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Somer Dental recommends this strong and esthetic restoration product for both crowns and bridges.
This is a perfect product for esthetic sensitive cases. The esthetics are quite beautiful and the overall strength of the material is impressive. Three-unit bridges with one pontic can be done with the second premolar as the most distal abutment. Please note that Somer does recommend conventional cementation of this product.
Eris is an excellent choice for vital looking crowns and strong enough for all-ceramic bridges. The fluorapatite layering ceramic permit the fabrication of all-ceramic bridges
that demonstrate properties similar to those of natural teeth.
Preparations:
The preparation significantly influences the stability and thus the durability, esthetics, and accuracy of fit of the restoration. Therefore, carefully design the
margins with a pronounced chamfer or shoulder (rounded inner edges). Avoid sharp transitions, inner angles, or feather edges.
Crown and bridge restorations
Minimum preparation requirements
Deep chamfer or shoulder: 1 mm
Coronal third of the crown: 1.5.mm
Occlusal and/or incisal: 2 mm
Inlays
Minimum preparation requirements
Fissure depth at isthumas: 1.5 mm
Width of the isthmus: 1.5 mm
Proximal boxes should be slightly flared; angle > 90°, no enamel edge
Functional contacts need to be observed
Crowns
Minimum preparations requirements
Deep chamfer or shoulder: 1 mm
Coronal third of the crown: 1.5 mm
Occlusal and/or incisal: 2 mm
Onlays
Same procedures as for inlays
2 mm of occlusal clearance is required for the cusp areas
Veneers
In the preparations of veneers, remember:
Veneer thickness approx. 0.6 mm
Provide a chamfer at the gingival margin
In stress bearing areas reduce tooth surface to provide bulk of ceramic for function.
Optimum method of cementation:
--Adhesive Cementation
Basically, adhesive cementation (Variolink® II) should be the objective. If there are
clinical reasons that speak against adhesive cementation, crowns and bridges with crown abutments which were fabricated with the IPS Empress2 layering material may also be cemented with ProTec CEM®(VIVADENT.)
Hybrid ionomer cements with higher degrees of expansion than ProTec CEM® must not be used.
Restorations fabricated with the IPS staining materials or the old IPS Empress layering materials must be seated using the adhesive technique.
If the adhesive method is impossible use Conventional Cementation
Conventional cementation should be carried out only…
1) In areas where adhesive cementation can not be achieved
2) If adequate retention is achieved, and
3) If the restoration was fabricated with the IPS Empress2 layering material.
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