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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 66 (1998), S. S805 
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 24 (1997), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary The aim of the present study was to compressive and diametral tensile strength, evaluate the clinically relevant properties of the compressive strength and marginal fit of full crowns. recently introduced ceramic material IPS Empress™, The results show that this material is a highly which is marketed for all-ceramic restorations. The developed glass-ceramic with physical properties following parameters were investigated: three- and making this dental material well suitable for four-point bending strength, bi-axial flexure strength, adhesively luted restorations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 547-553 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Surface analytical methods such as scanning electron microscopy (SEM), scanning force microscopy (SFM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) were used to study the surface properties of amalgam substitutes as tooth filling materials. In particular the corrosion resistance of new gallium restorative materials was determined. To give relevant practical data, the measurements were performed before and after storing the alloys in artificial saliva to simulate physiological oral conditions. Subsequently an analysis of the artificial saliva was carried out with atomic emission spectroscopy with inductively coupled plasma (ICP-AES). Selective corrosion of different phases and a high gallium release could be determined.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 64-66 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Surface analytical methods such as scanning electron microscopy (SEM), electron dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) were used to study the surface properties of several noble metal casting alloys which are used as core materials for fixed prosthodontics. In particular surface morphology, surface segregation, and oxide formation were studied as the key parameters influencing the adhesion properties between alloy and ceramic veneer.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 471-476 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of Ga content on the corrosion resistance of NiCr20Mo 10Ga dental alloysThe influence of different gallium contents on the corrosion behavior of Ni-Cr alloys exposed to 0.1 M lactic acid, 0.1 M sodium chloride, 0.005 M potassium thiocyanate has been studied. Five experimental NiCr20Mo 10Ga alloys differing in their gallium contents (0, 5, 7, 10, 15 wt.%) were described by potentiodynamic polarization as well as by analytically determined substance loss measurements. The results revealed that gallium contents up to 10 wt.% improve the corrosion characteristic whereas higher amounts of this very element decrease the corrosion resistance drastically.
    Notes: An fünf experimentellen NiCr20Mo 10Ga Legierungen mit Ga-Gehalten von 0, 5, 7, 10 und 15 Massen-% wurde der Einfluß von Ga auf das Korrosionsverhalten in einer Lösung aus 0,1 M Milchsäure, 0,1 M Natriumchlorid und 0,005 M Kaliumthiocyanat untersucht. Als Untersuchungsmethoden dienten elektrochemische Messungen zur Bestimmung von ECORR, EP, iCORR, RP und analytische Messungen zur Bestimmung der Ionenabgabe. Die Ergebnisse zeigten übereinstimmend, daß die Korrosionsbeständigkeit von NiCr20Mo 10Ga erst ab Ga-Gehalten von über 10 Massen-% verschlechtert wird.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary High-grade dental steel, such as is commonly used for banding and bracketing in orthodontics, consists of up to 20% chromium and more than 10% nickel by weight. As an essential trace element chromium is less likely to produce toxic or allergic side-effects than nickel, a metal which has attracted attention in dermatology, industrial medicine and dentistry on account of its allergic potential. Preliminary microscope examination revealed corrosion phenomena related to the period of appliance wear. Saliva specimens before and during orthodontic treatment were examined for nickel and chromium utilising electrothermal atomic absorption spectrometry in order to clarify the extent of additional oral metallic exposure from fixed appliances. These results are examined against the background of case histories simultaneously conducted on 472 of our orthodontic patients, as well as the relevant literature.
    Abstract: Résumé L'acier spécial dentaire utilisé communément pour faire des bagues et des brackets en orthodonie, contient du chrome jusqu'à 20% et du nickel à plus de 10%. Comme oligo-élément essentiel, le chrome est moins soupçonné de produire des réactions secondaires que le nickel, métal qui retient l'attention particulière de la dermatologie, de la médecine du travail et de l'odontologie à cause de son potentiel allergique. Comme un premier examen microscopique a pu révéler des effects corrosifs en fonction de la durée de l'application des appareillages, des prélèvements de salive avant et pendant le traitement orthodontique ont été analysés pour déceler des oligo-éléments par la spectrométrie d'absorption atomatique électrothermale, afin de clarifier la mesure d'une exposition orale supplémentaire au métal due à l'emploi d'appareillages fixes. En vue de connaître l'importance clinique de l'exposition orale supplémentaire due aux apparaillages, on a analysé les résultats d'une enquète sur les allergies, basée simultanément sur les anamnèses de 472 de nos patients orthodontiques et de la littérature relative à ce sujet.
    Notes: Zusammenfassung Chrom ist bis zu 20, Nickel zu mehr als 10 Gewichtsprozenten Bestandteil von Dentaledelstahl, wie er in der Kieferorthopädie für Bracket-und Bandmaterial verwendet wird. Chrom ist als essentielles Spurenelement toxikologische wie allergologisch weniger suspekt als Nickel, dem in Zahnheilkunde, Dermatologie und Arbeitsmedizin viel Aufmerksamkeit zukommt wegen der Auslösung von Kontaktstomatitiden und-dermatitiden. Da in einer ersten Untersuchung von der Tragezeit abhängige Korrosionserscheinungen mikroskopisch sichtbar gemacht werden konnten, wurden zur Klärung des Ausmaßes einer zusätzlichen oralen Metallexposition durch festsitzende kieferorthopädischen Behandlungsgeräte Speichelproben von Patienten vor Beginn und während kieferorthopädischer Behandlung auf Chrom und Nickel mit der elektrothermalen Atomabsorptionsspektrometrie spurenanalytisch untersucht. Die Resultate werden hinsichtlich der klinischen Bedeutung einer auf kieferorthopädische Behandlungsgeräte zurückzuführenden zusätzlichen oralen Exposition vor dem Hintergrund der Ergebnisse einer gleichzeitig von uns durchgeführten Allergieanamneseerhebung bei 472 unserer kieferorthopädischen Patienten und der einschlägigen Literatur diskutiert.
    Type of Medium: Electronic Resource
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