570 research outputs found
De Angelis M., Gallo G. and Gobbetti M. Attività fitasica e beta-glucosidasica dei batteri lattici del “lievito naturale”
No full textFitting of monolithic (full-contour) versus layered lithium disilicate all-ceramic crowns
No full textOBJECTIVES. Monolithic all-ceramic fixed partial dentures are reported to be cost-effective and more resistant than layered counterparts. Monolithic crowns are more resistant to a type of failure called chipping and also aesthetically acceptable.Lithium disilicate blocks can be milled to obtain aesthetic, stronger and cheaper prosthetic manufacturing: without layering, lead times and costs are highly reduced.Although monolithic crowns seem to be more advantageous, during the layering process, crowns are submitted to the same thermic cycle as the monolithic, but this may yield different results as to marginal gaps. The aim of this study is to compare the fitting of monolithic and layered lithium disilicate all-ceramic crowns using the replica technique.MATERIALS AND METHODS. An upper incisor and a canine were prepared to receive ceramic restoration. For each tooth, 6 monolithic and 6 layered crowns were replicated using CAD/CAM technology and IPS e. max (R) CAD lithium disilicate blocks (Ivoclar-Vivadent, Shaan, Liechtenstein), thus obtaining 24 crowns divided into 4 groups: Group A, layered incisors; Group B, layered canines; Group C, monolithic incisors; Group D, monolithic canines. In order to determine the marginal gap, materials of two different colours were used for the replica technique. When the replica was obtained, it was cut into four pieces and observed through the microscope and the four marginal points could be measured thanks to the two different material colours.RESULTS. All crowns showed a marginal gap of over 100 mu m with different valuves in each group; such differences, however, are not statistically significant and are neither correlated with the fabrication technique, nor with the type of tooth.CONCLUSIONS. There is no statistical significance in the difference between monolithic and layered crowns marginal gaps. Although both types of crowns were obtained with the same CAD/CAM technology, the layering process is not involved in the precision level of marginal gaps
Exploring virtual prototypes using time-critical rendering techniques
No full textScientists at CRS4, the Center for Advanced Studies, Research and Development in Cagliari, Sardinia, Italy, have developed a time-critical rendering algorithm that relies upon a scene description in which objects are represented as multiresolution meshes. In collaboration with other European partners, this technique has been applied to the visual and collaborative exploration of large digital mock-ups.Pubblicat
Microbiologia delle uova e degli ovoprodotti
No full textL’uovo costituisce uno degli alimenti di origine animale più completi dal punto di vista nutrizionale e più diffusi nelle diete di tutto il mondo, grazie alla sua versatilità d’impiego in diverse formulazioni e al suo basso costo. La valutazione della sicurezza e della qualità di questo prodotto è fondamentale a causa della sua intrinseca deperibilità e dell’elevata probabilità di contaminazione lungo la filiera produttiva e
distributiva. In questo capitolo vengono affrontati e approfonditi gli aspetti igienici relativi alla produzione e trasformazione dell’uovo e dei suoi derivati, nonché alcune informazioni relative alla normativa che ne regolamenta il settore
Inibizione di attività endo ed amino-peptidasiche da peptidi generati nel corso dei processi di caseificazione e di produzione di lievitati da forno
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Bioactive peptides in dairy products: synthesis and interaction with proteolytic enzymes
No full textMicroflora degli impasti acidi. Biodiversità di batteri lattici correlata ad aspetti biotecnologici della panificazione
No full textPeptides from several Italian cheeses inhibitory to proteolytic enzymes of lactic acid bacteria, Pseudomonas fluorescens ATCC 948 and to Angiotensin-I ¬Converting Enzyme
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