IPS Eris™
Anterior Crown
Preparation		 | Anterior 3-Unit
Bridge Preparation		 | Posterior Crown
Preparation		 | Posterior 3-Unit
Bridge Preparation


Shade Selection
Recommended Shade Guides: Ivoclar Chromascop®, Vita Lumin.

General Considerations:

  • All single-unit crowns, inlays, onlays and crowns should have adequate tooth structure to allow for the marginal placement to be at or above the free gingival margin tissues.
  • IPS Empress 2 full coverage crowns and bridges should be prepared so that all margins are at or above the free gingival tissue. If the preparation requires cervical extension, the margin placement should be on sound tooth structure not invading the biological width.
  • Empress 2 framework material should be at least 0.8 mm in thickness for optimal strength.
  • It is necessary to take a stump shade with Empress 2.

ANTERIOR CROWN PREPARATION
  • Reduce lingual surface 1.5 mm at the area of the centric contact (not less than 1.0 mm) and 0.8 to 1.0 mm along the remaining lingual surface.
  • Incorporate taper of 8 to 10 degrees (never more than 12º)
  • Tooth preparation length should reflect a 1.5 to 2.0 mm occlusal (incisal) reduction.

ANTERIOR 3-UNIT BRIDGE PREPARATION

  
  • All teeth considered for use as bridge retainers must provide adequate clinical crown length to allow for preparation to achieve ideal resistance and retention form.
  • The clinical crown length of the retainer tooth next to the edentulous space must be of adequate length to allow for the required occlusal-gingival connector height. These critical connector dimensions are directly related to the occlusal force they are required to function against.
  • In the anterior region, the connector dimensions are to be 4 mm (occlusal-gingival) and 4 mm (buccal-lingual).
  • In the premolar region, connector dimensions are to be 5 mm (occlusal-gingival) and 4 mm (buccal-lingual).

Pontic Span

  • Maximum pontic spans will vary from patient to patient depending on the tooth position, size, condition and arch position of the retainers.
  • Pontic spans should not exceed 9 mm posterior to canine and 11 mm anterior to canine.
  • Measurements for this determinant are made from the unprepared abutment surfaces next to the edentulous space.

POSTERIOR CROWN PREPARATION

POSTERIOR 3-UNIT BRIDGE PREPARATION

Reprinted with the permission of Ivoclar North America. IPS Empress is a registered trademark of Ivoclar North America, Inc.

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