IPS e.max ZirCad are presintered, yttrium-stabilized zirconium oxide blocks for the CAD/CAM technology. After thorough sintering, the material forms a polycrystalline oxide ceramic material made up of a tetragonal zirconium oxide phase (TZP). The material demonstrates a high fracture resistance and its fracture toughness is more than twice that of glass-infiltrated ceramic, with more than 900 MPa flexural strength. Features a high fracture resistance combined with high fracture toughness as a result of the transformation reinforcement of the ZrO2 crystals. As a result, the material meets the clinical requirements to withstand the masticatory forces, particularly in the posterior region. Therefore, IPS e.max ZirCAD supplements the range of indications of the IPS e.max material in an ideal fashion. The high-strength IPS e.max ZirCAD frameworks are either pressed-over using IPS e.max ZirPress and/or veneered using IPS e.max Ceram.
Indications
- Crown frameworks for the anterior ad posterior regions
- 3- 4-unit bridge frameworks for the anterior and posterior regions
- Inlay-retained bridges
- Primary telescope crowns
- Implant superstructures (single tooth and bridge frameworks)
- Veneers
- Anterior and posterior crowns
Preparation Guidelines and Minimum Thickness
Successful results can only be achieved with IPS e.max ZirCAD if the guidelines and framework thicknesses are strictly observed.
Crowns and Bridges
The anatomic shape is evenly reduced while observing the given minimum framework thickness. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30°: The width of the circular shoulder/chamfer is approx. 1 mm. Reduction of the crown third – incisal or occlusal by approx. 1.5 mm. For anterior crowns, the labial and palatal/lingual part of the tooth should be reduced by about approx. 1.2 mm. The incisal edge of the preparation should be at least 1 mm (milling tool geometry) in order to permit optimum milling of the incisal area during CAD/CAM processing.
Cementation
We advise against the use of traditional phosphate cements, since they negatively influence the light transmission through the all-ceramic and compromise the aesthetic appearance of the all-ceramic restorations. Pressed-over, inlay-retained bridges must be seated using adhesive cementation.
IPS e.max Ceram
This is a layering ceramic that is compatible with all of the IPS e.max substructure materials. We are able to create an evenly matched smile design when different substructures are used.
|
 IPS e.max ZirCAD
|
