Overview
CrystalCeram® Zirconia Porcelain is a dedicated layering ceramic system engineered specifically for application over zirconia and lithium silicate frameworks. Unlike PFM porcelains — which require high-fusing temperatures of 900–960°C to bond to metal — CrystalCeram® Zirconia powders fire at significantly lower temperatures matched to the thermal expansion coefficient of modern zirconia and lithium silicate, preventing stress fractures and delamination.
The complete CrystalCeram® system spans gum porcelains, dentine body shades, dentine modifiers, standard enamels, internal modifiers, and opal enamels, providing everything required to achieve full anatomical characterization from the gingival margin through to the incisal edge.
Critical Distinction
CrystalCeram® Zirconia Porcelains must never be substituted with PFM or aluminous porcelains on zirconia substrates. The thermal expansion coefficients and firing ranges are incompatible — the result is chipping, crazing, or catastrophic delamination under occlusal load.
Complete CrystalCeram® Zirconia Product Range
The full range covers five functional categories. Each plays a distinct role in the layering sequence — gum porcelains for tissue simulation, dentine shades for the body of the tooth, modifiers for internal characterization, enamels for translucency and depth, and opal enamels for incisal effects.
GUM X-LIGHT GUM LIGHT GUM MEDIUM GUM DARK GUM RED
DENTINE A1 DENTINE A2 DENTINE A3 DENTINE A3.5 DENTINE B1 DENTINE B2 DENTINE B3 DENTINE BL1 DENTINE BL4 DENTINE C1 DENTINE C2 DENTINE C3 DENTINE D2
MODIFIER BROWN MODIFIER GRAY MODIFIER ORANGE MODIFIER PINK MODIFIER YELLOW
ENAMEL BLUE ENAMEL CLEAR ENAMEL EXTRA LIGHT ENAMEL LIGHT ENAMEL TRANSLUCENT ENAMEL VIOLET
INT. MODIFIER BROWN INT. MODIFIER OCHER INT. MODIFIER ORANGE INT. MODIFIER PINK INT. MODIFIER YELLOW
OPAL ENAMEL BLUE OPAL ENAMEL CLEAR OPAL ENAMEL GRAY OPAL ENAMEL TRANSLUCENT
34+ Total Products in Range
13 Dentine Body Shades
825°C Peak Firing Temperature
Z-LiSi Zirconia-Lithium Silicates
Correct Zirconia Firing Cycles
CrystalCeram® Zirconia Porcelains fire at temperatures between 820°C and 8250°C — well below PFM ranges. These lower temperatures are essential: zirconia has a lower thermal expansion coefficient than metal alloys, and excess heat causes residual stress, resulting in chipping or fracture of the veneering ceramic during service.
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Never use PFM firing programs for CrystalCeram® Zirconia powders. PFM programs typically run at 900–960°C — more than 80°C above the correct zirconia range. This will cause the veneering ceramic to over-fuse, collapse, and permanently discolour.
| Firing Stage full arches |
Start Temp |
Ramp Rate |
High Temp |
Hold |
Vacuum |
| Pre-dry / Burn-out |
RT |
35°C / min |
650°C |
2 min |
None |
| Internal Modifiers Build Fire |
500°C |
35°C / min |
825°C |
1 min |
500°C – 825°C |
| Dentin Build Fire |
500°C |
35°C / min |
825°C |
1 min |
500°C – 820°C |
| Enamel / Opal Fire |
500°C |
35°C / min |
820°C |
1 min |
500°C – 820°C |
| CGI Stain & Glaze |
500°C |
35°C / min |
725°C/750°C |
1 min |
None (open fire) |
Its very important to Make sure the cooling for full arches is at least 15 minutes and all the way to 450°C to avoid any fractures due to fast cooling
Furnace Calibration
Calibrate your furnace against a CrystalCeram® test button monthly. A correctly fired Dentine A2 button should present a smooth, semi-matte surface with no pinholes, blistering, or colour shift toward yellow. Drift of 10°C above peak will produce over-glossing; drift below will leave underfired surface texture.
