Cutting the crowns

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Posted on By Moh Abr In Armamentarium

There are some carbide burs with cross cuts known as crown cutters.Do they really cutter faster than a diamond bur?Do they become blunt later?
Are there any other options to remove a firm crown?

Dr Mohammad Abrisham

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Dear Dr.Abrisham,
In regard to your questions to DentalXP…
“Which bur is the best for cutting a crown? Diamond burs or carbide ones? There are some carbide burs with crosscut said that is suitable for that purpose. Do you agree? Would you please tell me if there is any other techniques other than cutting to remove a firm crown?”
My answers are as follows:
1. If you are referring to cutting off an existing crown that may be all-ceramic or even zirconia, I would suggest the extra course Duracut diamonds from Brasseler,USA and specifically the # 6856DC which makes a thin slice in the buccal surface of the crown and even into the occlusal surface. Then, use the Goldstein Crown Remover, GCR45 or GCR90 (Hu-Friedy) to torque it off. If you are removing a ceramo-metal crown the porcelain should first be cut as above with the Duracut diamond (Brasseler,USA) and then use the crosscut H34L.012 (Brasseler,USA) to cut the metal and then use the Crown removing instruments to torque the crown off. This way you will not be putting force on the tooth itself which could result in fracture. The crown removing instruments only torque the crown material itself. You can also order a brochure from Hu-Friedy that describes the instruments.

2. I am not one who favors cutting porcelain with carbide burs because diamonds cut much smoother and make it easier to torque the crown off.

3. Other techniques for removing a firm crown depend on the cement the crown was inserted with. If either zinc phosphate or glass ionomer or resin modified glass ionomer was used then you must cut it off. However, if Duralon, or one of the interim cements such as Temrex or Moyco or TempBond was utilized, have the patient rinse for several minutes with hot water (as much as the patient can stand without burning the tissue) and immediately grab the crown with either pin setting pliers or a firm crown removing pliers and try to remove the crown…you can also use the pliers combined with a reverse hammer and carefully balance your grip so a vertical pull is suddenly used several times to help remove the crown.

I hope the above answers your questions.
Most sincerely, and thanks for being a member of DentalXP. Hope to see you at the Global Symposium in Las Vegas next February 7-9.

Ronald Goldstein, DDS


Dental crown lengthening involves the removal of gum tissue, bone or both to expose more of a tooth's structure. Why would you need it? You might have broken a tooth at the gum line. Or you might just have a decayed tooth. Sometimes after your dentist removes the tooth decay, there isn't enough tooth structure left above the gum line to support a dental crown (or even a large tooth filling). Without enough structure to grab on to, ill-fitting dental crowns may cause chronic inflammation and irritation. Even worse, tooth decay may get in under the dental crown, creating the need for more dental treatment. You might even lose the tooth completely.
Although less common, crown lengthening may also be used cosmetically to treat what's called a "gummy smile." When an unusually large amount of gum tissue shows around the upper teeth, crown lengthening might help. Your dentist can expose more of your teeth, then sculpt your gum line to create the look you want.You can visit at you will get your answer.


Augma Bio