Designing and milling a screw-retained implant crown or bridge in zirconia using exocad software involves a comprehensive digital workflow. Here's a detailed description considering all the details and keywords related to digital dentistry:

Digital Design Process:

1. Patient Assessment:

   • Begin with a thorough assessment of the patient's oral health, including digital scans or impressions to create a virtual model.

2. Import Digital Data into exocad:

   • Import the digital scans or impressions into exocad software to generate an accurate and detailed virtual representation of the patient's dental anatomy.

3. Material Selection:

   • Choose zirconia as the material for the implant crown or bridge, considering its strength, aesthetics, and biocompatibility.

4. Anatomical Design:

   • Design the anatomical shape of the zirconia crown or bridge, considering the patient's natural tooth anatomy and aesthetic preferences.
   • Ensure proper contouring and alignment with the underlying abutment.

5. Functional Considerations:

   • Optimize occlusion and functional aspects, ensuring the implant crown or bridge functions harmoniously with the natural dentition.
   • Verify proper articulation during various jaw movements.

6. Margins and Fit:

   • Define precise margins for the zirconia restoration to ensure a snug fit on the abutment.
   • Confirm the fit within the patient's oral anatomy, addressing any issues related to gaps or misalignment.

7. CAD Tools and Features:

   • Utilize exocad's CAD tools for detailed design modifications and adjustments.
   • Implement features specific to screw-retained restorations and implant-supported designs.

8. Connector Design:

   • Design the connector area between the zirconia restoration and the abutment, ensuring stability and strength.

9. Emergence Profile:

   • Customize the emergence profile for the implant crown or bridge to achieve a natural and harmonious transition from the restoration to the soft tissue.

10. Esthetic Customization:

    • Customize the aesthetics of the zirconia restoration, including shade, texture, and translucency.
    • Achieve a natural appearance that blends seamlessly with the patient's remaining dentition.

Digital Workflow Integration:

13. Digital Articulation:

    • Incorporate digital articulation to ensure proper alignment and functionality within the patient's bite.

14. Virtual Try-In:

    • Use virtual try-in tools to preview and evaluate the fit and aesthetics of the designed implant crown or bridge in the digital model.

15. Collaboration and Feedback:

    • Collaborate with dental professionals for feedback and adjustments, ensuring the design meets clinical and aesthetic requirements.

16. Final Quality Check:

    • Conduct a thorough review of the digital design, checking for accuracy, fit, and overall satisfaction with the aesthetics.

17. Export Design Files:

    • Export the finalized digital design files from exocad in a compatible format (e.g., STL) for the subsequent milling processes.

Milling Process:

18. Milling Machine Setup:

    • Prepare the milling machine for zirconia material, ensuring calibration and proper installation of milling burs.

19. Load Zirconia Blanks:

    • Load zirconia blanks into the milling machine, matching the specifications of the digital design.