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Graded Ultra-Translucent Zirconia (5Y-PSZ) for Strength and Functionalities
L Mao1,2, M R Kaizer1, M Zhao1
11 Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
Journal of Dental Research
|April 26, 2018
Summary
Glass infiltration significantly enhances the strength of ultra-translucent zirconia (5Y-PSZ) dental materials, improving fracture resistance without compromising esthetics. This new material offers a promising solution for durable and visually appealing dental restorations.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Ceramics
Background:
- Ultra-translucent zirconias (5Y-PSZ) offer superior esthetics but suffer from reduced mechanical strength.
- The high cubic zirconia content in 5Y-PSZ limits transformation toughening, impacting durability.
- There is a need for advanced zirconia materials that combine high translucency with improved strength for dental applications.
Purpose of the Study:
- To enhance the flexural strength of ultra-translucent zirconia (5Y-PSZ) through surface glass infiltration.
- To evaluate the effect of glass infiltration on the esthetic properties (translucency) of 5Y-PSZ.
- To investigate the impact of clinical surface treatments (air abrasion, glazing, polishing) on the fracture resistance of glass-infiltrated 5Y-PSZ.
Main Methods:
- Surface glass infiltration was performed on ultra-translucent 5Y-PSZ specimens.
- Specimens were subjected to a 4-point bending test to measure flexural strength.
- Translucency was assessed using the translucency parameter (TP) and contrast ratio (CR).
- Surface treatments including air abrasion, glazing, and polishing were applied to evaluate their effects.
Main Results:
- Glass-infiltrated 5Y-PSZ exhibited a >70% increase in flexural strength (582 ± 20 MPa) compared to uninfiltrated 5Y-PSZ (324 ± 57 MPa).
- The strength of glass-infiltrated 5Y-PSZ was also >25% higher than highly polished 5Y-PSZ (467 ± 38 MPa).
- Glass infiltration did not negatively affect translucency (TP = 34, CR = 0.32) after residual glass removal.
- Air abrasion and glazing significantly decreased flexural strength (274 ± 55 MPa and 211 ± 21 MPa, respectively).
Conclusions:
- Surface glass infiltration is an effective method to significantly improve the strength of ultra-translucent 5Y-PSZ.
- Glass-infiltrated 5Y-PSZ maintains excellent translucency, making it suitable for esthetic dental restorations.
- Clinically relevant surface treatments like air abrasion and glazing can compromise the mechanical integrity of these materials.
Keywords:
air abrasion (sandblasting)estheticsflexural strengthglazinggraded zirconiasurface glass infiltrationMore Related Videos
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