First of all, repair material selection mainly depends on the abutment condition, occlusal condition and patients’ intention.
Then here comes the difference between the two materials.
The main components of Emax is Lithium disilicate. It’s produced by hot-pressure casting. Simply speaking, through heating sintering and pressurization a chemical reaction is produced. The material has a glassy state after sintering. So it has a pretty good translucency. But disadvantage is also its translucency. It is not a good choice for teeth discoloration. Emax is too translucent to block the discolored teeth part. It will get a bad effect. Meanwhile, at least 1mm in thickness is required for all-ceramic crown, so emax cannot be used if occlusal room is little, or else restorations may be cracked.
Main components of zirconia material is zirconium dioxide. As the melting point is high, it is produced in the way of block-milling. Though emax can also be used for block-milling, its strength is far lower than that of zirconia.
Advantage of zirconia is high strength (over 600mpa). thus with little occlusal space, zirconia crown can be reduced too thin to fit in. Seldom teeth crack may occur. In addition, it has a strong masking effect, it can work for discolored teeth.
But for most of zirconia materials over the market, the two problems are obvious: when high strength and strong masking effect, its translucency may come worse. How to solve it?
The newest launched product: Aidite Multilayer 3D dental zirconia block
6 layers of strength transition from 600 mpa and 900mpa
Cervical part is 900mpa, to keep it stable and have a strong masking effect;
Incisal part is 600 mpa, to ensure its translucency from 43% to 57%. its translucency is also 6 layers of color transition, like natural teeth. Strength is high enough for anterior or posterior teeth and bridges.
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