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IPS e.max CAD Contacts - PowerPoint PPT Presentation


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IPS e.max CAD Contacts. Issue. Occasionally, c ustomers have reported their proximal contacts are open after the crystallization process IPS e.max CAD material does shrink 0.2 % (volume), but this 0.2 % should be equivalent or very close to the amount of the glaze that is applied.

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Presentation Transcript
issue
Issue
  • Occasionally, customers have reported their proximal contacts are open after the crystallization process
  • IPS e.max CAD material does shrink 0.2% (volume), but this 0.2% should be equivalent or very close to the amount of the glaze that is applied
things to consider
Things to Consider
  • Recent AADR Study generated by Ivoclar Vivadent concluded the most “movement” of the ceramic was when the restoration design demonstrated:
    • Large bulk or thicknessin the wall design
    • Thin wall design
    • Either design AND unsupported by Object Fix may create movement that affects the contact
    • Unsupported was defined as a small amount of object fix to stabilize the pin, not filling the entire crown or supporting the margins
things to consider1
Things to Consider
  • Design or shape of the contact
    • A broad contact has more surface area and would be less likely to open after crystallization than a contact that is more pinpoint.
    • A broad contact is less likely to change

Broad Contact Pinpoint Contact

conclusion
Conclusion
  • Restorations supported by Object Fix showed more accurate fits than unsupported restorations
    • Always fill the restoration entirely with the object fix material as this provides support during the crystallization and minimizes any chance of distortion
    • Thick or thin wall designs not supported may show movement
    • Always use the approved crystallization temperatures and calibrate the porcelain furnace regularly. As temperatures fluctuate so does the chance that the shrinkage is greater 0.2%.