Effect of thermocycling on bond strength of luting cements to zirconia ceramic
| Autor: | Heinz Lüthy, Olivier Loeffel, Christoph H. F. Hämmerle |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Boron Compounds
Ceramics Time Factors Materials science Surface Properties Tetragonal zirconia polycrystals Dental Cements Dental bonding Phosphates Zirconia ceramic Materials Testing Shear strength Humans Methylmethacrylates General Materials Science Cubic zirconia Ceramic Composite material General Dentistry Crystallography Polycarboxylate Cement Bond strength Dental Bonding Silicon Dioxide Stainless Steel Resin Cements Glass Ionomer Cements Mechanics of Materials visual_art visual_art.visual_art_medium Methacrylates Thermodynamics Stress Mechanical Zirconium Adhesive Zinc Oxide Magnesium Oxide Shear Strength Dental Alloys |
| Zdroj: | Dental Materials. 22:195-200 |
| ISSN: | 0109-5641 |
| Popis: | Summary Objectives The aim of this study was to evaluate the shear bond strength of different cements to densely sintered zirconia ceramic after aging by thermocycling. Methods The following luting cements for bonding ZrO 2 -TZP (tetragonal zirconia polycrystals) were used in this study: Ketac-Cem, Nexus, Rely X Unicem, Superbond C&B, Panavia F, and Panavia 21. Groups of 30 test specimens were prepared by bonding stainless steel cylinders tribochemically silica-coated with the Rocatec-system to sandblasted ZrO 2 -TZP ceramic disks (cercon smart ceramics). Prior to testing all bonded specimens were stored in distilled water (37 °C) for 48 h and half of them ( n =15) were additionally aged by thermocycling (10,000 times). Results None of the fractures occurred at the interface of the metallic rods. The assemblies failed either at the interface between the ceramic surface and the cements or within the cements. Thermocycling affected the bond strength of all luting cements studied except for both Panavia materials and Rely X Unicem. Significance Within the limits of this in vitro study the results showed that—after thermocycling—bond strengths for Ketac-Cem and Nexus were quite low. Nexus in combination with tribochemical silica-coating of ceramic surface produced a higher bond strength. The four adhesive resin cements (Rely X Unicem, Superbond C&B, Panavia F, and Panavia 21) gave superior results. The strongest bond to zirconia was obtained with Panavia 21. |
| Databáze: | OpenAIRE |
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