Clinico-statistical observation of 87 patients with TMJ and muscle dysfunction whovisited the Ist Department of Prosthetic Dentistry, Univ. Hospital attached to the Facultyof Dentistry Kyushu University during 10 years and a half from April 1977 untill September 1987was studied.
The results were as follows;
1. The number of patients suffering from this disease tends to increase every year, and inlast 5 years this increment was remarkable.
2. Female was 4.8 times more than male. The patients in fifties (26.4%) was most of alland the next was in thirties (21.9%). Then the distribution showed double-curve.
3. On suffered side, left side was a little more than right side, but there was no significantdifference.
4. The incitation was prosthetic treatment in 40.2% of all and in 35.6% was unknown.
5. Initial symptoms and the chief complaint, the single symptoms was more than many onesand the pain of TMJ was the most usual symptoms.
6. In present symptoms, the pain was recognized in 60.9%, the noise in 59.8% and thedifficulty of opening the mouth in 33.3%.
