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Somer Dental recommends the strong and esthetic Eris restoration product for both crowns and bridges and Empress for inlays and onlays. These are
perfect products for esthetic sensitive cases. The esthetics are quite beautiful and the overall strength of these materials is impressive.
For Eris, three-unit bridges with one pontic can be done with the second premolar as the most distal abutment. Please note that Somer does not recommend conventional cementation of the Eris product. Empress must be bonded.
The second generation of the revolutionary system in esthetic dentistry, IPS Eris, now offers the possibility to fabricate all-ceramic bridges. The new lithium disilicate
framework ceramic and the fluorapatite layering ceramic permit the fabrication of all-ceramic bridges that demonstrate properties similar to those of natural teeth.
Chromascop is the shade guide of choice by Somer Dental. IPS Eris harmoniously fits into the IVOCLAR-VIVADENT range of products in coordinated shades.
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 (Empress only)
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
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
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 Eris 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 older IPS Empress II layering materials must be seated using the adhesive technique.
If the adhesive method is impossible use Conventional Cementation
Please note: Somer does not recommend 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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