A family of products, and a variety of processing techniques, e.max is really a complete ceramic system designed to provide esthetic, metal free solutions for most indications. Neither zirconia nor feldspathic porcelain, e.max is the only lithium disilicate ceramic in dentistry today. This unique material can be milled from pre-manufactured block, or it can be pressed from a pre-manufactured ingot.
• Cementable: Pressing eliminates porcelain porosity resulting in higher strength. • Precise Fit: No Condensation Shrinkage improves fit and reduces adjustment time.
Anterior Crowns: Optimal esthetics and reliable strength are achieved by “pressing” the e.max lithium disilicate into a coping, then veneering the coping with Ivoclar’s e.max Ceram to achieve translucency and internal effects. Posterior Crowns: The e.max posterior crown is pressed to full contour, then stained and glazed. This “Monolithic “ crown has the high strength you need for posterior cementation.
The weak link in any PFM crown, or any zirconia crown, is not the coping. Cast metal or milled zirconia copings are both strong enough (>1000mpa). But the interface between the coping (25-40mpa) and the porcelain veneer (90-110mpa) built to cover the coping, are inherently weaker. Most observers agree, ceramic failures, whether on metal or zirconia, fail at these two “weak” points. An e.max pressed “Monolithic” crown has no interface, and no layered veneer. And because the ceramic ingots are blended with dentin colored and translucent ceramics, these posterior crowns match posterior dentition with slight translucency in cusp tips.