Dokument: Influence of straight versus angulated screw channel titanium bases on failure loads of two-piece ceramic and titanium implants restored with screw-retained monolithic crowns

Titel:Influence of straight versus angulated screw channel titanium bases on failure loads of two-piece ceramic and titanium implants restored with screw-retained monolithic crowns
URL für Lesezeichen:https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=70169
URN (NBN):urn:nbn:de:hbz:061-20250717-121211-7
Kollektion:Dissertationen
Sprache:Englisch
Dokumententyp:Wissenschaftliche Abschlussarbeiten » Dissertation
Medientyp:Text
Autor: Helal, Edriz [Autor]
Dateien:
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Dateien vom 14.07.2025 / geändert 14.07.2025
Beitragende: Gierthmühlen, Petra C. [Gutachter]
Prof.Dr. Wilmes, Benedict [Gutachter]
Dewey Dezimal-Klassifikation:600 Technik, Medizin, angewandte Wissenschaften » 610 Medizin und Gesundheit
Beschreibung:This dissertation investigates the influence of straight versus angled titanium bases on
the failure loads and bending moments of two-piece ceramic and titanium implants
restored with monolithic zirconia crowns. The objective of this study was to evaluate the
effect of abutment design on the stability of these implant systems following
thermomechanical loading. In the study, 32 monolithic screw-retained zirconia crowns
were categorized into four groups: two groups were mounted on titanium-zirconium
implants (Ti-Zr), and two groups were mounted on ceramic implants (CI). The implants
had identical dimensions (4.1 x 12 mm) but featured different abutments, which were
configured either as straight (Ti-Zr-0/CI-0) or angled (Ti-Zr-25/CI-25). All samples were
subjected to dynamic loading comprising 1.2 million cycles at 49 N and 1.6 Hz, as well
as thermal cycling across a temperature range of 5°C to 55°C. Following these stress
tests, the specimens were loaded to failure using a universal testing machine to calculate
bending moments. Fracture surface analysis was performed using light microscopy and
scanning electron microscopy (SEM) to determine the fracture characteristics. Statistical
evaluation was conducted using ANOVA and Mann-Whitney U-tests, with a significance
level set at p < 0.05. The results indicated that all samples endured the
thermomechanical loading without complications. The highest mean bending moments
were measured in angled abutments and ceramic implants, with the Ti-Zr-25 group
achieving 303 ± 86 Ncm, the CI-25 group 434 ± 71 Ncm, the Ti-Zr-0 group 241 ± 45
Ncm, and the CI-0 group 326 ± 58 Ncm. Angled abutments (p = 0.001) and ceramic
implants (p < 0.001) exhibited significantly greater stability compared to straight
abutments and titanium implants. While titanium implants showed only plastic
deformation under stress, twelve of the sixteen ceramic implants exhibited fracture. The
present findings suggest that angled titanium bases and ceramic implants exhibit higher
resistance to mechanical stresses under the tested parameters. This study provides
valuable insights for implantology, particularly regarding the selection of abutment design
and implant material. In this context, angled titanium abutments in combination with
ceramic implants could be recommended as a promising alternative to the gold standard
of titanium implants with straight abutments.
Lizenz:Creative Commons Lizenzvertrag
Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung 4.0 International Lizenz
Fachbereich / Einrichtung:Medizinische Fakultät
Dokument erstellt am:17.07.2025
Dateien geändert am:17.07.2025
Promotionsantrag am:24.02.2025
Datum der Promotion:10.07.2025
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