A investigation or temporomandibular joint dysfunction syndrome in adolescents

本研究选取的两个地区是位于亚寒带的北海道东部（北上市和蒙别市）和位于亚热带的冲绳县（宫古岛平原市）。为了开展TMJ功能障碍综合征的流行病学调查，根据临床症状对北海道地区（男生1699人，女生1486人）和冲绳地区（男生1430人，女生1478人）的6093名初高中学生进行临床检查。研究时间为2000年6月至2001年5月，约一年。这些调查对象（12 ~ 18岁）中颞下颌关节功能障碍综合征征象的患病率主要集中在北海道（初中生：7.0%，高中生：11.4%）和冲绳（初中生：6.4%，高中生：12.2%）。对北海道和冲绳地区具有相似倾向的颞颌关节功能障碍患者的患病率进行了调查。与此同时，我们还研究了更多的心理因素使用STAI （C.D.Spielberger）一个受试者出现TMJ功能障碍综合征三种主要症状中的任何一种都被认为是TMJ功能障碍综合征患者。因此，在总共481人身上观察到这些迹象中的一个或多个。对照组为正常闭塞（无体征）学生54例。焦虑综合征和焦虑神经症的发生率较高，疼痛组与焦虑神经症组比较差异有统计学意义，有意识组TMJ功能障碍综合征的发生率高于无意识组。有意识的女生组表现出与男生组相似的倾向。建立下颌骨包括颞下颌关节的三维有限元模型，探讨功能状态和解剖形态变化对颞下颌关节载荷的影响。结果表明，咬合支持度和水平髁角的变化对颞下颌关节负荷有影响。少

The two districts selected for this study WOKS east Hokkaido (Kitami and Monbetsu cities) at subfrigid zone and Okinawa (hirara City of Miyako island) at subtropical zone. In order to conduct as epidemiological investigation of the TMJ dysfunction syndrome, 6093 subjects of junior high schools and senior high schools in Hokkaido (1699 boys and 1486 girls) and Okinawa (1430 boys and 1478 girls) were examined clinically according to the clinical signs. The period of the study was about one year from June 2000 to May 2001. The prevalence of signs of the TMJ dysfunction syndrome on these subjects (12〜18 years) was in Hokkaido (junior high school students : 7.0 %, senior high school students : 11.4 %) and Okinawa (junior high school students : 6.4 %, senior high school students : 12.2 %). The prevalence in the TMJ dysfunction syndrome in these subjects in Hokkaido and Okinawa of similar tendency was determined inspective of the region. At the same time we were to investigate the relationshi … More p psychological factor using STAI (C.D.Spielberger) A subject suffering from any one of three major signs of TMJ dysfunction syndrome was considered a sufferer of TMJ dysfunction syndrome. Thus, one or more of these signs were observed on a total of 481 persons. The control group was 54 students with normal occlussion (no signs). The anxiety syndrome and anxiety neurosis of STAI was found high with significant difference on those values in pain group as compare with those values and anxiety neurosis of STAI, the conscious girls group of signs of TMJ dysfunction syndrome had a greater prevalence than the unconscious group. The conscious girls group showed similar tendency than boys group.Furthermore, A three-dimentional finite-element model of mandible, including the TMJ, was constructed in order to examine the influences of changes in the functional situation and anatomical morphology on TMJ loading. It was seen that changes in the occlusal - supporting are and horizontal condylar angle influence TMJ loading. Less