SEM observations of porcelain Y-TZP interface
Michael J Tholey1, Michael V Swain, Norbert Thiel
1Research and Development Department VITA Zahnfabrik, Bad Saeckingen, Germany.
Summary
The stability of yttria tetragonal zirconia polycrystalline (Y-TZP) ceramics in dental restorations is investigated. Some Y-TZP interfaces show destabilization, indicating porcelain wetting and Y-TZP dissolution, impacting long-term adhesion.
Area of Science:
- Biomaterials Science
- Materials Science
- Dental Ceramics
Background:
- The metastability of the tetragonal phase in yttria tetragonal zirconia polycrystalline (Y-TZP) ceramics poses challenges for dental crown and bridge applications.
- Understanding the Y-TZP and veneering porcelain interface is crucial for long-term restoration stability.
Purpose of the Study:
- To investigate the nature of the interface between veneering porcelain and Y-TZP frameworks.
- To determine if preparation procedures and reactions affect zirconia stability at the interface.
Main Methods:
- High-resolution scanning electron microscopy (SEM) was used to examine polished and etched cross-sections of the interface.
- Y-TZP substrates were overlaid with both dry and moist veneering porcelain powders.
Main Results:
- Zirconia grains at the interface exhibited varied subgrain faceting, with some instances showing destabilization of the tetragonal phase.
- Evidence of porcelain wetting and partial dissolution of the Y-TZP material at the interface was observed.
Conclusions:
- The observed destabilization and dissolution at the Y-TZP interface are relevant to long-term adhesion of veneering porcelain.
- Potential for tetragonal to monoclinic phase transformations at the interface is discussed in relation to restoration longevity.
Related Concept Videos
01:11Glassware Calibration
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
01:06Interfacial Electrochemical Methods: Overview
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
01:18Porosity in Cement Paste
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
The balance of water to cement in the mix is critical—it...