The most common error in zirconia layering is applying PFM habits to a zirconia system. Lower temperatures, slower ramps, and thinner layers — this is the mindset shift that separates consistent results from constant chipping.
Crystalceram Technical Advisory
Shade Selection
Select the dentine shade under standardized D65 or natural daylight. CrystalCeram® Dentine shades correspond directly to Vita Classical (A1–D4) and Vita Bleach (BL1, BL4) designations. Record hue, chroma, and value independently — never rely on a single shade tab match, particularly under operatory lighting which skews toward yellow.
For gum characterization, assess the patient's gingival tissue colour in the unwashed state under natural light and match to the Zirconia Porcelain Gum range (X-Light through Red). Most Caucasian patients fall in the Light to Medium range; darker complexions typically require Medium to Dark, with Red used only for localised vascular or hyperaemic areas.
Complete Zirconia Layering Workflow — Step by Step
1
Framework Inspection & Preparation
Confirm the sintered zirconia coping or framework fits the model accurately with no marginal discrepancies. Clean with 99% isopropyl alcohol and allow to dry completely. Do not sandblast the bonding surface with Al₂O₃ above 50μm — excessive blasting embeds particles that disrupt ceramic adhesion. A light 25μm blast at 1.5 bar for 5 seconds is sufficient if surface roughening is required.
2
Internal Modifier Application (Optional)
For cases requiring internal effects — warm DEJ simulation, fluorescence, or grey chroma correction — mix the appropriate CrystalCeram® Zirconia Internal Modifier (Brown, Ocher, Orange, Pink, or Yellow) with modelling liquid to a thin wash consistency. Apply in a very thin layer directly to the zirconia surface. Internal modifiers are designed to fire before the dentine build — they are not for mixing into dentine powder.
3
Dentine Core Build
Mix the selected CrystalCeram® Zirconia Dentine powder with modelling liquid to a creamy, workable consistency. Build the dentine core anatomically in a single wet build, aiming for approximately 65% of final crown volume. Condense thoroughly with a vibrating instrument to remove air pockets. Taper the dentine toward the incisal and buccal surface to allow room for enamel and translucent layers. Over-build by approximately 15–20% to account for firing shrinkage.
4
Dentine Modifier Blending (Optional)
To deepen the cervical chroma or add characterisation within the dentine body, blend a small quantity of Zirconia Dentine Modifier (Brown, Gray, Orange, Pink, or Yellow) into the cervical third of the dentine build. Use modifiers sparingly — no more than 5–10% of the dentine powder weight. Too much modifier will oversaturate and appear unnatural after firing.
5
Dentine Fire — 825°C
Pre-dry the build on a muffle tray at the furnace entrance (at least 5 minutes) before inserting. Fire: start 500°C, ramp 35°C/min, vacuum on at 500°C, vacuum off at 825°C, peak 825°C, hold 1 minute, open at 4500°C. Allow full bench cooling — Evaluate shade, contour, and surface before proceeding.
6
Correction Wash (If Required)
If contour corrections or shade adjustments are needed post-dentine fire, apply a wash of the same dentine powder in problem areas and re-fire at 820°C (5°C below the initial dentine fire). Multiple correction fires are acceptable, but each subsequent fire should be reduced by 5°C to prevent over-densification of the ceramic surface.
7
Enamel & Opal Enamel Layering
Apply CrystalCeram® Zirconia Enamel (Clear, Extra Light, Light, or Translucent) over the full facial surface in a continuous wet build. For incisal translucency and optical depth, blend into Zirconia Opal Enamel (Blue, Clear, or Gray) toward the incisal third — allowing the two layers to merge without a defined boundary. Apply Enamel Blue or Enamel Violet sparingly at the incisal edge for cool, youthful optical effects. Over-build slightly to account for enamel shrinkage.
