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Strength Based on Science Drives Glidewell Dental Lab's BruxZir Solid Zirconia
Date:7/1/2010

ommunications. For the purposes of dental restorations, four physical properties exhibited by YSZ-based BruxZir Solid Zirconia make it ideal.

The first of these characteristics is strength. Typical zirconia exhibits a flexural strength of more than 1,200 MPa. However, BruxZir Solid Zirconia dental restorations are able to exceed that strength threshold, with flexural strengths up to 1,465 MPa.

Another benefit is high fracture toughness, also known as K1C value. To illustrate this concept, consider that a piece of lead or steel would have a high fracture toughness; glass or brittle materials have a low value. The fracture toughness for the YSZ used to fabricate BruxZir Solid Zirconia is three to six times higher than typical zirconia. This is the case because of a unique event known as phase transformation toughening that occurs in the material. The toughening mechanism comes into play when a crack is encountered. The cubic grains are constraining the tetragonal precipitates that want to expand and release associated energy. When these grains are faced with a crack tip, the tetragonal phase is released and allowed to change back to the more stable monoclinic phase. This results in volumetric expansion, effectively closing the crack and allowing a sort of self-healing to occur. This same property means BruxZir has excellent impact resistance.

In addition, this dental zirconia has excellent resistance to thermal shock. Low thermal expansion means that BruxZir will remain very stable in the mouth.

The fourth and most innovative property exhibited is color and translucency. Glidewell Dental Labs has recorded advancements that make it possible to change the opaque natural white hue of zirconia to a more desirable translucent natural ivory shade. The material scientists at the dental lab start with the most pure powders available and create better chemistry by refining particulates via size reduction and blending.


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