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180 results on '"Valletta R"'

7. Evolution of structural and magnetic properties in Ta/Ni81Fe19 multilayer thin films

Author

Hashim, I., Atwater, H.A., Kung, K.T.Y., and Valletta, R. M.

Subjects
Thin films, Multilayered -- Research, Annealing -- Research, Physics
Abstract

The evolution of the structural and magnetic characteristics of Ta/Ni81Fe19 multilayered structures was investigated using small angle x-ray diffraction and transmission electron microscopy. The results suggested that grain growth was concurrent with grain boundary diffusion of Ta in Ni81Fe19. The evolution of the soft magnetic properties of the sample after annealing treatment was consistent with the observed changes in microstructure.

Published
1993

11. Behaviour of human mesenchymal stem cells on chemically synthesized HA-PCL scaffolds for hard tissue regeneration

Author

D'Antò, V, Raucci, M. G., Guarino, V, Martina, S, Valletta, R, Ambrosio, L, D'Antò, V, Raucci, Mg, Guarino, V, Martina, S, Valletta, Rosa, and Ambrosio, L.

Abstract

Our goal was to characterize the response of human mesenchymal stem cells (hMSCs) to a novel composite scaffold for bone tissue engineering. The hydroxyapatite-polycaprolactone (HA-PCL) composite scaffolds were prepared by a sol-gel method at room temperature and the scaffold morphology was investigated by scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) to validate the synthesis process. The response of two different lines of hMSCs, bone-marrow-derived human mesenchymal stem cells (BMSCs) and dental pulp stem cells (DPSCs) in terms of cell proliferation and differentiation into the osteoblastic phenotype, was evaluated using Alamar blue assay, SEM, histology and alkaline phosphatase activity. Our results indicate that tissue engineering by means of composite HA-PCL scaffolds may represent a new therapeutic strategy to repair craniofacial bone defects.

Published
2016

13. NiCl2 Alters Cytokine Secretion of RAW 264.7 Macrophages

Author

D’Antò V, Hiller K. A, Valletta R, Martina R, Schmalz G, Schweikl H, Ambrosio L., SPAGNUOLO, GIANRICO, D’Antò, V, Spagnuolo, Gianrico, Hiller K., A, Valletta, R, Martina, R, Schmalz, G, Schweikl, H, and Ambrosio, L.

Published
2010

14. Sol-gel materials for hard tissue engineering

Author

D'Antò V., De Santis R., Catauro M., Gloria A., Valletta R., Martina R., RENGO, SANDRO, D'Antò, V., De Santis, R., Catauro, M., Gloria, A., Valletta, R., Martina, R., and Rengo, Sandro

Published
2009

16. Cytotoxicity of nickel chloride and his effect on cell cycle

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, Polito I., D'Antò V., Martina R., NETTI, PAOLO ANTONIO, Valletta R., Spagnuolo, Gianrico, Polito, I., D'Antò, V., Martina, R., Netti, PAOLO ANTONIO, Rengo, Sandro, and Valletta, R.

Published
2008

20. Effect of nickel on Hacat and U2OS proliferation

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, Politi I., D'Amore R., Di Caprio M. P., Martina R., Valletta R., Spagnuolo, Gianrico, Rengo, Sandro, Politi, I., D'Amore, R., Di Caprio, M. P., Martina, R., and Valletta, R.

Published
2007

21. NF k-B Role in Nickel Induced Cell Death

Author

Uomo R, D'Antò, Valletta R, Schweikl H, Schmalz G, Martina R., SPAGNUOLO, GIANRICO, Uomo, R, D'Antò, Valletta, R, Schweikl, H, Schmalz, G, Spagnuolo, Gianrico, and Martina, R.

Published
2007

22. Hema effect on ERK and PI3K/AKT survival pathways in HPC

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, D'Antò V., Schweikl H., Valletta R., Schmalz G., Martina R., Spagnuolo, Gianrico, D'Antò, V., Schweikl, H., Valletta, R., Schmalz, G., Martina, R., and Rengo, Sandro

Published
2006

30. Magnetic force microscopy with batch-fabricated force sensors.

Author

Grütter, P., Rugar, D., Mamin, H. J., Castillo, G., Lin, C.-J., McFadyen, I. R., Valletta, R. M., Wolter, O., Bayer, T., and Greschner, J.

Subjects
MAGNETIC force microscopy, TACTILE sensors, MAGNETIC films, COBALT alloys, IRON-nickel alloys
Abstract

Presents a study which analyzed the properties of force sensors suitable for magnetic force microscopy that were made by coating silicon microcantilevers with various thin film magnetic films. Numerical calculations; Imaging with cobalt platinum chromium thin film tips; Discussion of imaging with thin film nickel iron permalloy tips.

Published
1991

38. [6 classes of Burstone: typodont evaluation]

Author

Alberto Laino, Boscaino F, Valletta R, Laino, Alberto, F., Boscaino, and Valletta, Rosa

Subjects
Dental Stress Analysis, Orthodontic Appliances, Orthodontic Wires, Orthodontic, Dental Stress Analysis, Orthodontic Appliances, Orthodontic Wires, Corrective, Orthodontics, Corrective, methods
Abstract

The knowledge of force systems which are produced by orthodontic appliance is one of precondition for a rationale Orthodontic pretreatment. This article describes the force system developing when a straight wire is placed in two nonalligned brackets, to examine to typodont what is analysed by Burstone and Koenig in their study on six Classes.

