Saturday, November 27, 2010

Bruxzir™ and Emax™ the Highest Strength Metal Free Crown

One of the great dilemmas facing dentists is to create esthetic smiles for patients with severe wear, or destructive habits like habitual clenching and grinding (Bruxism)

severe wear

Historically, the material of choice for patients who have these conditions has been the use of cast metal. The metal used was usually gold alloy, semiprecious, or non precious alloy in  crowns and bridges. These metals gave restorations great strength and wear  resistance. Unfortunately, metal has horrible esthetics.

metal bridge

We still measure the longevity of all other restorative materials against metal alloy.  A gold crown can function  more than 50 years in the mouth.
In the early to mid 20th century, acrylic and porcelain were used to hide the metal and improve the esthetics of dental crowns and bridges. The problem with these esthetic restorations is the weaker porcelain can fracture off revealing the metal below. 

porcelain fractured off porcelain/metal bridge

 Since then not much has changed in the fabrication of restorations until the use of Dilithium Silicate marketed as Eris  and Zirconium marketed as Lava, and Procera® and others. These materials utilize the Dilithium Silicate or Zirconium as a base layer (core)  and overlay with porcelain. Dilithium Silicate is 3 times as strong as porcelain, while Zirconium is 10 times as strong as porcelain. These were the first strong  "Metal Free" restorations that were used for crowns and bridges. Since their introduction, fracturing of porcelain is still reported in bruxers as the porcelain is still weak, so we kept looking for stronger materials with good esthetics.

porcelain fracture off porcelain/zirconium bridge

 Through experimentation, newer shades of Dilithium Silicate and Zirconium have been developed which have acceptable esthetics.  These materials are E-Max and Bruxzir. Both of these materials can be milled out of a solid block of material. E-Maxcan be used with the CEREC™ in office milling system,which can be placed in a single visit for single crowns and onlays. Bruxzir™ must be made in a lab and will require 2 visits. Bruxzir has enough strength to be used in a full arch bridge.

 We have been placing E-Max crowns in one visit for over 2 years with no breakage. 
E-Max™ before
E-Max™ after

We  have been using the Lava system for several years for crowns and bridges and now will be able to offer the Bruxzir system as well for our more severe cases.

Bruxzir™ bridge before
Bruxzir™ bridge after
If you have any questions you can contact us at:

phone                   815 458 2202 

or Email us at

You comments are welcome



  1. Patients are choosing metal free restorations for a variety of reasons.Because the materials used today are more easily customized to the patient's needs, the cost adjustment when compared to metal is definitely significant. Less material is needed to fill a tooth with the biocompatible resin, as it is injected directly into the tooth with a more fine control than the lead and mercury fillings of the past. The resin will bond with the tooth, and will not constrict or grow as temperatures change, removing the possibility of further damage over time.

  2. A Crown is used to entirely cover damaged tooth. Besides strengthening a damaged tooth, a crown can be used to improve its appearance, shape or alignment. It can also placed on top of an implant to provide a tooth-like shape and structure to function. These are made purely from porcelain or ceramic and no other material like, porcelain fused to metal or only metal like gold, etc. These crowns are highly esthetic as the material of these crowns, allows the light to pass through them .It does not absorb the light like metal does, so they are lifelike and translucent , blending with the rest of the teeth. From Past several years Smile Delhi The Dental Clinic treated their patients with great care and compassion and provides superior quality crowns

  3. It is a great work but i got doubt what type of material will be taken to make crowns, and what are the conditions are to be kept in order to keep safe crown. please give me some suggestions.

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  5. The E-Max crown is a type of all-ceramic crown which is preferred for its longer lasting, aesthetic qualities. This crown and the Zirconia crown are worn due to their highly attractive appearance which ensures that they compliment the rest of your teeth. It is considered a good option for damaged, stained or poor quality teeth. This is a type of all-ceramic crown with an appealing translucent colour which is combined with extra strength and durability. This crown is made from a single block of lithium disilicate ceramic: this is a top grade material which has been harvested for its toughness, durability and opaque qualities which makes it a highly prized crown. Plus it is considered a breakthrough in dental crown technology. You get a glass ceramic crown which is tough and enduring but delicate in appearance.


About Me

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Born in the Midwest. Married with 6 children and 3 grandchildren. Attended Maine West High School, Harper Jr College, Northern Illinois University, the University of Illinois College of Dentistry. Practice in Crystal Lake, Illinois.