若年者顎関節症の病態についての検討

概要

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The etiology was investigated on 141 patients with temporomandibular dysfunction under 19 years old who visited our clinic for 3 years from January 1987 to December 1989 in order to investigate the etiology.The results were as follows: 1.The patients less than 20 years old occupied 21.3% of the total patients. 2.The incidence remarkably increased on the patients over 15 who amounted to 76.6% of the subjects. 3.Type III accompanied with the displaced disc was seen most frequently (86.6%) in the classification of the TMJ dysfunction and this percentage was greater than that of all type III patients in our clinic.Furthermore, all patients, of 33 the cases, under 15 years old were type III. 4.The frequency of the intermittent closed lock was dominant in comparison to that seen in the total patients of or clinic. 5.There was the tendency that younger patients with the displaced disc, especially with intermittent closed lock didn't have pain in the TMJ or masticatory muscles. 6.Remarkable bone changes in the condylar head were observed in 4 cases.