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IPS e.max®

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IPS e.max®

IPS e.max®

The most esthetic of all-ceramic options, IPS e.max® is a lithium silicate glass-ceramic that can be fabricated as full-contour monolithic or cut-back and layered with porcelain for the ultimate in customization. This option can be milled or pressed at R-Dent.

Advantages of IPS e.max

High strength of up to 400 MPa with high esthetics, accurate fitting restorations that are minimally invasive, and four levels of translucency and additional impulse ingots for maximum flexibility.

R-Dent Technique

R-Dent uses CAD/CAM technology for e.max Press by creating a digital file of restoration, printing the file, and then pressing the restoration. This combines the added strength benefits of e.max Press with the preference predictability of e.max CAD.

Lithium Disilicate Benefits

  • Lithium disilicate is a high-strength ceramic material with a flexural strength at 360 to 400 MPa. Compare that to porcelain materials used in veneered zirconium crowns, which have a flexural strength of 80 to 110 MPa.
  • As with veneered zirconium oxide systems, conventional cementation can be used for lithium disilicate due to its high strength. Previous monolithic glass-ceramic structures required adhesive bonding because they did not have the structural strength of lithium disilicate.
  • Lithium disilicate achieves a very high translucency, and the material is available in four translucencies.
  • Traditional oxide ceramics that contain an oxide ceramic core material such as zirconia present some esthetic challenges since the zirconia has an increased opacity. This is not appropriate for inlays or onlays, partial crowns, or thin veneers.
  • Due to its strength and multiple translucencies, IPS e.max® lithium disilicate can be used for a wide range of indications.

Indications

IPS e.max is the premium lithium disilicate, glass-ceramic restoration. Combining lifelike materials and fracture resistant properties, IPS e.max is as durable as it is lifelike. The flexibility of IPS e.max makes it an excellent restorative method for anterior esthetics or posterior function.

Contraindications

Bridges which include molars, Maryland style bridges, and bridges which have a short vertical height that does not allow for adequate connector height.

Preparation

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°: the width of the shoulder/chamfer is approx. 1 mm. Facial reduction is 1.5 – 2 mm; 1 – 1.5 mm lingual contact clearance. Incisal reduction is 1.5 – 2 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 crown requires a chamfer or shoulder margin. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30°: the width of the shoulder/chamfer is approx. 1 mm. Occlusal reduction is 1.5 – 2 mm: axial reduction (buccal, lingual, and interproximal) is 1.5 mm with rounded internal line angles.

Cementation

IPS e.max layered – can be cemented using a resin reinforced glass ionimer such as RelyX Luting cement. Or bonded using a resin cement when extra strength is needed due to lack of retention on the prep, use a resin cement such as RelyX Unicem or RelyX Ultimate.

Tech Notes

If adjustments are needed, use fine diamonds with water and light pressure. Always remove the crown when adjusting or bond/cement crown before adjustments are made.).

Codes

D2740 Crown
D2610 Inlay for 1 surface
D2620 Inlay for 2 surfaces
D2630 Inlay for 3 surfaces
D2962 Labial Veneer
D2783 Crown 3/4 Porcelain Ceramic (does not include veneers)

“With the extensive prosthodontic training that I have received I have found it imperative to use a material that is superior in fit, esthetics, strength, and at the same time is not detrimental to the opposing dentition. Emax (lithium disilicate) is my restorative material of choice. It is extremely versatile—I commonly use it for implant restorations, full mouth reconstructions, veneers, inlays, and onlays. It can be pressed through the lost wax technique or milled and with the option for cutback offers outstanding esthetics. Emax offers an increased strength and superior bonding capabilities when compared to other dental ceramics. I have enjoyed working with R-dent Dental Laboratory for all my Emax needs.”

— Jonathon S. Egbert, DDS, Memphis, TN<

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