ABSTRACTThe purpose of this study was to evaluate the mandibular movements of TMD patients
comparing to normal persons. Sirognathograph was used to measure five parameters of
mandibular movements of twenty normal persons and eight TMDpatients. Five parameters were
(1) Maximum opening during maximum opening and closing, (2) Mean velocity during maximum
opening and closing, (3) Maximum opening during unilateral chewing, (4) Mean velocity during
unilateral chewing, (5) Consistency of mandibular movement during unilateral chewing.Based on above results, new Mandibular Movement Index(M.M.L) was formulated and
compared to Helkimo's Clinical Dysfunction Index by measuring two indices before treatment and
2 weeks, 4 weeks, 6 weeks, 8 weeks after treatment.The conclusions were as follows:1. The amounts of maximum opening and mean velocity during maximum opening and closing of
TMD patients were less than those of normal persons (p<0.01).
2. The amounts of maximum opening and mean velocity during unilateral chewing of TMD
patients were less than those of normal persons (p<0.05) (p<0.01).
3. Although TMD patients showed limited mandibular movements during unilateral chewing, the
consistency of mandibular movements was better than that of normal persons (p<0.05).
4. Both mandibular movement index and Helkimo's Clinical Dysfunction Index, were useful in
diagnosing TMD patients.
The purpose of this study was to evaluate the mandibular movements of TMD patients comparing to normal persons. Sirognathograph was used to measure five parameters of mandibular movements of twenty normal persons and eight TMDpatients. Five parameters were (1) Maximum opening during maximum opening and closing, (2) Mean velocity during maximum opening and closing, (3) Maximum opening during unilateral chewing, (4) Mean velocity during unilateral chewing, (5) Consistency of mandibular movement during unilateral chewing.
Based on above results, new Mandibular Movement Index(M.M.L) was formulated and compared to Helkimo´s Clinical Dysfunction Index by measuring two indices before treatment and 2 weeks, 4 weeks, 6 weeks, 8 weeks after treatment.
The conclusions were as follows:
1. The amounts of maximum opening and mean velocity during maximum opening and closing of TMD patients were less than those of normal persons (p<0.01).
2. The amounts of maximum opening and mean velocity during unilateral chewing of TMD patients were less than those of normal persons (p<0.05) (p<0.01).
3. Although TMD patients showed limited mandibular movements during unilateral chewing, the consistency of mandibular movements was better than that of normal persons (p<0.05).
4. Both mandibular movement index and Helkimo´s Clinical Dysfunction Index, were useful in diagnosing TMD patients.
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