Dentistry is said in the end to be occlusion, which is based upon centric relation. As is often the case, more than 90% of adults have some occlusal problems.
Centric prematurity and occlusal interferences will result in occlusal disorders when the adaptability of the living body deteriorates because of various stresses. It is easily supposed that the mortalityrate will get higher and higher in such stressful and technologically developed times as today.
Since January of 1975, we obtained 705 cases of symptoms of occlusal disorders as main complaints. There were many who turned out to have been suffering from occlusal disorders after occlusal analysis in centric relation had been done by dentists. Even though these patients had no initial complaints a closer inspection revealed a number of occlusal disorders.
Examining with a study cast mounted on an articulator in centric relation, we can find prematurity and occlusal interference thus revealing occlusal disorders. As a result, the patient learns that usage of an articulator makes it possible for certain restorations. This draws from the patient reliability in the dentist and recognition of the value of the restoration.
It is feared that restorations made in intercuspal occlusal position might be adjusted to the cavity of occlusal dispositions. In case the previously mounted restoration has an occlusal disorder, even the newly made restoration, so far as it is copied from the previous one, might also cause further occlusal disorders.
In order to obtain real trust from the patients, every restoration must be prepared in centric relation. Through the initial diagnosis and the subsequent treatment, we should explain to the patients the necessity of physiologically appropriate occlusion.
Occlusal diagnosis and treatment is the very best starting point for every dentist.

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I.P.B, value was introduced as the new concept of non-working horizontal condylar path. The advantages of applying I.P.B. value for adjusting the semi-adjustable articulator can be summarized as follows:
1. Real orbit of non-working horizontal condylar path can be reproduced by I.P.B. value. Therefore, the non-working horizontal condylar path of the articulator adjusted by the I.P.B. value is more precise than that reproduced by the Bennett angle or by the immediate sideshift.
2. I.P.B. value indicates the relationships among the Bennett angle, the amount of immediate sideshift, and the angle of progressive sideshift. When the Bennett angle is measured on the articulator by means of the checkbite procedure, the amount of immediate sideshift and the angle of progressive sideshift can be obtained from the I.P.B. value table. Thus, nonworiking horizontal codylar path of the articulator can be adjusted with both immediate sideshift and progressive sideshift simultaneously.
3. The procedure for adjusting non-working horizontal condylar path by I.P.B. value on the semi adjustable articulator consists of three steps including 1) lateral check bite registration, 2) measuring the Bennett angle, and 3) articulator adjustment. This procedure is simple and provides better accuracy of reproducing the condylar path, in comparison with the traditional check bite procedure.

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As dentists we have mainly devoted ourselves to observing only the oral cavity. However, it should be kept in mind that the oral cavity is only part of the body. Considering the function of one's whole body, the oral cavity is not only a masticatory organ but also an important factor in the maintenance of posture. It should also be remembered that the oral cavity has a close relationship to one's neck muscles which directly effect the circulatory system. When blood carrying its full measure of oxygen and nutrition flows without any interference and the nervous system is not under any pressure, the body's healing power will be enhanced enabling a person to live a healthier and more productive life.
Studying fig.5, we recognize that occlusal disorders and diseases are closely related. Diseases are not contracted unless one of the four elements such as physical construction, personality, living environment and age of a patient is somehow deficient.
Every opinion on occlusion has its own virtue and brings a certain efficiency to practical treatment. In this sense the principles of gnathology play an important role in clinical diagnosis and treatment.
Its success rate is only about 80 percent. It is essential to consider the patient's posture and accompanying symptoms in order to obtain a full rate of success in treatment. If this is successfully done, I predict that it may not be long before dentistry surpasses general medicine. When the occlusion cured by a dentist makes it possible for a patient to control his posture, the elimination of the causes of many diseases may be handled by the dentist only.
As dentists we may be able to make a contribution in a greater sphere of health care, and I would like to propose that this should be regarded as a third medical science.

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