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IPS Empress® |
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- PDF Documents
- Tech Notes
- Indications
- Preparation
- Cementation
- Working Time
- ADA Codes
TECHNICAL NOTES
If an adjustment is required on the ceramic, ALWAYS CEMENT OR BOND INTO PLACE BEFORE PROCEEDING, then use a fine diamond with water and air to keep the crown cool. To contour the ceramic, polish with a pink rubber wheel and diamond polishing paste (Brassler, Shofu and Vident).
Caution: Do NOT attempt to fire porcelain. It must be done in precisely calibrated ovens at special temperatures and vacuum settings.
For best results, return crown for reglaze firing to lab.
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INDICATIONS / CONTRAINDICATIONS
IPS Empress is recommended for anterior single crowns, inlays, onlays and veneers. IPS Empress veneer is recommended for anterior restorations to block out mild staining, close diastemas or to just enhance esthetics.
IPS Empress should not be used on patients with malfunctional occlusion such as bruxers or clenchers. IPS Empress should not be used as abutments for cast partials. IPS Empress should not be used in situations when preparation requirements cannot be achieved. IPS Empress veneer is not to be used in the case of correcting severe stain situations such as tetracycline.
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PREPARATION
Anterior full-coverage crowns require a chamfer with 1.5 - 2 mm facial reduction, 1 - 1.5 mm lingual contact clearance, 1.5 - 2 mm incisal reduction 1 - 1.5 mm reduction at the gingival margin with rounded internal line angles; or a shoulder with 1 mm lingual reduction, 2 mm incisal reduction, 1.5 mm labial reduction, 1 mm 360° rounded shoulder.
Posterior full-coverage crowns require a chamfer margin with 1.5 - 2 mm occlusal reduction, 1.5 mm buccal and lingual reduction with rounded internal line angles; or a shoulder with 1.5 - 2 mm occlusal reduction, 1.5 mm buccal and lingual reduction and 1 - 1.5 mm gingival margin reduction with rounded internal line angles.
Inlays and onlays require 1.5 - 2 mm isthmus width, 1 - 1.5 mm wide gingival floor with rounded internal line angles and butt joint margins.
Veneers require a uniform preparation and lingual reduction to increase strength. A medium-grit round-ended diamond is used to join the depth cut grooves to establish a uniform preparation and porcelain thickness of at least 1 mm. The diamond is angled to eliminate undercuts and establish a butt joint on the lingual aspect of the preparation. The incisal edge should be rounded to eliminate sharp line angles.
Chamfer Margins - Correct preparation of the chamfer margins interproximally allows the appropriate bulk of porcelain.
A Slice Preparation - This technique enables the ceramist to close the space and avoid unnatural lingual contours.
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CEMENTATION
Adhesive bonding/dual cure materials including:
Variolink (Ivoclar Vivadent)
Choice (Bisco, Inc.)
Insure (Cosmedent, Inc.)
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WORKING TIME
5 Days In-lab
Rush Cases : All rush cases must be prescheduled by calling 800-944-7874 before the case is shipped. Time of pickup and delivery may affect turnaround time.
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CODES
D2740 Crown
D2610 Inlay for 1 surface
D2620 Inlay for 2 surfaces
D2630 Inlay for 3 surfaces
D2962 Labial Veneer
D2783 Crown 3/4 Porcelain Ceramic (does not include veneers)
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