Platform switching on wide-diameter external hex implants a finite element analysis

Objectives: The objective of this work was to use finite element analysis to compare the effect of forces coming to bear on abutments 4.1 or 5.0 mm in diameter connected to a 5.0 mm implant (i.e. with or without platform swit - ching). Study design: A 3D CAD model of a 5 x 11.5 mm external hex implant was developed, complete with a connection screw and either of two abutments, one 4.1 and the other 5 mm in diameter, to assess the influence of two loading conditions, i.e. 200 N loaded either axially or off center on the top of the abutment. Results and conclusions: In the symmetrically loaded models, greater stresses were transmitted to the bone in the area below the neck of the implant in the case of the wider-diameter abutment. When the narrower abutment was considered, the stress lines remained confined to the metal and were transferred to the bone in a more distal position. When the stresses in the bone where compared under non-symmetrical loading of the larger- and smaller-diameter abutments, the stresses reached lower values in the latter case. These findings indicate that platform switching (i.e. coupling a 4.1 mm abutment with a 5 mm implant) achieves a better, more even distribution of the peri-implant stresses deriving from simulated occlusal loads on the bone margins

Biopolymers for Hard and Soft Engineered Tissues: Application in Odontoiatric and Plastic Surgery Field

The goal of modern dentistry and plastic surgery is to restore the patient to normal function, health and aesthetics, regardless of the disease or injury to the stomatognathic and cutaneous system respectively. In recent years tissue engineering and regenerative medicine have yielded many novel tissue replacements and implementation strategies. Scientific advances in biomaterials, stem cell isolation, growth and differentiation factors and biomimetic environments have created unique opportunities to fabricate tissues in the laboratory. Repairing of bone and skin is likely to become of clinical interest when three dimensional tissue reconstructive procedures and the appropriate supporting biomimetic materials are correctly assembled. In the present review, we provide an overview of the most promising biopolymers that may find clinical application in dento-maxillo-facial and plastic surgery

Gateways as inter-modal nodes in different ages: The Venetian region, eighteenth to twentieth centuries

This paper focuses on the theoretical implications of a regional case studyfor the analysis of transportation networks and gateway functions. Thestarting point is the result of a research on the changing role of gateways,and on the relocation of the gateway function from one city to a series ofcities in the Venetian region from the eighteenth to the twentieth century.Against this evolution, I test the validity and usefulness of a definition of thegateway as a point of inter-modal exchange for its historical interpretation.Changing transport technologies involve different organisations of inter-modal exchanges, and imply more or less intense economic functions ofgateway cities. These changes intertwine with political events and deci-sions, and more general economic changes: they could at the same time beread as an effect of these transformations, and as a causal factor. From this perspective, a study of intermodality shows to be useful to shed new lighton specific changes in the structure of urban hierarchie

Japanese Teachers at the Royal School of Commerce (1873-1923)

Only five years after the Royal Superior School of Commerce (the present Ca' Foscari University) was founded in 1868, the School introduced, for the first time in Italy, Japanese language courses taught by native speakers. The classes started in 1873 and continued until 1888, and were again part of the curriculum from 1909 to 1923. In those years a little number of very active Japanese teachers (interprets, linguists, sculptors and painters) contributed to shaping the education in Japanese of Italian students, who in turn went on to direct Japanese instruction in Italy. Their guiding spirit was Guglielmo Berchet, a tireless promoter of Italo-Japanese relations

Foreign rule?: transnational, national, and local perspectives on Venice and Venetia within the “multinational” empire

The history of the Habsburg Empire in the post-Napoleonic era is frequently approached from the perspective of its various component nationalities. These were traditionally portrayed in the historiography as engaged in more-or-less open struggle with control from Vienna. This article argues that the over-privileging of such national categories can distort the picture. By looking at a number of case studies – the naming of Lombardy-Venetia, the Biblioteca italiana, the Panteon veneto – the relationship between Venice (and its Terraferma) and Habsburg rule during the second Austrian domination is examined. It will be argued that it is more profitable to see Venetian identities (municipal, local, Italian, and as part of a wider transnational European culture) as capable of working for as well as against the empire, and that Habsburg policy was as often concerned with managing potential local rivalries (notably between Lombards and Venetians) as with controlling a perceived Italian threat. It is also suggested that, while cultivation of local identity was often used to reinforce the national, the Austrian authorities were also happy to annex both to further imperial interests

Complications associated with implant migration into the maxillary sinus cavity

Background Migration of dental implants into the maxillary sinus is an uncommon, but increasingly reported complication. Implant migration may result from initial lack of primary stability, intrasinusal and nasal pressure changes, autoimmune reaction to the implant or incorrect distribution of occlusal forces. This retrospective study aims at analyzing the factors that may influence implant migration into the maxillary sinus cavity. Material and methods Fourteen patients presenting a total 15 implants that migrated into the maxillary sinus were recruited. Diagnosis of this complication was based on imaging techniques, such as cone beam computerized tomography scan and panoramic radiography. Clinical data were recorded in all cases and processed for statistical analysis. Results ABH was below 6 mm in the majority of cases. However, almost 50% of the patients did not receive any site preparation treatment prior to implant insertion. Five patients (33.3%) were treated by osteotome techniques, but only one of them had bone grafting. Therefore, 73.3% of sites did not receive any biomaterial to increase available bone height. The most common complication‐associated factors found on this study were related to implant design (cylindrical), implant dimension (diameter), implant restoration/rehabilitation method (partial removable denture), site‐specific anatomy (initial residual bone height between 5 and 6.9 mm), demographics (age), and biomaterials. Conclusion Patient selection and proper treatment planning, as well as the application of the appropriate sinus augmentation technique, are critical aspects that should be controlled to minimize the risk of implant migration into the maxillary sinus cavity. [Correction added after online publication August 17 2011: The Conclusion was revised to provide better clarity to the reader.]Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/93739/1/clr2278.pd

Francesco Ferrara, il primo degli economisti cafoscarini

The paper presents the important personality of the great Italian economist Francesco Ferrara who has been the first Director of the new School of Commerce founded in Venice in 1868. The paper is divided in two parts: the first part presents the main features of Francesco Ferrara as an economist, showing how he was clearly a supporter of a free-market oriented vision of the economic analysis and of the economic policy, not liking at all a vision of the economic analysis separated from the political implications, but definitely favouring a political economy vision. He was a sharp opponent of socialism, although admiring the logical power of Marx's thought, but not Marxian ideas. But he was also an opponent of intermediate visions leading to mediations in the field of economic policy. His rather radical positions led him to resign from the role of minister of Finance. In the second part the paper shows how Ferrara accepted the proposal of Luigi Luzzatti to be appointed as director of new School of Commerce of Ca' Foscari in summer 1868; the paper shows how the relations between Ferrara and Luzzatti were characterized by polemical moments, both because of the lines followed by Ferrara in appointing the professors of the new school and because of the openness shown by Luzzatti, and not liked at all by Ferrara, towards policies showing a favorable attitude towards social interventions. Eventually the disagreements were solved. Finally, the paper shows how Ferrara succeeded in appointing at Ca' Foscari some of the most important Italian economists of his time, such as Maffeo Pantaleoni