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What are the preparation requirements for an IPS e.max® Layered crown, and why do they matter?

The core principle: make room for two materials

A layered crown must house both the lithium disilicate core and the porcelain veneer on top of it. Under-preparation is the most common reason a beautiful layered case underperforms — without space, the ceramist is forced to choose between bulky contours and a thin, fragile porcelain layer.

Margin geometry is non-negotiable

A chamfer or shoulder with a rounded internal form distributes stress. Knife-edge margins and sharp or right-angle internal line angles concentrate stress and complicate seating, so ROE explicitly excludes them.

Preparation parameters

Parameter Requirement
Prep design Chamfer/shoulder with 4–8° axial wall taper
Margin Minimum 1 mm chamfer margin, 10–30°
Occlusal clearance Minimum 1.5 mm
Labial & lingual clearance Minimum 1.5 mm
Margins to avoid No knife-edge margins; no sharp or right angles

Practical tips

  • Check clearance dynamically. Anterior teeth often look adequately reduced in maximum intercuspation but contact the opposing dentition in protrusion or lateral excursions — exactly where a thin layered restoration is most vulnerable. Verify in centric and excursive positions before the final impression.
  • Reduction drives esthetics. Color and translucency are functions of porcelain thickness. Consistent 1.5 mm facial reduction gives the ceramist the depth the case was selected for.
  • Confirm, don't estimate. Use a silicone index or reduction guide rather than judging reduction by eye.

 

Additional Resources

For more information concerning the IPS e.max Layered:

Contact Information

For help with a Locator Fixed solution for your next case, contact ROE Dental Laboratory: