1,720,967 research outputs found
Calcolosi delle ghiandole salivari minori. Sialoliths of the minor salivary glands
No full textObiettivo: Riportare il caso di una paziente con una tumefazione non dolente del palato duro. Materiali e metodi: Si presentava alla nostra osservazione una paziente di 67 anni con una tumefazione del palato duro avente dimensioni di 1,7 x 1,4 cm. La lesione si era sviluppata nei due anni precedenti causando disturbi funzionali alla masticazione e all’eloquio. All’esame TC la formazione appariva radiopaca con margini netti e osteosclerotici; inoltre risultava completamente isolata dalle strutture ossee adiacenti. Risultati: Si è optato per l’escissione completa della lesione. L’esame istologico ha permesso di porre diagnosi di calcolosi delle ghiandole salivari minori.MATERIALS AND METHODS. A 67-yearold woman presenting with a 1.7 x 1.4 cm
mass arising from the hard palate was
referred to our Department. The lesion
had been slowly growing for two years
and had caused her difficulties in chewing and speaking. CT examination of the
mass revealed a mixed content, almost
completely isolated from the underlying
bone, more opaque at the periphery than
at the core and resembling a cortico-cancellous structure.
RESULTS. The lesion was removed completely under local anesthesia, including
both the mucous capsule and the calcified
core. Macroscopic and microscopic findings made it possible to formulate a diagnosis of minor salivary gland lithiasis
A rare case of odontoma [Un raro caso di odontoma]
No full textOBJECTIVES. The aim of this study is to report a rare localization of a compound odontoma in the mandible, discovered accidentally on an orthopantomogram (OPT). MATERIALS AND METHODS. We report the case of a 22 years-old male patient referred to our department and presenting with impaction of lower third molars. OPT exam confirmed the suspect of compound odontoma surrounding the apexes of teeth 3.4 and 3.5, which is an unusual site of presentation for compound odontomas. CT exam revealed the boundaries of the lesion and its close contact with IAN (Inferior Alveolar Nerve). The surgical procedure can be described as follows: 1) regional anesthesia and triangular intrasulcular incision between 3.3 and 3.7; 2) exposure of bone, debridement just below the apexes of teeth 3.4 and 3.5; 3) denticles extraction; 4) revision of the surgical site, detection of the intact IAN and rinsing; 5) cavity filling with fibrin sponge and flap suture. RESULTS. Histological examination confirmed the working diagnosis: fibrous connective tissue sac surrounding the denticles. The dental tissues forming these denticles consist of a central core similar to pulp tissue, surrounded by primary dentin and covered with partially demineralized enamel and primary cement. In spite of the denticles close adherence to IAN, the patient was asymptomatic with no evidence of nerve injury one month after surgery. Moreover, the subsequent radiographic controls showed the complete recovery of the bone at one year after surgery. CONCLUSIONS. Odontomas are not really rare hamartomas in the general practice of oral and maxillofacial surgeons. The most common location is the anterior region of the maxilla (67%), as compared with the mandible (33%), but the peculiarity of this case was the location of a multiple odontoma in the posterior mandible. Usually, odontomas may cause disturbances in the eruption of teeth such as impaction, delayed eruption or retention of primary teeth; in those cases or in the event of any dentition anomaly or jaw deformation in children or adolescents, it is very important to investigate the presence of possible odontomas with radiographic examinations. In the above case, no delayed eruption was found. The radiographs alone enabled us to identify the firm adherence of the odontoma to the alveolar nerve and to prevent possible nerve compression consequences. The lesion was surgically excised in a conservative way, using an intraoral approach with total anesthesia, to ensure that the nerve is preserved
Critical review of literature on the use of short implants
Full text linkAim The aims of this review were to verify the validity of short implants as a treatment option in patients with partial or total edentulism, having more or less atrophic jawbones. Methods A systematic review of randomized controlled trials (RCT) was conducted, involving also prospective and retrospective studies published in English language between January 2005 and December 2015. The PubMed and Scopus databases were electronically analyzed. Titles and abstracts were selected, and full texts were evaluated. The data were organized in tables and then presented as a narrative analysis. Results The electronic search provided 891 publications, 50 articles were retrieved in full text and only 11 were included in the review. Although the performance of the implants was evaluated through different success and survival criteria, short implants have shown to have a similar performance to longer implants. Conclusions Short implants could be considered as a treatment option comparable to traditional lenght implant. However, other studies must be conducted to assess uniform criteria to state the quality of treatment
Biologically derived gels for the cleaning of historical and artistic metal heritage
Full text linkIn the general global rise of attention and research to seek greener attitudes, the field of cultural heritage (CH) makes no exception. In the last decades, an increasing number of sustainable and biologically based solutions have been proposed for the protection and care of artworks. Additionally, the safety of the target artwork and the operator must be kept as core goals. Within this scenario, new products and treatments should be explored and implemented in the common conservation praxes. Therefore, this review addressing metal heritage is aimed to report biologically derived gel formulations already proposed for this specific area as reliable tools for cleaning. Promising bio-gel-based protocols, still to be implemented in metal conservation, are also presented to promote their investigation by stakeholders in metal conservation. After an opening overview on the common practices for cleaning metallic surfaces in CH, the focus will be moved onto the potentialities of gel-alternatives and in particular of ones with a biological origin. In more detail, we displayed water-gels (i.e., hydrogels) and solvent-gels (i.e., organogels) together with particular attention to bio-solvents. The discussion is closed in light of the state-of-the-art and future perspectives
Biocleaning of historical metal artworks: innovative green gels amended with microbial derivatives
Full text linkThe research study is aimed to design innovative bio-gel formulations able to tackle altered historical metal artworks in a green and sustainable perspective. The target of the research is the removal of undesired or altered materials of both inorganic (i.e., corrosion and tarnishing) and organic nature (i.e., protective coatings). The designed gel systems are initially assessed on mock-ups. Iron-, copper- and silver-based substrates, chosen as mostly present in historical metal collections, are chemically aged to form corrosion on the surface. Alternatively, they are coated with organic protectives (i.e., acrylic and nitrocellulose varnish) that are mostly used for indoor metal care. After multi-modal analytical assessment to check the action and safety of the gels on the metal mock-ups, the developed solutions are applied on real cases, thanks to the strong and fruitful collaboration with curators and conservators of metal artworks
Innovative perspective for the cleaning of historical iron heritage: novel bio-organogel for the combined removal of undesired organic coatings and corrosion
No full textAn innovative green organogel was designed to simultaneously tackle inorganic compounds (i.e., iron corrosion) and organic substances (i.e., acrylic coatings) as undesired materials possibly present on the surface of altered indoor metal artworks. Poly-3-hydroxybutyrate (PHB), ethyl lactate (EL), and deferoxamine B (DFO) were employed in the formulation as thickening agent, organic solvent, and complexing agent, respectively, aiming to propose a sustainable and less harmful chemical cleaning method for metal care. The components were selected because they are bio-sourced, renewable, biodegradable, and non- or low-toxic materials. A multi-modal protocol of analysis was carried out to characterise the newly designed PHB-EL-DFO organogel. The cleaning performance of the novel formulation was assessed on mild steel mock-ups presenting both corrosion and organic coating to be removed. The conducted multi-analytical approach verified that the PHB-EL-DFO gel was able to tackle the two undesired materials simultaneously in an adjustable and easy-to-use way thanks to a modular application
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
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