSION OF PERIODONTAL LESIONS IN AGGRESSIVE PERIODONTITIS
No full textThis work evaluates whether isolation and toxicity of subgingival Staphylococcus aureus strains correlate with progression of periodontal lesions and whether isolates are characterized by a specific genomic background. The study involved 165 subjects affected by generalized aggressive periodontitis. Three sets of samples of supragingival and subgingival plaque were obtained at 45-day intervals from active and non-active sites, to detect S. aureus. Susceptibility to antibiotics, the presence of 17 genes, genomic restriction profiles and multilocus sequence typing (MLST) were performed to characterize all isolates. S. aureus was detected in 37.6% of the subjects. Subgingival colonization rates were 66.1% and 12.9% for active and non-active sites, respectively (P<0.01). Supragingival and subgingival isolates were shown to be distinct by molecular genotyping and DNA fingerprint analysis. MLST showed that isolates were not genetically related and no sequence type was predominant in any of the two locations. These data demonstrate that S. aureus is associated with the progression of aggressive periodontitis and that a specific set of characters is necessary for the bacterium to colonize subgingival sites. Comparative analysis of genomic structure and genetic-related data suggest that the periodontal environment could promote genetic evolution of strains
Präzision und Genauigkeit eines digitalen Abformscanners: Implantatprothetische Rehabilitation im unbezahnten Kiefer
No full textZiel der geschilderten Studie war, die Genauigkeit und Präzision eines digitalen Scanners beim Scannen von vier nach einem Sofortbelastungsprotokoll eingesetzten Implantaten zu untersuchen und die Genauigkeit eines Aluminiumgerüstes zu bestimmen, das auf der Grundlage einer digitalen Abformung gefertigt wurde. Die digitale Abformung erwies sich als zuverlässige Methode für die Herstellung von implantatgetragenen Full-arch-Substrukturen mit guter spannungsfreier Passung auf angulierten Implantaten
Sinus floor elevation using osteotomes or piezoelectric surgery
No full textThe aim of this paper is to describe a technique for sinus floor augmentation with a 1-step crestal approach where the residual bone is ≤ 7.5mm. 36 implants were installed in 25 patients in the atrophic posterior maxilla immediately after sinus floor elevation. Sinus floor elevation was performed with a crestal approach using either osteotomes and burs or piezosurgery. Standardized intraoral radiographs were taken prior to surgery and 1 year after surgery. The mean residual bone height was 5.61 mm (range 3-7.5mm). The mean gain of sinus elevation was 6.78 mm (range 3.5-10mm) at 1 year after surgery. Two patients dropped out of the study. Of the 23 patients completing the study, one implant failed, whilst the remaining 33 implants were stable 12 months after surgery (cumulative survival rate 97%). A statistically significantly higher bone height was achieved with tapered implants compared with cylindrical implants (P<0.05). No statistically significant differences were found in bone level using osteotomes or piezosurgery. Piezosurgery was considered to provide less discomfort for the patient and greater convenience for the surgeo
Adhesive strength of the luting technique for passively fitting screw-retained implant-supported prostheses: an in vitro evaluation.
No full textPURPOSE: This in vitro study evaluated the adhesive strength of a technique to lute implant cylinders to metal frameworks in implant-supported prostheses and ensure a good passive fit. MATERIALS AND METHODS: Different height samples were tested: In group 1, implant cylinders were 5 mm long; in group 2, they were 10 mm long. A universal testing machine (Instron) was used to perform pullout tests. RESULTS: The luting technique provided enough adhesive strength for clinical use with greater adhesive strength in group 2 (mean pull-out strength: 2.85 kN in group 1 versus 3.79 kN in group 2). CONCLUSIONS: The luting technique provides enough adhesive strength for clinical use. Moreover, specimens with a larger surface for adhesion demonstrated higher adhesive strength compared with shorter specimens
- …
