The author performed on epidemiologic study of the TMD in 189 elderly people and 195 young people with Helkimo index.
The Clinical dysfunction index was based on data from clinical examination and the anamnestic dysfunction index was based on data from the interview with the investigated person. The results were as follows
1. In the elderly population, 27.5% reported that they had subjective symptom of TMD but 43.4% had sign and symptoms of TMD in clinical examination.
2. The mean values for maximal opening differed significantly between elderly and young populations, 47.22em and 5h44.o(p<0.001) and less than a 40mm opening was observed 7.9% in elderly population, 0.5% in young population(p<0.001).
3. The mean- values for lateral movement to the right and left did not differ with age, which were 8.56w and 8.47.e in elderly population, 8.90.a and- 8.81.= in young population but the mean values for protrusion differed signf cantly between elderly and young populations, 6.89m and 7.64s(p<0.01).
4. A higher incidence of TMJ noise was recorded in the elderly population than young population, especially crepitus, but a higher incidence of clicking was recorded in young population (p<0.05).
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