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Recent interest in promoting the economic development of the so-called "underdeveloped" areas has stimulated concern with the problem of the effects of social anil cultural institutions on economic growth. A major difficulty in the study of this problem is the scarcity of cases of marked economic development in non-Western cultural milieus, Japan being the major striking exception. Under these circumstances it may be of some interest to examine cases of less striking change on a smaller scale, not only for what can be learned about each case, but also for the assistance they may give in interpreting the more numerous cases of little or no economic growth.

AbstractTrismus can be the symptom of several diseases. For the most part, the inability to open the mouth is due to an articular disorder but occasionally, the cause may be extra‐articular. In this case, being reported, non‐articular hysterical trismus caused the jaw to lock in an 11‐year‐old boy for 3 months. During this period the jaw was completely locked and the locking was associated with moderate to severe pain. After three sessions of therapy the patient was able to open his mouth 33 mm and his eating was back to normal. Conversion disorders often present with dramatic physical presentation including trismus and jaw lock. This report highlights the importance of complete history taking and a thorough clinical examination to make a correct diagnosis in a patient with trismus.