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Causes And Treatment Of Root Canal Disease

Why Does My Tooth Need Root Canal Treatment?

A tooth generally needs a root canal procedure because the pulpal tissue inside the tooth has become irreversibly injured because of root canal disease. The tooth pulp is composed of elements similar to any other tissue in the body and is susceptible to injury from bacterial decay, repeated or extensive dental procedures, traumatic accidents, or advanced periodontal disease. Pulpal disease occurs in an anatomically complex space termed the root canal system. When appropriate, root canal treatment is directed towards removing inflamed or abscessed tissue, disinfecting, and preparing this space to receive a biocompatible filling material. Once the root canal system has been sealed and a protective crown placed by an endodontist, the tooth can be retained as a healthy and functional member of the dental arch.

What Are the Usual Events That Trigger Root Canal Disease?

Events that may trigger root canal disease include:

• Decay: Dental decay contains bacteria that can infect the tooth pulp. Decay can progress through the outer enamel surface of the tooth into the underlying dentin, which is a hard, yet porous, structure. Ultimately, decay can invade the dental pulp and cause pulpal injury, which leads to an inflammatory condition that can potentially become an abscess. As dental decay and its associated bacteria invade the pulpal tissue, a patient may experience no discomfort or, in other instances, the pain may be acute.
• Traumatic events: The tooth pulp is vulnerable to trauma. A blow to the mouth may lead to a variety of dental injuries. A traumatized tooth may appear whole but exhibit root canal disease at a later date. A tooth may be only slightly chipped or it may be fractured to the extent that its clinical crown is broken off and the pulpal tissue is exposed. In severe situations, the root can be fractured within the bone or the tooth completely knocked out of the mouth, which is called an "avulsion." Frequently, these traumatic events will irreversibly damage the tooth pulp by causing bacterial contamination or by interfering with the tooth's blood supply and its ability to repair. Some teeth are traumatized to the extent that they are not treatable and must be removed.
• Repetitive or extensive dental procedures: The tooth pulp is also vulnerable to injury from repetitive or extensive dental procedures. Subjecting a previously injured pulp to the additional trauma of even the best planned and performed dental surgery may be enough to cause the pulpal tissue to become irreversibly inflamed and the tooth to require root canal treatment. The dentist may or may not be able to predict this outcome in advance. At times, based on the examination and treatment plan, the dentist may recommend the removal of the dental pulp before performing other planned dental procedures. In these situations, the tooth pulp is removed so that it will not become problematic at a later date under a new, and possibly complex, restoration. At times, initiating a root canal procedure through an existing restoration may compromise its integrity.
• Periodontal disease: Infection in the gum and bone around the tooth is referred to as periodontal or gum disease. Advanced periodontal disease may compromise the blood supply to the dental pulp and ultimately, bacteria may enter and infect the pulpal tissue in the root canal space.

By Clifford J. Ruddle, DDS, in collaboration with Philip M. Smith, DDS

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The Endodontist, the General Dentist and Root Canals

All dental school graduates have basic education and training in the diagnosis and treatment of diseases of the tooth pulp and are licensed to perform a routine root canal procedure.

What Is an Endodontist?

An endodontist is a dentist who has completed an additional two to three-year course of study in an accredited endodontics postdoctoral residency program. In addition to performing routine root canal treatment and tooth pulp treatments, the endodontist has extensive training and experience in the diagnosis and treatment of a wide variety of conditions, such as:

• The differential diagnosis of painful oral and facial conditions in which the origin of the pain is uncertain. In these cases, the root canal dentist is part of a team, which may include other specialists in dentistry as well as medical colleagues, when appropriate.
• Endodontics treatment of teeth involved in cases of oral-facial trauma.
• Endodontic treatment for patients who are medically compromised.
• Endodontics treatment of complex root canal cases, such as teeth that exhibit calcified canals, curved canals, or very long roots.
• Non-surgical re-treatment of teeth that have had previous root canals.
• Surgical treatment of endodontic disease that can be treated in no other way.

There are ethical guidelines that determine what an endodontist can and cannot do. As an example, an endodontics specialist would not place crowns, dentures, or perform orthodontic procedures.

Following the completion of a root canal procedure, a patient is usually referred back to the general dentist. At times, however, in a complex situation it may be necessary for the endodontist to refer a patient to another specialist before the patient returns to their general dentist.

Why Are Patients Referred From a General Dentist to an Endodontist?

Patients are referred from a general dentist to specialist because a dental problem may be so complex that its successful diagnosis and treatment require considering a multitude of complex factors.

A "multidisciplinary" approach allows the patient to have expert opinions from different generalists and specialists so that the best of science, art, and technology can be utilized in a particular set of circumstances.

Oftentimes, an individual dentist is more interested and experienced in some areas of dentistry than in others. A general dentist may choose not to do certain procedures because:

• They do not have the equipment, instruments, or training necessary to do the procedures.
• The time involved to do the procedure well is more than they wish to spend.
• Particular teeth may exhibit complex treatment challenges.
• The patient may have medical or other complicating factors.

In short, the primary consideration for referral is that the patient has the opportunity to have the best diagnosis and the best care available. A patient may be referred from a general dentist to specialist to make certain that this goal is attained.

By Clifford J. Ruddle, DDS, in collaboration with Philip M. Smith, DDS