ST Multilayer Zirconia Disc(98mm) - Gradient Shade Dental Block

Milling & Processing Workflow:

Step 1: CAD Design & Milling (30-45 minutes)

• Design restoration with 20-25% enlargement to compensate for sintering shrinkage
• CRITICAL: Orient restoration correctly - ensure gradient flows from cervical (bottom/darker) to incisal (top/translucent)
• Use wet milling for optimal results and minimal tool wear
• Recommended bur: 1.0-2.0mm diameter carbide or diamond burs
• Milling speed: 20,000-40,000 RPM
• Feed rate: Moderate (adjust based on detail complexity)
• Mill in pre-sintered state (multi-layer gradient, porous material)

Step 2: Sintering (8-10 hours) – NO STAINING NEEDED

• Place milled restoration directly in the sintering furnace (skip staining step)
• Follow the recommended sintering cycle (see table above)
• During sintering, the pre-integrated gradient becomes fully developed and fixed
• Material shrinks 20-25% and becomes fully dense and strong (1200 MPa)
• Ensure proper support to prevent warping
• Allow complete cooling before handling

Step 3: Glazing (Optional) & Cementation

• Optional: Apply glaze for enhanced surface finish (fire at 800-900°C)
• Optional: Apply surface stains for fine characterization if needed
• Check fit and make minor adjustments if needed
• Clean thoroughly before cementation
• Use resin-modified glass ionomer or resin cement
• Consider airborne particle abrasion for improved bond strength

🎨 Gradient Orientation is Critical: Always ensure the restoration is oriented correctly during milling. The gradient should flow from cervical (darker, less translucent) to incisal (lighter, more translucent) to achieve natural-looking results. Incorrect orientation will result in reversed esthetics.

Why Choose ST Multilayer Zirconia?

The ST Multilayer Zirconia is developed for cases requiring superior anterior esthetics. The multi-layer gradient structure provides:

• Natural Tooth Mimicry: 4-layer gradient replicates the natural color and translucency transition of real teeth
• Time Savings: Eliminate manual staining and layering (save 20-30 minutes per case)
• Consistent Results: Factory-controlled gradient ensures predictable, batch-to-batch esthetic outcomes
• Seamless Integration: Natural gradient creates restorations that blend perfectly with adjacent teeth
• Simplified Workflow: No need for complex staining techniques or porcelain layering
• Reliable Strength: 1200 MPa strength suitable for both anterior and posterior applications

ST Multilayer vs ST White vs ST Pre-shaded

Recommendation: Choose ST Multilayer for anterior cases requiring maximum esthetics with a natural gradient. Choose ST Pre-shaded for efficient production with uniform color. Choose ST White for custom shade control.

Designed for Dental Laboratories

OnePro Dental works directly with dental laboratories worldwide, providing reliable CAD/CAM materials that combine performance, consistency, and cost efficiency.

The ST Multilayer Zirconia Disc is an excellent choice for labs seeking superior anterior esthetics with natural gradient effects and streamlined workflows.

Frequently Asked Questions (FAQ)

💎 Product Features & Multi-Layer Advantages

Q: What makes ST Multilayer Zirconia different from ST Pre-shaded?
A: ST Multilayer features a 4-layer gradient structure (cervical, body, incisal) that mimics natural tooth color and translucency transition, while ST Pre-shaded has uniform color throughout. This gradient creates more lifelike, natural-looking restorations, especially for anterior cases.

Q: How many layers does ST Multilayer have?
A: ST Multilayer has 4 distinct layers:
• Cervical layer (bottom): Higher chroma, lower translucency - mimics the gingival area
• Body layer (middle): Balanced color and translucency - main tooth structure
• Incisal layer (top): Lower chroma, higher translucency - natural cutting edge
This gradient flows smoothly from darker/opaque to lighter/translucent.

Q: What is the flexural strength of ST Multilayer Zirconia?
A: ST Multilayer Zirconia has a flexural strength of 1200 MPa, the same as ST White and ST Pre-shaded. This makes it suitable for both anterior and posterior restorations, though it's optimized for anterior esthetics.

Q: How many shade options are available?
A: ST Multilayer Zirconia is available in 20 comprehensive shades:
• 16 Vita shades: A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, D4
• 4 Bleach shades: BL1, BL2, BL3, BL4
Each shade features the same 3-layer gradient structure.

🔧 Milling & Processing

Q: How do I orient the restoration correctly during milling?
A: Critical: The gradient must flow from cervical (darker, bottom) to incisal (translucent, top). In your CAD software, position the restoration so the cervical margin is at the bottom of the disc, and the incisal edge is at the top. Incorrect orientation will reverse the gradient and compromise esthetics.