8
Enamel Fire — 820°C
Fire: start 500°C, ramp 35°C/min, vacuum on at 500°C, vacuum off at 820°C, peak 820°C, hold 1 minute, open at 450°C. Full bench cool. The enamel surface should present a slightly matte, translucent character at bisque — do not confuse this with an underfired result. This is correct pre-glaze appearance.
9
CGI Stain Application
Apply CGI Stains to the bisque surface using a fine sable brush. CGI stains are low-fusing characterization colours compatible with zirconia layering systems at the glaze firing temperature. Apply in thin layers — multiple passes are better than one heavy application. Focus surface staining on: incisal characterization (white/grey streaks), cervical chroma enhancement (brown/orange), and contact point definition. Allow each color to dry before the next.
10
Glaze Fire — 770°C (Open Fire)
Apply glaze paste in a thin, even coat over the complete surface. Fire at 770°C with no vacuum (open atmosphere), ramp 35°C/min from 500°C, hold 1.5 minutes at peak, open at 450°C. The resulting surface should show a natural, high-luster glaze. For a satin finish, allow the piece to cool fully and polish with a soft rubber point at low speed. Never polish aggressively over stain areas.
Using CGI Stains with CrystalCeram®
CGI Stains are designed as surface and glaze-fire characterization materials, compatible with the CrystalCeram® Zirconia firing range. They are applied after the final enamel fire, before or mixed into the glaze application.
For deep internal characterization — such as hypocalcification spots, craze lines, or fluorescent effects — use the CrystalCeram® Zirconia Internal Modifiers at the pre-dentine stage, not CGI surface stains. Internal modifiers are fired ceramic materials that tolerate the full dentine fire temperature; CGI stains are low-fusing and not suited for internal use.
Recommended CGI Stain Combinations
Natural Incisal Characterization
Apply CGI White thinly at incisal halo and mamelons. Use CGI Blue-Gray at the very edge for cool translucency. Blend CGI Orange at the cervical for warm dentin exposure. All applied over the bisque surface before glaze fire at 770°C.
Aged / High-Value Restorations
Use CGI Brown thinly at cervical margin. CGI Yellow over the mid-body for chroma depth. CGI Gray selectively for contact wear facets. .
Always pre-dry CrystalCeram® Zirconia powders for a minimum of 6 minutes at the furnace mouth before inserting. Moisture in the build causes surface blistering and is one of the most common causes of failed zirconia layering.
Each successive fire on a zirconia restoration should reduce peak temperature by 5°C. If you fire dentine at 825°C, fire the enamel at 820°C and the glaze at 770°C. This prevents over-densification and progressive gloss build-up.
CrystalCeram® Zirconia Enamel Violet and Enamel Blue are high-impact materials — a very small amount produces a strong optical effect. Test on a fired button before applying to a restoration. Excess blue or violet reads as artificial under incandescent light.
For BL1 and BL4 dentine shades (high-value bleach cases), use Enamel Extra Light or Enamel Clear as the overlying enamel — standard Enamel Light will read as too warm against bleach dentines and reduce perceived value.
CGI Stains should be stored in a cool, dark environment away from UV exposure. Shake or stir before use — settled stain paste fires inconsistently and produces patchy surface colour.
Document every case: shade selected, dentine modifier used (if any), enamel type, stain colours applied, and all firing temperatures. This record is essential for matched restorations, repairs, and future additions on the same patient.
Quality Checks & Delivery
Before dispatch, evaluate the completed restoration under three light sources: cool white LED, warm incandescent, and natural daylight. Shade consistency across all three confirms no problematic metamerism. Check the marginal integrity under 10× magnification — chipping at the porcelain-to-zirconia interface indicates an adhesion issue at firing or excessive thickness at the margin.
Confirm all occlusal contacts in centric and lateral excursion on the articulator. Any contact on veneering ceramic rather than polished zirconia should be adjusted and re-glazed before delivery.
