IPS e.max CAD Contacts

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

• 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

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

• 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%.

IPS e.max CAD Contacts