The morphology of two types of the central bearing plates, namely the Stuart and the Denar, were examined by means of the three-dimensional measuring system. The equal altitude graphs and the section diagrams for the protrusive and the lateral pathways were evaluated. The following conclusions can be drawn.
1. The bearing plate of the Stuart clutch possesses the flat surface in the initial 1.5 mm, and the 16.9 mm and the 18.8 mm radius concave curvatures for protrusive and lateral pathways respectively in the following 7 mm.
2. The bearing plate of the Denar clutch possesses the flat surface in the initial 0.4 to 0.7 mm, the 20 mm radii concave curvature for both protrusive and lateral pathways in the following 1 mm, and the inclined flat surface in the final 6 to 7 mm.
3. According to the equal altitude diagrams, Denar's bearing plate shows more concavity and steeper inclination than Stuart's one does. However, the difference was not so great that less influence was expected for the mandible to rotate along the terminal hinge axis during translatory movement.
4. The inclination of the bearing plate is not steep enough to represent the sagittal incisal path. However, the flat bearing plate is effective to avoid the occlusal contacts and undue neuromuscular interference.
5. When wearing the clutches, the mandible rotates toward closing direction and trans lates forward and downward during eccentric movement. Because the clutch enhances the condyles to direct upward against the articular eminence, it is mandatory to record the reproducible border movement.

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In this example, in conducting reconstruction it is conjectured that there is a big difference, as far as treatment is concerned, between extracting the upper canine and preserving it.
Upon first considering the predominance of the canine in the occlusion, it was diagnosed that the canine stump could be preserved by orthodontic treatment and periodontal surgery. Finally, it was given the occlusional pattern of a mutually protected occlusion. In being preserved, the function that the canine naturally had was able to be revised. It is my conclusion that this resulted in a satisfactory occlusion.

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Multidisciplinary approach and treatment is essential when the partially edentulous mouth is restored. It is not enough to treat the edentulous regions, but is necessary to concern general and psychological etiologuies so that successful treatment is accomplished. It should not be overlooked that mental stress accumulation and the following oral disharmony have been caused unconciously during the collapse process of the mouth.
Temporomandibular joint and muscle dysfunctions develop gradually in most cases, and the patients'corplain chronic symptoms. Some patient do not even realize the existarce of the symptoms of temporomandibular dysfunctions until severe pain or evident mandibular function appears. The early inspection and diagnosis are appreciated so that preventive means and treatment are performed.
The treatment of the mutilated mouth condition has to be made on the basis of the stable normal mandibuar position. Furthermore, the prosthesis has to maintain oral health and harmonize with periodontium, muscles, temporomandibular joints, soft tissue and other oral tissues. In this article, the author discribed the procedures for oral (occlusal) reconstruction applied for the partially edentulous mouth. The patient had lost the original vertical dimension and the dentitions showed abnormal occlusal relations. The position of the mandible was unstable. The treatment was successfully accomplished and the mandibular position is now stable. The diagnosis, treatment planning and the treatment procedures were discussed and suggested by the members of Sendai Rinsho Shigaku Kenshukai.

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Now it can be possible to get the occlusal function again by the introduction of dental implants to the clinical dentistry. This owes greatly to the development and the perpetual study of the designs of the new materials such as Co-Cr-Mo, Titan, Celamics and Apatite as biomatelials that are very good in the point of the vital affinity. Gnathology is the clinical dentistry for the dentulous jaws. Therefore if it is applied together with dental implants, patients will get great satisfaction. I have had many clinical cases of the rehabilitation using dental implants to the edentulous regions. This time I will report them.

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In order to perform correct sequence for oral rehabilitation, it is essential to realize not only the etiology of the collapsed occlusion, but the systematic clinical procedure, as well. In this article the etiologies were classified into four types and describ those characteristics. By these classifications, it is now possible to conduct systematic clinical procedures with multidisciplinary approaches including orthodontic, endodontic, periodontic, and prosthodontic treatments.
Type 1 features severe attrition with TMJ symptoms. Type 2 features multilated dentition without vertical loss. Type 3 is the most difficult case with anterior prognathism and vertical loss. Type 4 concerns with open bite. The part 1 refers the treatment procedures for type 1 and type 2. Type 3 and Type 4 are explained in the part 2.

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