Istar Dental Lab Zirconia Screw Retained Implant Crown

Hello from Istar Dental Lab. We offer excellent services to dentists, dental hospitals, and dental labs of all sizes. We know you need products that are strong, look great, and are simple to work with. That is why we are happy to offer the Zirconia Screw-Retained Implant Crown.

Zirconia screw-retained implant crowns are a key part of modern tooth replacement, providing a strong and beautiful option for single or multiple tooth repairs on implants. At their heart, these crowns connect right to the dental implant with a screw, so you don’t need to use regular dental glue. This design is based on solid science about how things work in the mouth and has major benefits for patients.

The reasons for choosing screw-retained crowns are very strong:

• Easy to Remove: This is a main benefit. It lets you take the crown out without damage for check-ups, repairs, or to fix any problems. This saves a lot of time at the dentist’s office and lowers the chance of hurting the crown or the implant.
• No Leftover Cement Risk: A big worry with glued-on crowns is leftover cement under the gums. This is a known cause of gum problems like peri-implant mucositis and peri-implantitis. Studies show that leftover cement is found in many glued-on cases and is closely linked to swelling and bone loss around the implant. Using a screw avoids this health problem completely.
• Better Cleaning and Care: Being able to easily take out the crown allows for a deep cleaning around the implant. This helps keep the area healthy for a long time.
• Works Well in Tough Spots: Screw-in designs are especially helpful for replacing a full row of teeth or in cases where there is not much room between teeth, where cleaning up cement would be very hard or can’t be done.

Key Features of Our Zirconia Screw-Retained Implant Crown

We choose zirconia for screw-retained implant crowns because of its great strength, appearance, and how well it works with the body. But not all zirconia is the same. Different types of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) have different levels of strength and how see-through they are, so you need to choose the right material for each case.

Zirconia Generations and Properties:

• 3Y-TZP (3 mol% Y2O3): This type always shows the best bending strength, usually between 900–1200 MPa. It is also very resistant to cracks because of its strong self-toughening ability. However, it is less see-through (translucency parameter, TP: 11–13), making it not as good-looking for front teeth. It can also break down more easily over time in wet places (low-temperature degradation, LTD), especially after treatments like sandblasting.
• 4Y-TZP (4 mol% Y2O3): This type offers a good balance, with bending strength around 700–900 MPa and good crack resistance (3–4 MPa·m^0.5). It is more see-through (TP: 14–16) than 3Y-TZP.
• 5Y-TZP (5 mol% Y2O3): This type focuses on looking clear (TP: 16–19), almost like glass-based materials, but it is not as strong (600–800 MPa bending strength) and is less resistant to cracks (2–3 MPa·m^0.5). The higher yttria content increases the cubic phase, which makes it less tough but much better at resisting LTD.
• Multi-layered Zirconia: These materials mix different types of zirconia in one piece, making a gradient that looks like a real tooth. For example, the neck layers (dentin) can be stronger (like 3Y-TZP), while the biting edge layers (enamel) are more see-through (like 5Y-TZP). This gives the best mix of strength and looks.

Clinical Performance and Complications:

Large studies show that solid 3Y-TZP crowns have very low fracture rates over 5 years (0.5–1.5%) and very little chipping (<2%). While 4Y/5Y-TZP crowns have slightly higher fracture rates (1–3% at 5 years), especially on back teeth that do a lot of chewing or in patients who grind their teeth, the crowns still work very well most of the time. Chipping of the outer ceramic layer, when used, is still the most frequent technical problem for layered zirconia, but solid, one-piece designs mostly avoid this.

The Istar Digital Workflow

At Istar Dental Lab, our advanced digital process shows our focus on being exact and fast when making zirconia screw-retained implant crowns. This complete process uses the latest technology to make sure the fit, function, and look are perfect.

The Digital Workflow: A Smooth Process

Today’s digital process for making a single zirconia screw-retained crown is very connected:

1. Getting Digital Scans: This starts with detailed mouth scans (for example, using advanced light scanners) to get exact data of the teeth. This is often combined with CBCT scans to see the exact implant spot and bone shape.
2. Digital Implant Planning: Special software combines the scan and CBCT data. This allows for placing the implant on a computer, setting the right angle, and checking the surrounding areas.
3. Virtual Abutment and Crown Design: Using advanced dental CAD software, the abutment and crown are designed on a computer. This includes:
   • Screw Channel Angulation: Advanced CAD software has an automatic angle correction for the screw hole. It allows for up to a 30° angle to make it look better and easier to reach, especially on front teeth. This makes the screw hole harder to see.
   • Emergence Profile Customization: Digital tools and AI help make a custom shape where the crown meets the gum. This is important for supporting the gums and looking natural.
   • Occlusal Morphology Control: AI-powered design uses the patient’s specific bite and simulates how they chew. This greatly cuts down on adjustments at the dentist’s office and makes the crown work better.
4. CAM Milling: The computer-designed crown is then sent to very accurate 5-axis milling machines. These machines use the best cutting paths to make sure the edges fit perfectly and the surface is smooth.
5. Sintering: After milling, the zirconia crown is heated in a special oven. These ovens can finish single zirconia crowns quickly (for example, in 20–40 minutes), and studies show this happens without any real loss in strength or how well it fits, as long as the right steps are taken.
6. Post-Sintering Treatments: The last steps include careful polishing, coloring, and glazing to get the right look and a smooth finish.

When to Use a Zirconia Screw-Retained Implant Crown

A screw-retained zirconia crown is a great choice for many situations.

• Limited Space & Full Arch Cases: Screw-in designs are especially good for replacing a full row of teeth and in cases with not much room between teeth, where cleaning up cement would be very hard or can’t be done.
• Easy Access: The main benefit is that it’s easy to take out, allowing you to remove it without damage for check-ups, repairs, or to fix any problems.
• Strength Needed: They are perfect for patients with teeth grinding habits, although the crowns still work very well overall.
• Healthy Gums: Using a screw completely avoids the health problem of leftover cement under the gums, which is a known cause of gum problems like peri-implant mucositis and peri-implantitis.

Comparing Your Restoration Options

To really understand the benefits of zirconia screw-retained implant crowns, you need to compare them with other choices for tooth repair, especially glued-on crowns and traditional metal-ceramic (PFM) crowns.

Order Your Zirconia Screw-Retained Implant Crown Today!

Choose Istar Dental Lab for a better tooth repair experience. Our Zirconia Screw-Retained Implant Crown gives you strength, a great look, and confidence.

Contact us today to get started