Q: Which CAD/CAM systems are compatible with ST Multilayer Zirconia?
A: ST Multilayer Zirconia Disc (98mm) is compatible with most open CAD/CAM milling systems, including Roland, VHF, Amann Girrbach, Sirona, and similar 98mm disc systems.

Q: What milling parameters should I use?
A: Recommended parameters:
• Bur size: 1.0-2.0mm diameter carbide or diamond burs
• Milling speed: 20,000-40,000 RPM
• Feed rate: Moderate (adjust based on detail)
• Milling type: Wet milling preferred
• Enlargement factor: 20-25% to compensate for sintering shrinkage

Q: Do I need to stain before sintering?
A: No! The gradient color is already integrated into the material. Simply mill with correct orientation and sinter – the gradient will fully develop during sintering. This saves 20-30 minutes compared to manual staining or layering.

Q: What is the linear shrinkage rate?
A: ST Multilayer Zirconia has a linear shrinkage rate of approximately 20-25% during sintering. Always design and mill restorations with this enlargement factor to achieve the correct final size.

🎨 Gradient & Esthetics

Q: Can I still apply surface stains for characterization?
A: Yes! While the gradient is pre-integrated, you can still apply surface stains after sintering for additional characterization, incisal effects, or fine-tuning. The gradient base provides a natural foundation.

Q: How does the gradient compare to natural teeth?
A: Natural teeth have a gradual transition from darker, more opaque cervical areas to lighter, more translucent incisal edges. ST Multilayer's 4-layer gradient replicates this natural phenomenon, creating restorations that blend seamlessly with adjacent teeth.

Q: What happens if I mill the restoration upside down?
A: If milled incorrectly, the gradient will be reversed - the incisal edge will be darker, and the cervical area will be translucent, resulting in an unnatural appearance. Always verify orientation before milling.

Q: Is ST Multilayer suitable for posterior restorations?
A: While ST Multilayer has sufficient strength (1200 MPa) for posterior use, it's optimized for anterior esthetics. For posterior restorations where gradient is less critical, consider ST Pre-shaded (more cost-effective) or HT (maximum strength).

🏥 Clinical Applications

Q: What cementation protocol should I use?
A: For ST Multilayer Zirconia restorations:
1. Clean restoration thoroughly
2. Consider airborne particle abrasion (50μm Al₂O₃) for improved bond
3. Use resin-modified glass ionomer or resin cement
4. Follow cement manufacturer's instructions
5. Ensure complete seating and remove excess cement

Q: Is ST Multilayer suitable for veneers?
A: Yes! ST Multilayer is excellent for anterior veneers. The gradient creates natural depth and vitality. However, ensure adequate thickness to showcase the gradient effect (minimum 0.8-1.0mm recommended).

Q: Can ST Multilayer be used for full-arch restorations?
A: Absolutely! ST Multilayer is ideal for full-arch cases where natural esthetics across multiple units is critical. The consistent gradient ensures all restorations have the same natural appearance.

📦 Ordering & Packaging

Q: What thickness and shade combinations are available?
A: ST Multilayer Zirconia is available in:
• 7 thickness options: 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm
• 20 shade options: 16 Vita shades (A1-A4, B1-B4, C1-C4, D2-D4) + 4 Bleach shades (BL1-BL4)

Q: How many restorations can I get from one disc?
A: Under normal nesting and standard posterior crown design, one 98mm zirconia disc (12mm thickness) can typically produce approximately 25–35 single crowns.
The actual yield may vary depending on crown design, tooth size, nesting efficiency, and processing loss.

Q: Do you offer sample discs for testing?
A: Yes! We offer sample discs for qualified dental laboratories. Contact our sales team at oneprodental@gmail.com to request samples and see the gradient effect firsthand.

Q: What is your shipping time?
A: We offer fast global shipping with delivery in 5-10 business days. Express shipping options are available for urgent orders. Free shipping on orders over $500!

🛠️ Technical Support

Q: What if I need help with orientation or processing?
A: Our technical support team is here to help! We assist with proper orientation, milling parameters, sintering protocols, and workflow optimization. Contact us at oneprodental@gmail.com anytime.

Q: Do you offer bulk pricing for dental laboratories?
A: Yes! We provide competitive volume discounts for dental laboratories. Contact our sales team for bulk pricing, partnership opportunities, and customized solutions tailored to your laboratory's needs.

💬 Still have questions? Contact our expert team at oneprodental@gmail.com or use the live chat feature. We're committed to your success with every restoration!

OnePro Dental Zirconia Series