IPS e.max® is an affordable, metal-free alternative to PFMs and provides world-class esthetics and outstanding marginal accuracy. Its unique lithium disilicate framework has added strength (500 MPa) for single-unit anterior or posterior crowns and 3-unit anterior bridges. IPS e.max can be cemented with low-expanding glass ionomer cements or bonded with resin cements when indicated. Prescribe IPS e.max to achieve maximum esthetics, virtually perfect contacts and occlusion, and impressive strength.
Anterior full-coverage crowns require a chamfer or shoulder margin. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30 degree; the width of the shoulder/chamfer is approximately 1 mm. Facial reduction is 1.5-2.0 mm; 1.0-1.5 mm lingual contact clearance. Incisal reduction is 1.5-2.0 mm with rounded internal line angles, and an incisal edge at least 1mm wide to permit optimum milling of the incisal edge during CAD/CAM processing.
Posterior full-coverage crowns require a chamfer or shoulder margin. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30 degree; the width of the shoulder/chamfer is approximately 1 mm. Occlusal reduction is 1.5-2.0 mm; axial reduction (buccal, lingual and interproximal) is 1.5 mm with rounded internal line angles.
For greatest strength, and where preparation allows for dry field (supra-gingival margins), it is recommended to use adhesive bonding, such as Multilink Automix® (Ivoclar Vivadent) or similar dual cure materials. For areas subgingival, or when a dry field cannot be achieved, Ivoclar Vivadent recommends a hybrid glass ionomer cement system with less than 0.5% expansion.
Below is a list of recommended resin cements: