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With proper care, most teeth that have had endodontic treatment can last as long as other natural teeth. In some cases, however, a tooth that has received endodontic treatment fails to heal. Occasionally, the tooth becomes painful or diseased months or even years after successful treatment. If your tooth has failed to heal or has developed new problems, you have a second chance. Another endodontic procedure may be able to save your tooth.

Who performs endodontic retreatment?
Endodontists are dentists with at least two additional years of advanced specialty education in diagnosis and root canal treatment. Because they limit their practices to endodontics, they treat these types of problems every day. Endodontists are experts in performing nonsurgical and surgical retreatment. They use their special training and experience in treating difficult cases, such as teeth with narrow or blocked canals or unusual anatomy. Endodontists may use advanced technology, such as operating microscopes, ultrasonics and digital imaging, to perform these special services.

Why do I need another endodontic procedure?
As occasionally happens with any dental or medical procedure, a tooth may not heal as expected after initial treatment for a variety of reasons.

Narrow or curved canals were not treated during the initial procedure.

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Complicated canal anatomy went undetected in the first procedure.

The placement of the crown or other restoration was delayed following the endodontic treatment.

The restoration did not prevent salivary contamination to the inside of the tooth.

New decay can expose the root canal filling material to bacteria, causing a new infection in the tooth.

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A loose, cracked or broken crown of filling can expose the tooth to new infection.

A tooth sustains a fracture.

Retreatment Procedure
The endodontist will reopen your tooth to gain access to the root canal filling material. In many cases, complex restorative materials such as crowns, posts and core materials must be disassembled and removed to permit access to the root canals.

After removing the canal filling, the endodontist can clean the canals and carefully examine the inside of your tooth using magnification and illumination, searching for any additional canals or unusual anatomy that requires retreatment.

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After cleaning the canals, the endodontist will fill and seal the canals and place a temporary filling in the tooth. If the canals are unusually narrow or blocked, your endodontist may recommend endodontic surgery. This involves making an incision to allow the tip of the root to be sealed.

After your endodontist completes retreatment, you will need to return to your dentist as soon as possible to have a new crown or other restoration placed on the tooth to protect and restore it to full function.

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Is retreatment the best choice for me?
Whenever possible, it is best to save your natural tooth. Retreated teeth can function well for years, even for a lifetime.

Advances in technology are constantly changing the way root canal treatment is performed, so your endodontist may use new techniques that were not available when you had your first procedure. Your endodontist may be able to resolve your problem with retreatment.

How much will the procedure cost?
The cost varies depending on how complicated the procedure will be. The procedure will probably be more complex than your first root canal treatment, because your restoration and filling material may need to be removed to accomplish the new procedure. In addition, your endodontist may need to spend extra time searching for unusual canal anatomy. Therefore, you can generally expect retreatment to cost more that then initial endodontic treatment.

While dental insurance may cover part of all of the cost for retreatment, some policies limit coverage to a single procedure on a tooth in a given period of time. Check with your employer or insurance company prior to retreatment to be sure of your coverage.

What are the alternatives to retreatment?
If retreatment is not an option, then endodontic surgery should be considered. This surgery involves making an incision to allow access to the tip of the root. Endodontic surgery may also be recommended in conjunction with retreatment or as an alternative. Your endodontist will discuss your options and recommend appropriate treatment.

The only other alternative is extraction of the tooth. The extracted tooth must then be replaced with a bridge, removable partial denture or implant to restore chewing function and to prevent adjacent teeth from shifting. These procedures can be far more costly and time consuming than retreatment and restoration of the natural tooth.

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