チューイン法による関節窩形態の変化に関する研究 : セントラルベアリングプレートの形態による影響

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Although there is a fair large literature on the reproducibility of jaw movement by a semi-adjustable articulator, researches dealing with a fully adjustable articulator are yet relatively few. In the present study, the author eas concerned with the chew-in method by use of the TMJ articular with special attention on the following three points. i) Changes in the form corresponding to the mandibular condyle or resin fossa when the form of central bearing plate was made into either one of flat, convex and concave planes. ii) The degree of reproducibility of the TMJ articulator. iii) Possible effect on a range of 2mm from the centric relation from a standpoint of functional movement. By way of study material, 3 male students in their twenties at Nihon University School of Dentistry, who were in possession of normal arch and periodontal structure free from any defective tooth or teeth? were selectively used. Exchangeable central bearing plates of flat, convex and concave (the last two being 2 inches in radius) forms were constructed on the mandibular resin clutch, where chew-ins were made in the subjects by keeping vertical occlusal dimension at the centric relation uniform or constant. By repeating the procedure for three times to produce 9 chew-ins per individual subject, a total of 27 resin fossas were prepared. Subsequently, these resin fossas were subjected to a series of three-dimensional measurements (on the left side only) for comparative analyses. As a result of the study, the author arrived at the following conclusions : 1. Changes in the form of each central bearing plate did not influence the form of resin fossas. 2. When the form of TMJ articulator resin fossa was regarded as being functional in a range 2mm away from the centric relation, there was no appreciable influence on the part of central bearing plate. 3. The form of resin fossa between respective central bearing plates was approximately 4μ at the centric relation and, within a range of 2mm from it, the mean value was 50μ. As the value was less than 200μ in terms of the clinical requirements, the reproducibility of the TMJ articulator could'be confirmed to be quite adequate. 4. With any form of the central bearing plates, a scatter of resin fossa forms was smaller outside the centric relation (corresponding to the working side) than inside of it (corresponding to the balancing side). In other words, with the TMJ articular its degree of reproducibility was inferior on the balancing side rather than on the working side. 5. When condylar distance of the TMJ articulator was fixed at the innermost position, the resin fossas of individual subjects were collected in more or less similar forms. This suggests a possibility that, by increasing the number of cases, it wll be possible to construct a semiadjustable articulator that has the average condylar fossa morphology. 6. From the fact that changes in the form of central bearing plates would not affect the form of glenoid fossa, it could be established that the TMJ articulator has an excellent degree of reproducibility. On the strength of the above findings, it is to be concluded that the TMJ articulator is one which serves clinical purposes satisfactorily.
日本補綴歯科学会の論文
1979-05-31

著者

林清佐
日本大学大学院歯学研究科歯科補綴学専攻

チューイン法による関節窩形態の変化に関する研究 : セントラルベアリングプレートの形態による影響

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