What Everest zirconia is
U&C International Co., Ltd. was founded in 2013 and has its head office and factory in Ansan-si, Gyeonggi-do, South Korea. The company sells its products under the UNC name, and the Everest line is its multilayer zirconia family. The current UNC product brochure lists several Everest discs; the two we work with are the 3D Multilayer AT and the 3D Multilayer PT. The disc labels print them as EVEREST W ML AT and EVEREST W ML PT, where ML stands for multilayer, AT for anterior and PT for posterior. UNC does not explain the W prefix in any document we have found, so we do not interpret it.
The U&C instructions for use (Rev.8, January 2025) classify both Everest and Razor as ISO 6872 Type II Class 5 zirconia ceramics, made for milling all-ceramic restorations for anterior and posterior teeth. The FDA 510(k) summary K191902 lists the components as zirconium, hafnium, yttrium, aluminium, silicon, iron and erbium oxides, but U&C does not publish the yttria content, so we do not label Everest as 3Y, 4Y or 5Y zirconia.
These are the U&C lines we work with:
| Line | Translucency (incisal to cervical) | Flexural strength |
|---|
| Everest 3D Multilayer AT | 48% / 48% / 46% / 46% | 800 / 800 / 1,100 / 1,100 MPa |
| Everest 3D Multilayer PT | 46% / 46% / 44% / 44% | 1,100 / 1,100 / 1,250 / 1,250 MPa |
| Razor 1300 (single layer) | 44% | 1,300 MPa |
Strength and translucency layer by layer
The brochure describes each Everest disc as four bands from the incisal edge to the cervical area, and both shade and material change across them. In the AT disc the two upper bands are the most translucent at 48% and the weakest at 800 MPa; the two lower bands drop to 46% and rise to 1,100 MPa. When we nest an anterior crown in the disc, the incisal third sits in the translucent bands and the cervical area and connectors sit in the stronger ones.
The PT disc follows the same pattern one step higher in strength. Its upper bands are 1,100 MPa at 46% translucency and its lower bands 1,250 MPa at 44%. In practice PT trades two points of translucency at each level for 300 MPa more at the incisal end and 150 MPa more at the cervical end, which is why U&C positions it for molars, long bridges and full-arch work rather than for front teeth.
The brochure does not state the test method behind these layer values. For comparison only: the FDA 510(k) summary K191902 reports a flexural strength of more than 500 MPa for Razor and Everest, a coefficient of thermal expansion of (10.3 ± 0.5) × 10⁻⁶/K and chemical solubility below 2,000 µg/cm², all stated as meeting ISO 6872. A minimum value from a regulatory file and a brochure value per layer are not the same kind of number and should not be compared directly. For the differences between zirconia generations, see 3Y-TZP vs 5Y-PSZ zirconia.
Indications: choosing AT or PT
U&C gives each disc its own indications in the brochure and on its product pages:
- Everest Multilayer AT: full-contour zirconia in the anterior region: veneers, anterior crowns and anterior bridges.
- Everest Multilayer PT: full-contour zirconia in the posterior region: posterior crowns, bridges including long-span bridges, and All-on-4 type full-arch restorations.
The instructions for use set a minimum wall thickness of about 0.6 mm before sintering and about 0.5 mm after sintering. If the scan shows too little room for that, our CAD team flags it at the design stage. For a case that crosses from the premolars into the anterior region, or a bridge where you are unsure which disc fits, we confirm the choice with you before milling.
Sintering, shades and disc sizes
The instructions for use give one recommended program for Everest and Razor: heat at 17 °C per minute to 1,000 °C (about one hour), at 10 °C per minute to 1,300 °C (30 minutes), at 7 °C per minute to 1,530 °C (30 minutes), hold for 120 minutes, then cool at 7 °C per minute over about four hours. The brochure calls this the normal mode, for cases below six units, at about eight hours in total. For the PT disc it adds a long-term mode for seven units or more, with an extra one-hour hold at 900 °C, taking about 11.5 hours. The program sets the final strength and translucency, so we do not shorten it.
- Shades: the 16 VITA classical shades for both discs. The brochure also lists bleach shades BL0 to BL3; the instructions for use name only BL1 and BL3 among the multilayer bleach shades, so per the IFU we treat BL1 and BL3 as the bleach options.
- Disc sizes: 95 mm and 98 mm diameter, 12, 14, 16, 18, 20, 22, 25 and 30 mm thick, for both AT and PT.
- Coloring: U&C also makes U&C Liquid, a water-based coloring liquid for individual staining before sintering, covered by the same 510(k).
If a shade or disc is not available for your case, we will tell you before production and agree the timing or an alternative.
Razor 1300: the single-layer option
Razor is U&C’s single-layer (monolayer) zirconia line, and Razor 1300 is its high-strength member. The brochure and the U&C product page give it a flexural strength of 1,300 MPa and a translucency of 44%, the same in every part of the disc because there are no layers. That is stronger than any band of Everest PT, with the same translucency as the PT cervical bands, and with one shade throughout instead of a gradient.
U&C lists Razor 1300 for posterior crowns, copings, coping bridges, posterior bridges, full-arch restorations and All-on-4. It comes in 17 shades (A0 plus the 16 VITA classical shades), as 95 mm or 98 mm discs from 12 to 30 mm thick. Sintering follows the same instructions for use as Everest: 1,530 °C with a two-hour hold, about eight hours in normal mode, with a long-term mode of about 11.5 hours for seven units or more.
Ordering Everest restorations from Khai Nguyen
Zirconia crowns and bridges take 2–4 working days in the lab; zirconia on implants takes 3–4.5 working days depending on the number of units. Overseas cases then ship by DHL, which usually takes 2–4 days. More on timing in Vietnam dental lab turnaround time and shipping.
With the case, please state:
- The restoration type and tooth numbers.
- The disc you want (Everest AT, Everest PT or Razor 1300), or let us choose.
- The VITA shade, the stump shade and shade photos if available.
- Your cementation protocol, so that we can set the cement space.
Restorations are covered by our general warranty (6 months to 15 years depending on the material). To compare with other zirconia, see Luxen, IPS e.max ZirCAD Prime, Ceramill Zolid and DMax Natura, or browse all the zirconia blanks we work with. To discuss a case, please contact Khai Nguyen or follow our ordering process.
Technical values come from the UNC product brochure, the U&C zirconia block instructions for use, U&C’s product pages and the FDA 510(k) summary K191902. This page is written for dentists and dental technicians. Khai Nguyen Dental Lab fabricates restorations only on professional prescription and does not sell directly to patients.
