THE FOCAL INFECTION THEORY

Although there exists a great deal of controversy regarding the success of endodontic therapy, the scientific facts at the present time are that only about 10% of root canal treated teeth experience some type of failure. The controversy over endodontic treatment is not new. Beginning in about 1912, there was wide acceptance of the theory of “focal infection” which resulted in the wholesale extraction of both vital and pulp less teeth. It wasn’t until well after World War II, with the availability of improved x-rays, anesthetics, new methods and products, and the publication of the first major text book devoted to “Root Canal Therapy” that the “focal infection” theory lost favor and “saving” rather than extracting the tooth became the “standard of care.” Now however, the 1990’s has seen a resurrection of the focal infection theory.

Lets look briefly at the “Focal Infection” theory. The main purpose of the dental pulp is to supply nutrients to the dentin as long as the tooth is alive. This is done through microscopic tubules in the dentin. To give you some indication of what is meant by microscopic, each tooth contains approximately 1.5 million tubules. As the living cells necroses (rot) within the central pulp chamber of an infected tooth, this same phenomenon is happening within the tubules. In theory, root canal therapy attempts to completely obliterate and fill the main pulp chamber and canals. However, it is impossible to fill the millions of microscopic tubules. Once inside the tooth, bacteria can remain within the tubules, growing and multiplying. Because microbes can change their form and function in response to changed microenvironment within the tubules, they can go on living in spite of the altered oxygen and food supply. As they do so, they begin to produce various toxic chemicals, which have been shown to be harmful, sometimes being especially toxic to specific organs or organ systems. This phenomenon was confirmed in a recent 1987 study by Tronstad and Associates demonstrating that anaerobic bacteria 9bacteria not requiring oxygen to survive) were able to survive and maintain an infectious disease in periapical lesions of non-vital teeth. In a 1991 follow up study of endodontically treated teeth, these authors recovered microorganisms from periapical lesion of all examined teeth.

The immediate question this raises is: If there are bacteria present from every endodontically treated tooth, why doesn’t every root canal treated tooth become abscessed and fail? An oversimplification of the answer is that your own body’s immune system is able to contain and neutralize the bacteria.
Dr. Weston Price, during the early 1990’s, devoted most of his brilliant career to investigation of the focal infection theory. his research, involving thousands of patients and rabbits, formed the basis for the over 220 articles and 3 major books which he authored. In essence, the focus infection theory research by Dr. Price holds that it is not the bacterial that causes systemic problems, but rather the toxic chemicals produced from the necrosis and decay within the tubules, whether the tooth had been endodontically treated or not. As a consequence of the fact that there was no way to completely seal the apex (tip of the root) and the tubules, the need to extract both vital and pulp less teeth, when an infection was evident, became the effective treatment.

There are now a group of dentist around the country who are openly advocating the extraction of every root canalled tooth on the basis of the research done by Dr. Price. This is certainly a radical approach to solving a problem that appears to be limited to only about 10% of the total number of root canal treatments done. Furthermore, it certainly does not take into consideration the use of calcium oxide as a root canal medication in the treatment of infected root canals. much of the current confusion in the minds of the public about the efficacy of root canal therapy has been precipitated by the book “root Canal Cover Up” written by George Meinig, D.D.S., past president of the American Association of Endodontists. Dr. Meinig extensively cites the work of Dr. Price and concludes that there is a serious problem with root canal therapy and teeth that have had root canal treatment. This, of course, is a major break with his own previous training and the policies of both the American Association of Endodontists, and the American Dental Association. Patients going to an “establishment” endodontist or dentist who does not subscribe to the focal infection theory are given a much different picture on the efficacy of root canal treatment rely heavily in the use of some very toxic chemicals and cements. And although there is a 90% success rate for most endodontic procedures, it is still a scientific fact that using the existing endodonitic materials and techniques, there is no way to totally deal the apex of the tooth and the dentinal tubules.

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