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IPS E.max preparation

IPS e.max® is an innovative all-ceramic system which covers the entire all-ceramic indication range – from thin veneers to long-span bridges.
IPS e.max delivers high-strength and highly esthetic materials for the Press and the CAD/CAM technologies. The system includes the innovative lithium disilicate glass-ceramic used mainly for single-tooth restorations, hybrid
abutments and small bridges, as well as the high-strength zirconium oxide for long-span bridges.

All ceramic materials are based on an integrated material and shade concept for restorations as individual as your patients.

Lithium disilicate glass-ceramic (LS2)
Lithium disilicate (LS2) glass-ceramic is ideally suitable for the fabrication of hybrid abutments,as well as monolithic single-tooth restorations and may even be indicated for 3-unit bridges up to the premolar region. Its
clearly higher stress resistance and its outstanding esthetic appearance.

Zirconium oxide (ZrO2)
High-strength zirconium oxide (ZrO2) really proves its worth in long-span bridges. Zirconium oxide is characterized by its excellent biocompatibility and low heat conductivity and can be indicated for singletooth restorations and up to 14-unit bridges. Zirconium oxide can be veneered with nano-fluorapatite or lithium disilicate glass-ceramic.

Fluorapatite glass-ceramic (FAP)
IPS e.max Ceram is a highly esthetic layering ceramic for the IPS e.max System. Thanks to the one common layering ceramic, all the veneered IPS e.max restorations exhibit the same wear properties and surface gloss.
Zirconium frameworks pressed over with IPS e.max ZirPress, which are either stained or veneered, are an alternative to conventionally veneered frameworks.

Tooth – Shade determination

The following guidelines and notes must be observed by both the dentist and the laboratory

The overall esthetic result of an all-ceramic restoration is influenced by the following factors:
• Shade of the tooth stump (natural stump, devitalized stump, core build-up, abutment)
• Shade of the cementation material
• Shade of the restorative material (framework shade, translucency/opacity, brightness, veneer, characterization)

Shade determination of the natural tooth
– Determine the tooth shade of the non-prepared tooth and/or the adjacent teeth after tooth cleaning.
– In addition, determine the cervical shade if a crown preparation is planned, for example.
– Determine the shade at daylight and in front of a neutral background.
– Avoid intensively coloured clothes and/or lipstick as these may compromise the result.
– Use the A-D Shade Guide or Chromascop Shade Guide

When to Use e.Max Crowns

  • Full coverage crowns
  • Inlays
  • Onlays
  • Pressable ceramic veneers
  • e.Max crowns are not recommended for patients with bruxism or a hard bite.Instead, consider Zirconia crowns  for bruxism patients.

E.Max Crown Preparations

  • E.Max crown preparation is similar to full metal crowns.
  • Preparation for e.Max is less aggressive than for zirconia or porcelain fused-to-metal crowns
  • E.Max preserves the natural structure of the tooth

Cementation

Cementation e.Max crowns is achieved by both bonded (adhesive) and mechanical retention.

Because cement is the weakest link, the tooth preparation itself should be well-designed and shaped allowing the best possible retention of the crown without cement. IPS eMax restorations have two different possibilities for cementation: adhesive bonding and conventional cement.

Adhesive methods take advantage of chemically bonding the lithium disilicate restoration to the tooth preparation in addition to mechanical retention, yielding a crown that is less likely to come off over time.

Convention cementation allows for mechanical retention only and would make it easier to retrieve the restoration should you believe it may be necessary in the future (i.e. the possible need of endodontic treatment).

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