1992 Volume 36 Issue 2 Pages 367-380
Occlusal diagnosis should be included not only static but also dynamic informations from a patient during function in stomatognathic system. Chewing movements were evaluated on the pathway in areas of intercuspal position utilizing the Sirognathograph Analyzing System II to establish a clinical assessment. Functional directions were objectively studied during opening-closing movements through a newly developed soft ware program which made possible to analyze them in three dimensional planes. Twenty dentate subjects were selected at random from students and staff of Kanagawa Dental College who had no history of stomatognathic dysfunction. Classification of grinding patterns were performed in mastication of a piece of chewing gum for all subjects to obtain an objective assessment of functional directions in chewing movements.
As a result, a newly developed analyzing program contribute to classify the grinding patterns in chewing movements. Application of regression line made also possible to evaluate linear directions. A study of a total 1, 200 chewing cycles and grinding patterns in both sides of all subjects showed that B-W, W-W, N-W patterns were more frequently occured. Average path angles and their standard deviations in chewing movements contribute to a clinical assessment for functional diagnosis.
