Zirconia (zirconium dioxide) crowns are made of solid monolithic zirconia ceramic material. Although discovered in 1789 by the German chemist Martin Heinrich Klaproth, zirconia has been used as a biomaterial since the late 1960s. Its use as a dental restorative material became popular in the early 2000s with the advent of CAD-CAM technology. In the later part of the decade they became available as preformed crowns for primary teeth.Send InquiryChat Now
China products milling veneer teeth cad cam sirona zirconia block
(1). Our chongqing company has found in 2009, we are the earliest and best professional manufacture of dental zirconia ceramic blocks, could compatible all kinds of manual and CAD/CAM systems;
(2). For our zirconia blocks, now we have white blank preshaded block & Multilayer zirconia for you choice:
HT---high translucency, suitable for making normal copings and frameworks;
Pre-Shaded blocks---Now A1 A2 A3 colored blocks are available; and also researching the 16 colored blocks;
STM is multilayer block.Strength from top to bottom is 600-900MPA,translucency is 44%–55%;
In the spirit of responsibility for the customer, our company keeps tight follow-up with product quality, visits our customers periodically, adopts the suggestions from our customers, and offers the all-day, all-directional and top-grade market services.
The technical and after-sale services are listed as follows:
1. Our company will provide services by phone, Whatsapp, Skype, e-mail, etc., please refer to the contact details.
2. Our company will implement the contract strictly; deliver the products to location specified by our customers in accordance with the mode of transportation.
3. 24-hour hot line. Once receive the customer complaints, we will response within 24 hours at working time and provide solution within 48 hours.
4. Free return or replacement will be provided if defects result from quality failure of our product.
Q: Are there differences among zirconia ceramics?
A: Differences among zirconia ceramics can occur with the level of purity of zirconia; grain size, trace elements and stabilizing compounds; and consistency of formulation. Differences can exist in shrinkage from batch to batch because of differences in the coefficient of thermal expansion (CTE).
Q: Zirconia substructures have high flexural strength, 900-1200 MPa, but what is the flexural strength of the zirconia/porcelain system?
A: Flexural strength is typically performed on a three-point bend specimen and is a function of relative thickness of the zirconia and overlaid ceramic, but it would not exceed the flexural strength of the zirconia.
Q: Does zirconia ceramic degrade in strength intraorally in 5-10 years?
A: Yes, all-ceramic materials degrade in strength over time - some more than others. Zirconia ceramic has an initial flexural strength of over 1200 MPa, so even if it degrades 5-10% or more, it is still significantly stronger than other ceramics.
Q: Is the fit of crowns and bridges based on zirconia copings as good as that of PFM crowns and bridges?
A: Yes, the marginal fit of crowns and bridges fabricated from zirconia copings can be as good or better than PFM crowns and bridges.
Q: Is the fit of a zirconia coping important since the zirconia ceramic is so strong?
A: The thicker the cement the weaker the all-ceramic restoration. Cements are not as rigid as zirconia ceramic, so a thicker cement layer will cause more flexural deformation of a ceramic core, increasing the potential for fracture.
Q: Is it ok to grind on a zirconia coping without water spray?
A: Water spray is necessary when grinding on a zirconia ceramic coping. The white light or hot spot you see between a diamond and a zirconia ceramic has been measured at 1500 ºC. If the temperature of zirconia ceramic rises above 1000 ºC, a phase change can occur that will induce cracking and surface defects, lowering the strength of the coping.