ST White Zirconia Disc(98mm) - Open System

Milling & Processing Workflow:

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

• Design restoration with 20-25% enlargement to compensate for sintering shrinkage
• 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 (white, porous material)

Step 2: Staining (10-20 minutes)

• Apply zirconia-compatible staining liquid by immersion or brush technique
• The porous pre-sintered structure allows stain penetration into the material
• Staining must be done BEFORE sintering for internal coloration
• Allow stained restoration to dry completely before sintering
• Multiple layers can be applied for the desired shade intensity

Step 3: Sintering (8-10 hours)

• Place stained restoration in a sintering furnace
• Follow the recommended sintering cycle (see table above)
• During sintering, the material densifies, and the stain becomes permanently 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 4: Glazing (Optional) & Cementation

• Optional: Apply glaze for enhanced surface finish (fire at 800-900°C)
• 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

⚠️ Important Note: Staining MUST be performed before sintering. The pre-sintered zirconia is porous and allows stain penetration. After sintering at 1500°C, the material becomes fully dense and staining liquid cannot penetrate - only surface coloration would be possible.

Why Choose ST Zirconia?

The ST (Standard Translucency) zirconia series is developed for cases requiring balanced performance. With 1200 MPa strength and 43% translucency, ST zirconia offers the perfect middle ground between maximum strength (HT) and maximum esthetics (SHT/UT).

This makes ST zirconia the most versatile option in our lineup, suitable for both anterior and posterior applications where you need reliable strength without compromising esthetics.

ST Zirconia vs HT Zirconia

Recommendation: Choose ST Zirconia for versatile applications requiring balanced strength and esthetics. Choose HT Zirconia for maximum strength in posterior-only cases.

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 White Zirconia Disc is an excellent choice for labs seeking a versatile, balanced zirconia solution for both anterior and posterior restorations.

Frequently Asked Questions (FAQ)

💎 Product Features & Balanced Performance

Q: What makes ST Zirconia different from HT and SHT zirconia?
A: ST (Standard Translucency) Zirconia offers the perfect balance with 1200 MPa strength and 43% translucency. It's stronger than SHT (1000 MPa) but more translucent than HT (39%), making it the most versatile option for both anterior and posterior restorations.

Q: What is the flexural strength of ST Zirconia?
A: ST White Zirconia has a flexural strength of 1200 MPa, which is approximately 3x stronger than lithium disilicate (360-470 MPa) and is suitable for most crown and bridge applications.

Q: Can ST Zirconia be used for anterior restorations?
A: Yes! With 43% translucency, ST Zirconia offers improved esthetics compared to HT zirconia, making it suitable for anterior crowns where you need both strength and natural appearance. For maximum esthetics, consider our SHT (47%) or UT (49%) series.

Q: What is the maximum span for bridges with ST Zirconia?
A: ST Zirconia's 1200 MPa strength makes it suitable for 3-4 unit bridges in both anterior and posterior regions. For longer spans, consider our HT zirconia (1300 MPa).

🔧 Milling & Processing

Q: Which CAD/CAM systems are compatible with ST Zirconia?
A: ST White 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: What is the linear shrinkage rate?
A: ST 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.

Q: Can I adjust the sintering temperature?
A: We recommend following the standard 1530°C sintering temperature for optimal strength and translucency. Deviating from this temperature may affect the final properties.

🎨 Staining & Esthetics

Q: Can ST White Zirconia be stained?
A: Yes! ST White Zirconia must be stained in the pre-sintered state (after milling, before sintering). The porous pre-sintered structure allows zirconia-compatible staining liquid to penetrate into the material. During the subsequent sintering at 1530°C, the stain becomes permanently fixed as the material densifies.

Q: Do I need to glaze ST Zirconia restorations?
A: Glazing is optional. While ST Zirconia can be polished to a high shine, applying a glaze can provide additional surface smoothness and esthetic enhancement. Use zirconia-compatible glaze materials.

Q: How does the 43% translucency affect esthetics?
A: The 43% translucency provides excellent esthetics for both anterior and posterior restorations. It's higher than HT zirconia (39%), offering more natural light transmission while maintaining excellent strength. This makes ST ideal for cases where you need both strength and esthetics.

🏥 Clinical Applications

Q: What cementation protocol should I use?
A: For ST 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 the cement manufacturer's instructions
5. Ensure complete seating and remove excess cement

Q: Is ST Zirconia suitable for implant-supported restorations?
A: Yes! ST Zirconia's 1200 MPa strength makes it excellent for implant-supported crowns and bridges. Its mechanical properties can withstand the forces transmitted through implant abutments.

Q: Can ST Zirconia be used for bruxers?
A: Yes! The 1200 MPa strength makes ST Zirconia suitable for patients with bruxism or heavy occlusal forces. For extreme bruxers, consider our HT zirconia (1300 MPa) for maximum durability.

📦 Ordering & Packaging

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: 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 milling or sintering parameters?
A: Our technical support team is here to help! We provide assistance with milling parameters, sintering protocols, troubleshooting, 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