Longitudinal epidemiological and clinical research of TMJ disorder for Orthodontics

流行病学研究：我们研究了18-25岁人群中颞下颌关节紊乱病的患病率（日本正畸学会。'90）。这是继1988年发表的对6- 18岁人群的研究（Journal of Japan Orthodontic Society，Vol.45）之后的又一项研究。患病率为33.9%。这一比例高于年轻人（11.2%）。我们再次证实，患病率随年龄增长而增加。年龄因素对颞下颌关节紊乱病的保护作用有待进一步明确。临床研究：比较正畸治疗前后颞下颌关节紊乱病的患病率。前者的患病率（48.9%）高于后者。我们从88年开始研制下颌骨位置计算机图形系统。以30例正常人（牙合）为对照组，垂直、前位偏斜均小于1 mm，水平偏斜均小于0.3mm（TMJ学会，日本正畸学会，TDC会议，'90）。目前，我们正在推广和提出一种个体化的头颅定位片方案，是对原有方案的升级，而正畸治疗是目前许多口腔医生选择的颞下颌关节紊乱病的确定性治疗方法。我们提出了一个正畸后的病例，有颞下颌关节紊乱，但治疗后好转（颞下颌关节协会，JOS，美国正畸协会，'91）。因此，正畸治疗被认为是治疗颞下颌关节紊乱病的方法或病因。颞下颌关节紊乱病与正畸治疗的关系有待进一步研究。

Epidemiological study :We researched the prevalence of TMJ disorder on 18-25 aged people(Japan Orthodontic Society. '90). which followed the research of 6-18aged people that had published already 1988(Journal of Japan Orthodontic Society, Vol. 45). That prevalence was 33.9%. It was higher percentage than younger people(11.2%). we reconfirmed that the prevalence increased by age. The aging factor has to be more clear to protect TMJ disorder.Clinical study :We compared the prevalence of TMJ disorder of postorthodontic treatment and preorthodontic treatment people. The prevalence of the former was higher(48.9%)than that of the latter. That indicated the relationship of TMJ disorder and orthodontic treatment.We have been promoting computer graphics system of mandibular position since'88. We found the data of 30 normanl occlusion as control data, as follows : vertical and anteropostero deviation was under 1mm, horizontal deviation was under 0.3mm(TMJ Soci ety, Japan orthodontic Society, TDC meeting, '90). Now we are going to promote and present the program which is individualized cephalogram and version up of former program.Otherwise many dentists selected orthodontic treatment as definitive treatment of TMJ disorder. We presented a postorthodontic case which had had TMJ disorder but got better after treatment (TMJ Society, JOS, American Association of Orthodontics, '91). Therefore orthodontic treamtent is considered that cure methods or causes of TMJ disorder. We has to continue the research of relationship of TMJ disoreder and orthodontic treamtnet.