1,720,964 research outputs found
Use of monolithic lithium disilicate for implant abutment and crown: A clinical report
No full textBackground Lithium disilicate is usually used for producing prosthetic crowns to be cemented on teeth or implant abutments. On the contrary, its use for producing implant abutment is not reported. This report describes the use of monolithic lithium disilicate to realize implant abutment and crown. Case report A 60-year-old male patient required dental implant restoration for replacing the upper right central incisor. A lithium disilicate abutment and crown were realized by pressing. Conclusion Lithium disilicate may be a valid alternative to zirconia for producing implant abutments in the esthetic area
A lithium disilicate cantilever bridge to replace a maxillary lateral incisor
No full textOBJECTIVES. The rehabilitation of a maxillary lateral incisor by means of a lithium disilicate cantilever bridge is here presented.MATERIALS AND METHODS. The left maxillary central incisor was prepared with a chamfer finishing line. The root of the left maxillary lateral incisor was extracted and an acrylic temporary was placed. After 4 months, the final impression was taken. The lithium disilicate bridge was fabricated by press technique and tried on. After veneering and aesthetic check, the bridge was cemented using a composite cement.RESULTS AND CONCLUSIONS. The 24 months follow-up showed the maintenance of aesthetic and functional integration of the rehabilitation. Lithium disilicate can be used to fabricate cantilever anterior bridges in carefully selected cases.OBJECTIVES. The rehabilitation of a maxillary lateral incisor by means of a lithium disilicate cantilever bridge is here presented. MATERIALS AND METHODS. The left maxillary central incisor was prepared with a chamfer finishing line. The root of the left maxillary lateral incisor was extracted and an acrylic temporary was placed. After 4 months, the final impression was taken. The lithium disilicate bridge was fabricated by press technique and tried on. After veneering and aesthetic check, the bridge was cemented using a composite cement. RESULTS AND CONCLUSIONS. The 24 months follow-up showed the maintenance of aesthetic and functional integration of the rehabilitation. Lithium disilicate can be used to fabricate cantilever anterior bridges in carefully selected cases
Implant prosthetic rehabilitation for patient with monolateral cleft lip and palate. A clinical report
No full textCleft lip and palate (CLP) is a malformation of genetic derivation. Nonsyndromic cleft of the lip and/or palate derives from an embryopathy with failure in terms of fusion of the nasal process and/or palatal shelves.
For patients affected by CLP procedures of guided bone regeneration by autologus bone grafting are recognized as the most effective procedures to close oro-nasal communication.
The residual gap of alveolar ridge, determined by the absence of one or more permanent teeth, can be completed by implant-prosthetic rehabilitation. This therapeutic option offers different advantages:
− abbreviation or circumvention of orthodontic treatment period;
− maintenance of symmetric appearance of the maxillary anterior dentition in cases of unilateral cleft;
− preservation of the hard tissues of abutment teeth adjacent to the lacuna;
− support of grafted bone height.
This work describes the rehabilitation of a 19 year-old patient affected by right unilateral CLP with use of titanium implant supporting a single crown, to replace 1.2.
The technique used was particularly helpful for this cleft case, in which a bone deficit subsisted after secondary bone grafting. An additional bone-grafting procedure was necessary at the same time of implant placement, and it was done to achieve best functional and aesthetics results.Cleft lip and palate (CLP) is a malformation of genetic derivation. For patients affected by CLP, procedures of guided bone regeneration by autologous bone grafting are recognized as the most effective to close oronasal communication. The residual gap of alveolar ridge, determined by the absence of 1 or more permanent teeth, can be completed by implant-prosthetic rehabilitation. This kind of rehabilitation for patients with CLP has the aim of completing dental reconstruction by avoiding sacrifice of adjacent teeth and preserving symmetric appearance. This article describes the rehabilitation of an 18-year-old patient affected by right unilateral CLP with use of a titanium implant supporting a single crown to replace the lateral incisor. The technique used was particularly helpful for this cleft case, in which a bone deficit subsisted after secondary bone grafting. An additional bone grafting procedure was performed at the time of implant placement to achieve the best functional and esthetic results. © 2009 by Quintessence Publishing Co Inc
The New Elderly Patient: A Necessary Upgrade
Full text linkThe elderly individual is becoming the most common patient in clinical practice due to the increasing average life span, especially in developed countries. The current elderly patients are different from those of some decades ago. They usually have an active social life, want to be informed, and are actively involved in the current society with consequent high expectations for medical and dental treatment. However, not all the elderly patients are like this. Some of them show limited financial resources, reduced mental and manual skills, and poor motivation. The purpose of this communication is to make a brief characterization of the new elderly population in view of prosthetic and dental management
In Vitro Fracture Strength of Teeth Restored with Lithium Disilicate Onlays with and without Fiber Post Build-Up
No full textTo our knowledge there is no data about the mechanical performance of indirect restoration adhesively cemented on teeth without an adequate build-up to provide the correct geometrical configuration. The aim of this study was to compare the fracture strength of human teeth restored with lithium disilicate onlays, with and without fiber post build-up. Methods: Twenty human mandibular molars were horizontally sectioned and divided into two groups (n = 10). No treatment was applied in group A. Teeth in group B were endodontically treated, built-up using fiber post and composite core and prepared with a circumferential chamfer providing a 1 mm circumferential ferrule. Lithium disilicate onlays were pressed and luted on teeth using dual-curing luting composite. Teeth were tested under static load. Failures were classified as restorable or not restorable. Failure loads were analyzed with one-way analysis of variance. Failure modes were compared using Pearson’s Chi-square tests. Results: The mean fracture loads were 1383.5 N for group A and 1286.3 N for group B. No difference was found (p = 0.6). Ninety per cent of fractures were classified as not restorable in both groups, with no difference (p = 0.8). Conclusions: For teeth restored with adhesive procedures and lithium disilicate onlays, the presence of build-up with fiber post to provide retention and resistance form does not influence the fracture strength
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
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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