The Benefits of 3D Pro Multi-layer Zirconia
There are totally 5 layers whereas the dividing line is more invisible and fuzzy, the color distribution is more even so they somewhat resemble the color of natural teeth,
3D Pro multilayer zirconia is durable due to 650~1200MPa strength which is enough to withstand chewing forces. 3D Pro multilayer zirconia is totally biocompatible – it won’t cause any adverse reactions in your body.
If you have a tooth that is wearing down, cracked, or chipped, and you’re trying to decide if zirconia is the right material for your crown, your dental professional will best be able to advise you. Hopefully, with this newfound knowledge, you can have an informed conversation with your dentist about your specific needs, like the location of tooth damage in your mouth, the function of that tooth, the cost, and the aesthetic you hope to achieve. Then, together, you will be able to decide on a crown material that will give you a big toothy grin.
Dental zirconia is a kind of CAD/CAM matierlas, CAD/CAM manufactured 3D Pro multi-layer zirconia restorations have a superior translucency hence their increased reputation. As its popularity continues to rise there are some worries regarding the monolithic or full-contour zirconia in dental applications, such as the matching color to the other teeth, durable and long-term chemical stability, clinical wear behavior, the surface porosity, The one-piece zirconia restorations may be reliable clinical solution especially in the molar areas with big occlusal forces. They exclude the complication of veneering material chipping and offer good biological and mechanical properties and on the other hand in the presence of a reduced prosthetic space seem that the one material restoration have the first clinical option.
It is important to assess the wear behavior of monolithic zirconia restorations, but of a bigger clinical importance is the wear of the enamel of natural antagonists teeth opposed to the zirconia material
Progressive wear of teeth is a normal manifestation in the human dentition. Many factors contribute to the dental wear such as food, bruxism, the oral muscles forces, enamel thickness and hardness, pH and nature of the saliva and the dental materials. All these factors have different wear behaviors which modify the wear process as well. The physiological wear is altered when we use restorative materials with different wear rates.
A small amount of studies has tried to explain the influence of zirconia ceramic directly on enamel wear. From the in vitro studies we have reached the conclusion that there seems to be an agreement that polished full zirconia crowns have the lowest mean weight loss values of the antagonistic human enamel and this strongly related to its very smooth surface that increases its biologic compatibility and lowers its abrasiveness and results in a decreased level of antagonistic wear than other ceramics. After glazing and polishing and one final glazing zirconia presented important opposing enamel wear, and while the veneering ceramic exhibit even more important wear on the antagonist. However further clinical studies are required to support the results of the in vitro testing.
Studies conducted zirconia as an ageing process of zirconia, referring to the surface degradation with the grain pullout and a subsequently micro cracking of the structure mainly due to the presence of water.
Usually, we begin at the surface of polycrystalline zirconia and then it will develop within the depth of the material. The transformation of one grain is followed by an expansion in volume and will lead to micro-cracking and modifications to the other grains. This process of surface degradation is emphasized by the penetration of water and this transformation progresses from one grain to the next one. This progression of the conversion zone determines severe micro-cracking, grain pullout and, in the end, surface roughening, which finally determine a lower strength of the entire piece. Any factor like the grain size, the stabilizer quantity or the residual stresses may be disadvantageous to the stability of tetragonal zirconia and a certain degradation degree may occur at low temperatures.
It’s reported that a slow t→m transformation from the metastable tetragonal phase to a more stable monoclinic phase can happen when the humidity raises even with low temperatures and leads to potential micro-cracking and decreasing strength of zirconia.