Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Longitudinal course of temporomandibular joint sounds in Japanese children and adolescents | Torii Head Face Medicine 2011 7 17 http content 7 1 17 HEAD FACE MEDICINE RESEARCH Open Access Longitudinal course of temporomandibular joint sounds in Japanese children and adolescents Kengo Torii Abstract Background Many epidemiological studies of temporomandibular disorders TMDs in children and adolescents have been performed. However the results of such studies have varied and a comprehensive view of the prevalence and severity of symptoms and signs is difficult to obtain. In the present study temporomandibular joint TMJ sounds which are the most common signs and symptoms of TMD were observed longitudinally and the need for treatment was evaluated. Methods Seventy individuals in six age groups 5 6 7 8 9 and 10 years old at the beginning of the observation period participated in an epidemiological investigation conducted between 1987 and 1992. During each clinical examination the following parameters were examined maximum unassisted jaw opening TMJ clicking and the coincidence or difference between the midlines of the upper central incisors and the lower central incisors. In addition the bilateral bite force was recorded and the numbers of erupted decayed and filled teeth were recorded. Results Eight individuals dropped out because they moved. No TMJ dysfunction requiring treatment was observed in this series. TMJ clicking was observed in 30 subjects 48 however this symptom was temporary in most of subjects 26 subjects 42 and only 3 subjects 5 had persistent clicking continuing until the end of the observation period . The incidences of clicking were not significantly different among the six groups x2 . Clicking was significantly more common among girls 19 subjects than among boys 11 subjects P . A significantly lower bite force 17 18 kg was recorded for the subjects with persistent clicking compared with that of the other subjects 8- and 9-year-olds mixed dentition without persistent clicking 32 17 kg . The persistent clicking
