Short answer: E-max crowns are made from lithium disilicate glass-ceramic, and Empress crowns from leucite-reinforced glass-ceramic; both are metal-free all-ceramic crowns. Because they transmit light in a way similar to natural enamel, they look natural, especially on front teeth. E-max is stronger than Empress, while zirconia offers greater strength for back teeth and long bridges. The choice of material is made with your dentist based on the position of the tooth and your bite.
Many people with discoloration, fractures or large fillings in their front teeth are looking for a crown that looks natural and contains no metal. The two names heard most often in this search are e-max and Empress crowns. These restorations, also widely known simply as emax crowns, are made from glass-ceramic materials that can transmit light in a way similar to natural tooth enamel. In this article we explain what e-max and Empress are, how they differ from zirconia, which teeth they are preferred for and how to care for them so they last.
What is an all-ceramic crown?
An all-ceramic crown is a dental crown made entirely of ceramic material, with no metal in its substructure. In traditional porcelain-fused-to-metal crowns, the metal underneath blocks the passage of light and, when the gum recedes, can cause a dark line to appear at the edges. All-ceramic crowns do not have this problem; light passes through the crown, creating a sense of depth and vitality similar to a natural tooth.
All-ceramic materials are divided into different groups. Glass-ceramics (which include e-max and Empress) stand out for their esthetic qualities, while oxide ceramics such as zirconia offer greater strength. Which material is chosen depends on the position of the tooth, chewing forces and esthetic expectations.
What is e-max?
E-max is an all-ceramic restoration system made from a high-strength glass-ceramic called lithium disilicate. It is considered a well-balanced material in terms of both esthetics and strength and has a wide range of uses in dentistry.
The main features of e-max are:
- Light transmission: Thanks to translucency similar to natural enamel, it blends in with neighboring teeth.
- Strength: It has high fracture resistance among glass-ceramics.
- Bonding ability: Because it can be bonded to the tooth with special adhesives, it provides strong retention even in thin restorations.
- Versatility: It can be used for single crowns, veneers, inlays and onlays.
- Tissue compatibility: Thanks to its smooth surface, it is compatible with the gums and has a low tendency to retain plaque.
E-max restorations can be made using digital impressions and computer-aided design and manufacturing methods, or with a pressing technique.
What is an Empress crown?
Empress is an all-ceramic restoration system made from a glass-ceramic reinforced with leucite crystals, notable especially for its esthetic qualities. It can give results very close to natural teeth in terms of light transmission and color gradation.
Empress has lower fracture resistance than e-max. For this reason, it is generally preferred in areas where chewing forces are lower:
- Single crowns on front teeth
- Veneers (porcelain laminates)
- Inlays and onlays
Today, many clinics use e-max more often because it can offer similar esthetic results with greater strength. Nevertheless, Empress is still an option used in suitable cases. The dentist decides which system to use after assessing the condition of the tooth and your expectations.
How do e-max and Empress differ from zirconia?
E-max and Empress stand out for their esthetics, while zirconia stands out for its strength; the main difference between them is the balance between light transmission and fracture resistance. Each material has different strengths.
- Strength: Zirconia has markedly higher fracture resistance than glass-ceramics. For this reason, it is often preferred for back teeth and multi-unit bridges.
- Light transmission: Glass-ceramics offer more natural translucency, especially on front teeth. Zirconia materials have also become more esthetic over the years, but their light transmission is generally more limited than that of glass-ceramics.
- Tooth preparation: Because glass-ceramics bond strongly with adhesive cementation, they can be used for restorations that require less tooth tissue removal, such as veneers.
- Bridges: E-max can only be used for limited bridges in the front region, while zirconia is suitable for longer bridges.
- Color masking: If there is a dark tooth, a metal post or an implant component underneath, zirconia can have an advantage in covering the color.
In practice, many patients may prefer combinations such as glass-ceramic on the front teeth and zirconia on the back teeth.
Which teeth are they preferred for?
E-max and Empress restorations are most often preferred for front teeth and areas where esthetic expectations are high; in suitable cases, e-max can also be used on premolars and for single back-tooth crowns. The main factors that determine the choice are the position of the tooth, the remaining tooth tissue and the person's bite.
Situations in which an all-ceramic crown may be considered include:
- Teeth whose discoloration cannot be removed with whitening
- Fractured or heavily worn front teeth
- Teeth weakened by large, old fillings
- Teeth that need to be strengthened after root canal treatment
- Teeth with irregular shape or size
- Small gaps between the teeth
In people who clench or grind their teeth, the risk of glass-ceramics fracturing may increase; for these patients, the material is chosen more carefully and a night guard may be recommended. For teeth with marked crowding, considering orthodontic treatment first instead of crowns can allow less tooth tissue to be removed. Restorations done after the position of the teeth has been corrected with clear aligners generally allow for a more conservative plan.
How is an e-max crown done?
An e-max crown is usually completed over a few sessions and consists of tooth preparation, impression, temporary crown, try-in and cementation. The process goes as follows:
- Examination and planning: The condition of the teeth and gums is assessed, and expectations for color and shape are discussed.
- Tooth preparation: Under local anesthesia, tissue equal to the thickness of the crown is removed from the tooth.
- Impression: An impression is taken with a digital scanner or conventional impression materials, and the shade is selected.
- Temporary crown: A temporary crown is placed to protect the tooth and maintain esthetics until the permanent crown is ready.
- Try-in and cementation: After the fit, color and bite of the crown are checked, it is permanently placed with special adhesives.
Because the treatment fee varies with the number of restorations and the scope of the case, it is provided in writing after the examination and planning.
Lifespan and care
E-max and Empress crowns can be used for many years in most cases when placed for the right indication and well cared for. The lifespan of the restoration depends on factors such as oral hygiene, gum health, eating habits and clenching.
- Brush twice a day with fluoride toothpaste; avoid highly abrasive whitening toothpastes.
- Clean the junction between the crown and the gum with floss or interdental brushes.
- Do not bite hard objects such as pens, fingernails, ice or nuts in their shells with your front teeth.
- If you clench your teeth, wear the night guard your dentist recommends regularly.
- Have a check-up and professional cleaning every six months.
The tooth under a crown can still decay; keeping the margins in particular clean is important. For your other questions, you can visit our frequently asked questions page.
Assessment for all-ceramic crowns in Ankara
Determining which material is suitable for color, shape or fracture problems in your teeth is possible through an examination of your teeth and your bite. At our polyclinic next to Panora Mall in Çankaya, we explain the e-max, Empress and zirconia options and how suitable each is for you; to make an appointment, you can use our contact page.
Frequently asked questions
Is emax or zirconia more suitable?
The two materials have different strengths. E-max gives a natural appearance, especially on front teeth, thanks to its light transmission, while zirconia stands out on back teeth and bridges thanks to its greater strength. The choice is made with your dentist based on the position of the tooth and your bite.
Do emax crowns change color?
Because the e-max ceramic surface is smooth and glossy, it is generally resistant to staining. However, staining may appear over time at the crown margins or at the junction with the gum. Regular cleaning and check-ups help prevent this.
Does the tooth need to be filed down for an emax crown?
For a crown, tissue equal to the thickness of the restoration has to be removed from the tooth. The amount removed varies with the type of restoration; less tissue is removed for veneers and more for full crowns. The procedure is done under local anesthesia.
Can people who clench their teeth have emax crowns?
Clenching and grinding can increase the risk of glass-ceramic restorations fracturing. For these patients, the material is chosen more carefully and a night guard is recommended to protect the crowns. Suitability is assessed during the examination.
