Designing a digital zirconia crown or bridge using exocad involves a systematic process within the software. Here's a general description:

1. Digital Impression Scanning:

   • Begin by capturing a digital impression of the patient's teeth using an intraoral scanner.
   • Import the digital impression file into exocad software.

2. Modeling:

   • Utilize the exocad software's modeling tools to create a virtual 3D model of the patient's teeth and surrounding structures.
   • Define the preparation margins and key anatomical features accurately.

3. Material Selection:

   • Choose zirconia as the material for the crown or bridge. Specify the type of zirconia (e.g., high-translucency, high-strength) based on the clinical requirements.

4. Crown/Bridge Design:

   • Employ exocad's design module to create the crown or bridge digitally.
   • Ensure proper fit, occlusion, and alignment with adjacent teeth.
   • Fine-tune the contours and contact points for optimal functionality and aesthetics.

5. Virtual Articulation:

   • Simulate the patient's jaw movements and occlusion to verify the functionality and stability of the designed restoration.
   • Adjust occlusal surfaces as needed.

6. Texture and Color Mapping:

   • Add texture and color mapping to the virtual restoration for a realistic representation.
   • Consider shading and translucency to achieve a natural look.

7. Margin Analysis:

   • Perform margin analysis to ensure the precision of the restoration's fit at the preparation margins.

8. Quality Check:

   • Conduct a thorough quality check to identify and rectify any design imperfections.
   • Verify the restoration against established dental standards.

9. Export:

   • Export the finalized digital design file in a compatible format for further processing or milling.

10. Milling or 3D Printing:

    • Transfer the digital design to a milling machine or 3D printer that supports zirconia material.
    • Follow the manufacturer's guidelines for milling or 3D printing the physical restoration.

11. Post-Processing:

    • After fabrication, perform any necessary post-processing steps, such as sintering for zirconia, to achieve the desired strength and characteristics.

12. Delivery and Placement:

    • Deliver the final restoration to the dental office for placement.
    • Verify the fit and make any adjustments as needed during the seating process.

Throughout this process, exocad's tools and features provide a user-friendly interface for dental professionals to create precise and aesthetically pleasing zirconia crowns or bridges tailored to the patient's needs.