DARWIN Digitale Dissertationen German Version Strich

FU Berlin
Digitale Dissertation

Michael Sörgel :
Analysis of compoundstability between two unprecious-metal-alloys after usage differently surface-condition-technics and application differently composit-adhesives
Prüfung der Verbundfestigkeit zwischen zwei NEM-Legierungen nach Anwendung verschiedener Oberflächenkonditionierungsverfahren und Verwendung unterschiedlicher Kompositklebstoffe

 FU Logo

|Abstract| |Table of Contents| |More Information|

Abstract

In this thesis, detailed comparative investigations into the effect of different storage conditions and durations onto the stability and resistance of metal-plastics compounds derived from surface conditionings have been presented. Shear-off-techniques were utilized to test the firmness of the compounds. Clogged Wirobond ® C and Wiron ® NT metal plates of different sizes were employed as test specimen. The clogging was accomplished by Compolute ® or PANAVIA F ® adhesives. An intermediate silicate layer was spreaded using either the Rocatec technology or a blow torch (pyrolysis conditions). In order to scrutinize the effect of the oral environment on the compound firmness, samples were exposed to an artificial aging process. The quality of the fracture was determined by visual evaluation of the fractured surfaces, with the presence of plastics on the sheared surfaces being the decisive criterion. In the following, a summary of the results of the underlying studies is given. All compound combinations exhibited the required minimal firmness of 5 MPa according to the ISO supplement 10477. Compolute ® adhesive in combination with the Rocatec technology assured the highest values. However, pyrolytic conditionings gave varying results depending on the adhesive employed. Generally, Compolute ® was shown to afford higher firmness values than PANAVIA F ®. The lowest values were obtained for the alloy primer compound using PANAVIA F ®. Furthermore, it was unambiguously proven that the spreading of an additional silicate-based intermediate layer allows the preparation of a highly stable metal-plastics compound that exhibits excellent resistance to hydrolysis conditions. Upon artificial aging, the adhesive power of the investigated metal-plastics compounds decreased dramatically. Consistently, the fractured surfaces did not show any remaining plastics residues. The other fractures featured varying fracture qualities leaving behind crescent-shaped notches in the plastics surfaces. The deformation of the adhesive geometry prior to fracture might account for this observed demolition of the plastics. The application of pyrolytic conditioning with a modified blow torch constitutes a convenient means for the onsite manipulation by the dentist, since the observed adhesion values are coequal to those derived from coventional adhesion methodologies.

Table of Contents

Download the whole PhDthesis as a zip-tar file or as zip-File

For download in PDF format click the chapter title

0. Titelblatt und Inhaltsverzeichnis
1. Einleitung 9
2. Literaturübersicht 11
2.1. Entwicklung und Anwendung der Klebebrückentechnik 11
2.2. Das adhäsive Verbundsystem im oralen Milieu 16
2.3. Das Schmelz-Metall-Kunststoff-Verbundsystem 25
2.4. Oberflächenkonditionierung 30
2.5. Verbundsysteme auf Basis der Haftsilane 36
2.6. Haftfestigkeitsuntersuchungen 40
2.7. Faktoren, die den Metall-Kunststoff-Verbund beeinflussen 46
2.8. Prüfverfahren für den Verbund Metall - Kunststoff 47
3. Material und Methode 49
3.1. Material 49
3.2. Methode 57
4. Ergebnisse 60
4.1. Allgemeines 60
4.2. Einfluss unterschiedlicher Lagerungsbedingungen auf die Verbundfestigkeit zweier NEM-Legierungen nach Durchführung verschiedener Oberflächenkonditionierungsverfahren 60
4.3. Vergleich der Verbundfestigkeitswerte verschiedener Oberflächenkonditionierungsverfahren unter Berücksichtigung der Lagerungsart 78
4.4. Zusammenfassender Vergleich der Abscherfestigkeiten der untersuchten Verbundsysteme 90
5. Diskussion 92
5.1. Fragestellung 92
5.2. Diskussion und Messfehler 92
5.3. Die Verbundfestigkeitsprüfung 98
5.4. Diskussion der Messergebnisse 99
5.5. Diskussion des Verfahrens 106
6. Klinische Bedeutung 107
7. Zusammenfassung 109
7.1. Zusammenfassung 109
7.2. Summary 110
8. Literaturverzeichnis 112
9. Tabellenanhang 125

More Information:

Online available: http://www.diss.fu-berlin.de/2002/182/indexe.html
Language of PhDThesis: german
Keywords: Surface condition, metal plastics compound, adhesion compound, adhesive bridge, silicate layer
DNB-Sachgruppe: 33 Medizin
Date of disputation: 13-Sep-2002
PhDThesis from: Fachbereich Humanmedizin, Freie Universität Berlin
First Referee: PD Dr. rer. nat. Roland Strietzel
Second Referee: Prof. Dr. Georg Sauer
Contact (Author): m.soergel@berlin.de
Date created:06-Sep-2002
Date available:10-Sep-2002

 

|| DARWIN|| Digitale Dissertationen || Dissertation|| German Version|| FU Berlin|| Seitenanfang ||

Mail-Icon Fragen und Kommentare an:
darwin@inf.fu-berlin.de

© Freie Universität Berlin 1999