1. IPS e.max CAD Contacts

2. 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

3. 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 thickness in 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

4. 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

5. 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%.

6. IPS e.max CAD Contacts