Why Stain Matters on Zirconia
Full Arch zirconia present a unique finishing challenge: the gingival anatomy must replicate the subtle matte-to-satin sheen of natural gum tissue, while withstanding the mechanical demands of daily wear without surface degradation or color shift.
Unlike glazed porcelain or acrylic, zirconia cannot be surface-stained with conventional low-fusing products without risking adhesion failure. CGI Gum Stain Pastes are specifically formulated for zirconia surfaces — bonding at the correct sintering temperature range to deliver a durable, tissue-accurate finish.
Key Advantage
CGI Gum Stain Pastes fuse to the zirconia surface during a dedicated short-fire cycle, creating a mechanically bonded characterization layer that resists abrasion, staining, and delamination under clinical conditions.
The CGI Gum Stain Paste Range
The CGI system includes five base stain shades corresponding to natural gingival tissue tones — from light/young to deep/mature — plus three modifiers for localized tissue effects such as attached gingiva, stippling zones, and interdental papilla blush.
Blush
Light / Young
Pale pink. Ideal for young patients, light complexions, and areas of attached keratinized gingiva.
Orchid
Mid / Universal
Gum Stain 02
Standard mid-pink. The most commonly used base shade. Suitable for the majority of cases across skin tones.
pomegranate
Medium
Gum Stain 03
Deeper rose tone. Use for Mediterranean, South Asian, and Latin complexions with higher tissue pigmentation.
cranberry
Deep
Rich, deep tone. Suited to darker complexions and areas of natural melanin pigmentation in gingival tissue.
Guava
Modifier
Applied over the base shade to create the characteristic orange-peel stippling pattern of attached gingiva.
violet
Modifier
Gum Violet
Interdental papilla blush modifier. Adds vascular depth at the col area and interdental regions.
750° Firing Temperature
6 Satin Paste Shades
2× Fire Cycles Required
The goal is not to paint the gum — it is to recreate the optical depth and surface character of living tissue. That begins with surface preparation, not the paste.
CGI Dental Technical Advisory
Surface Preparation
Correct surface preparation is critical for paste adhesion. After sintering, the gingival surface of the zirconia denture should be evaluated under magnification for any remaining tool marks, sharp ridges, or surface contamination.
Before applying any CGI Gum Stain Paste, the gingival surface must be cleaned with 99% isopropyl alcohol and allowed to dry fully. Do not touch the cleaned surface with ungloved hands. Contamination with skin oils will cause paste delamination during firing.
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Important: Do not sandblast the gingival surface prior to CGI Gum Stain application. Aluminum oxide particle embedment will disrupt paste adhesion chemistry. If the surface requires adjustment post-sintering, use only fine diamond burs followed by thorough ultrasonic cleaning and alcohol wipe-down.
Step-by-Step Gum Stain Firing Workflow
1
Shade Selection & Mixing
Select the base Gum Stain shade that best matches the patient's gingival tissue from the intraoral reference photograph. Mix the paste on a glass slab using the supplied modelling liquid to a smooth, creamy consistency. The paste should flow freely from the brush without running.
2
Base Coat Application — First Fire
Apply a thin, even base coat over the entire gingival surface using a soft sable brush. Work in smooth, flowing strokes following the gingival contour. Avoid overloading — Allow the paste to dry completely in air (approximately 5 minutes) before placing in the furnace.
3
First Fire Cycle
Fire at 750°C with a 6-minute ramp from 350°C, 1-minute hold at peak, under full vacuum. Open at 450°C. Allow full bench cooling before evaluation. Do not quench.
4
Colour Evaluation & Correction
Evaluate the fired shade under natural daylight and D65 light. If the result is too light, mix a second application of the base shade or step up one shade (e.g., Blush to Orchid). If depth is adequate, proceed to modifier application. Correct localized areas with a fine brush before the second fire.
5
Stippling & Papilla Modifier Application
Using Cranberry, apply a stippled texture to the attached gingival zones using a dry, stiff brush in a dabbing motion — not a painting motion. For interdental papilla blush, apply diluted Violet at the col area with a fine-tipped brush, feathering the edges to avoid a hard line, very subtle as an accent color to barely characterize this area to mimic vascularization, too much of Violet will look unnatural
6
Second Fire Cycle — Final Stain Finish
Fire the second cycle at 745°C (5°C below first fire) with the same ramp and hold parameters. The slight reduction in peak temperature helps prevent the stain surface from over-glossing. Open at 450°C. The result should present a natural, tissue-accurate matte-to-satin surface that catches light at low angles.
7
Final Assessment & Polish Line
Inspect the denture tooth-to-gum junction under magnification. The transition between the white zirconia teeth and the gingival surface should appear clean and anatomically appropriate. If any paste has migrated onto the tooth surface, carefully remove with a fresh fine diamond point and re-fire if necessary.
Achieving Realistic Tissue Depth
Lifelike gingival aesthetics depend on light scattering at multiple depths, not just surface color. To build optical depth, apply the first fire in a lighter shade than the target, then deepen with a second application mixed two-thirds base shade to one-third Pomegranate or Cranberry. This creates a subtle subsurface warm tone visible under directional light — exactly as in natural tissue.
The papillary and rugae areas can be further defined by mixing a small quantity of Violet into the base shade and applying directly over those anatomical zones. This technique prevents the monotone, flat appearance that characterizes lower-quality denture characterization work.
Always use a reference photograph taken of the patient's natural gingiva under the same lighting conditions as your furnace room. Color memory is unreliable — photographs are objective.
CGI Gum Satin Pastes are compatible with all standard open-fire and vacuum-fire zirconia furnaces. However, calibrate your furnace against CGI's standard program at least once per month — drift of even 10°C will alter surface sheen and color saturation.
If the final surface appears too glossy, a light pass with a soft rubber polishing point at low RPM will reduce the gloss level without removing the characterization layer. Never use abrasive polishing compounds on the gingival surface post-characterization.
Store unused CGI Gum Stain Paste in a sealed container away from direct light. Exposure to UV will cause premature color shift in the paste and inconsistent results after firing.
For maximum tissue realism, thin the paste at the free gingival margin edges to translucency — this prevents the characterization layer from appearing as a thick, opaque coating at the most visible tissue edge.
Quality Control & Delivery
Before dispatching, inspect the finished denture under three light sources: overhead cool white, warm incandescent, and natural daylight. All three should present a consistent, pleasing gingival color without significant metamerism between the paste shades.
Document the shade combination, fire cycle parameters, and number of coats on the laboratory prescription card. This record ensures consistent results for future additions, repairs, or duplicate prostheses for the same patient.