Published
1990

44. Batch fabricated sensors for magnetic force microscopy

Author

Grütter, P., primary, Rugar, D., additional, Mamin, H. J., additional, Castillo, G., additional, Lambert, S. E., additional, Lin, C.‐J., additional, Valletta, R. M., additional, Wolter, O., additional, Bayer, T., additional, and Greschner, J., additional

Published
1990
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45. Mandibular coronoid process tumor resembling a mandibular condyle: A case report

Author

Cimino Roberta, Piombino Pasquale, De Riu Giacomo, Mascolo Massimo, Vollaro Stefano, Valletta Rosa, Michelotti Ambrosina, and Califano Luigi

Subjects
Surgery, RD1-811
Abstract

Abnormal elongation of mandibular coronoid process, often defined as coronoid hyperplasia, is a rare condition, which is frequently associated with limited mouth opening. In some cases, the enlarged coronoid pushes the zygoma forward causing facial asymmetry. This case report describes a 16-year-old boy whose chief complaint was a progressive difficulty and deviation in mouth opening, together with a deformity appearing at maximum opening at the zygomatic area. The diagnosis was Unilateral Accessory Mandibular Condyle at coronoid process, without reduction of the mouth opening capacity. A coronoidectomy was carried out by means of piezoelectric surgery, instead of a coronoidotomy which is usually performed in these cases, due to a suspect of ramus neoplasm. Keywords: Coronoid hyperplasia, Accessory condyle, Temporomandibular disorder, Piezoelectric surgery, Adolescent

Published
2019
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46. Su alcuni casi di rimozione obbligata di implantoprotesi: riflessioni cliniche ed implicazioni medico-legali

Author

BUCCELLI, CLAUDIO, Bucci E., Amato M., Valletta R., Buccelli, Claudio, Bucci, E., Amato, M., and Valletta, R.

Abstract

Gli A.A., rilevata la relativa carenza di studi e di ricerca in ordine ai problemi medico-legali posti dalla implantologia dentaria, presentano una casistica di rimozioni obbligate di impianti ricorsi alla loro osservazione in parte per motivazioni di ordine clinico ed in parte per finalità di tipo peritale. Analizzano per ciascun caso i motivi di insuccesso della tecnica e prendo spunto dall’esperienza considerata prospettano le più frequenti cause di errori giuridicamente rilevante nell’attività implantologica. Si soffermano sulle indicazioni che legittimano il ricorso alla metodica, specificandone anche le controindicazioni. Sottolineano inoltre, per la validità del consenso alla terapia, l’inderogabile necessità ad una rigorosa ed esauriente attività di informativa al paziente sulla metodica da intraprendere, trattandosi di interventi gravati dalla probabilità di esiti non favorevoli, anche con effetti peggiorativi. Prospettano, infine, le ipotesi di danno relativo all’insuccesso della metodica, suggerendo criteri di valutazione.

Published
1988

47. Cephalometric evaluation of lower incisor position

Author

LAINO, ALBERTO, MICHELOTTI, AMBROSINA, RATTO, ANTONIO, Valletta R., Laino, Alberto, Michelotti, Ambrosina, Ratto, Antonio, and Valletta, R.

Abstract

The Authors examined some cephalometric values usually utilized to evaluate lower incisors inclination or anteroposterior position. Mean values and standard deviations of these parameters in a 194 subjects sample was calculated. Validity of these valued in different typology and skeletric classes was finally verified.

Published
1988

48. Morphological and structural S.E.M. analysis of a new type of orthodontic bracket

Author

Alberto Laino, Sangiovanni R, Albano F, Michelotti A, Valletta R, Laino, Alberto, R., Sangiovanni, F., Albano, Michelotti, Ambrosina, and Valletta, Rosa

Subjects
Hot Temperature, Orthodontic Appliances, Hardness, Microscopy, Electron, Scanning
Abstract

The SEM analysis, the metallographic analysis, the microhardness and the mechanic resistance before and after recycling treatment, are compared with the analysis made on a bracket earlier produced by the same firm.

Published
1988

49. [Humoral indicators of periodontal disease activity]

Author

Zarone F, Martuscelli R, vincenzo bruno, Valletta R, F., Zarone, Martuscelli, Ranieri, V., Bruno, and Valletta, Rosa

Subjects
Mouth, microbiology, Gingival Pocket, microbiology, Gingival Pocket, Bacterial Infections, Gingival Crevicular Fluid, diagnosis, Gingival Crevicular Fluid, Bacterial Infection, metabolism/microbiology, Saliva, microbiology, Periodontal Disease, Humans, Saliva, microbiology, Humans, Mouth, Periodontal Diseases
Published
1988

50. [Force systems for correction of lower molar inclination]

Author

Alberto Laino, Michelotti A, Ratto A, and Valletta R

Subjects
Adult, Dental Stress Analysis, Orthodontic Appliances, Tooth Movement Techniques, Humans, Molar
Abstract

The authors analyzed the uprighting movement and suggested forces system developing wished movements considering M/F ratio generated on brackets. The effects of these system on anchorage segment were evaluated. Use of concurrent or non-concurrent was analyzed in the light of their "cohernce" with treatment goals.

Published
1988

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