A Study on the Prevention of TMJ Dysfunction Syndrome in Adolescent

1. 青少年颞下颌关节的声音和正常咬合儿童的下颌运动。Okazaki认为有TMJ音的患者有潜在的TMJ功能障碍，因此认为TMJ音是TMJ功能障碍综合征预防保健的重要标志。Hirai报告的目的是确定儿童下颌运动随发育的变化。研究对象为33例正常闭塞儿童。结果表明：随着Hellman牙期（IIA、IIIA、IVA）的进展，下颌向外、前、下、后四个方向的运动范围扩大，最大开口位、最大凸位和最大侧位的偏差减小。青少年颞下颌关节形态及颞下颌关节功能障碍综合征征象的研究。我们尝试用FCR对矢状面和额状面进行三维评价。从研究中得出以下结论：在髁突与窝的位置上，矢状位与额位高度相关。颞下颌关节功能障碍综合征的治疗研究。通过对颞下颌关节功能障碍患者进行正畸治疗活动前后咬合状况的变化和咀嚼肌功能的变化，探讨了在夹板治疗后积极正畸治疗进展的有效性和存在的问题。1)所有患者均通过正畸治疗改善了磨牙合。2)正畸治疗后咀嚼肌功能通过评估咀嚼肌活动和沉默期状态，较初诊时有所改善。目前，我们正在研究复位夹板治疗颞下颌关节功能障碍的方法。

1. TMJ sounds in adolescents and the mandibular movement in children with normal occlusion.Okazaki was suggested that the ones with TMJ sounds had the TMJ dysfunction latently, therefore it was cosidered important sign of TMJ sounds for the preventive care of the TMJ dysfunction syndrome. The purpose of Hirai's report was to ascertain the changing of the mandibular movement according to the development in children. The subjects consisted of 33 children with normal occlusion. The results obtained were as follows : Based on the progress of Hellman's dental stage (IIA, IIIA, IVA), the range of mandibular movement was enlarge towards the exterior, anterior, inferior and posterior while the deviations of the maximal opening position, maximal protruded occlusal position and maximal lateral occlusal positions decreased.2. A study on the morphology of TMJ and signs of TMJ dysfunction syndrome in adolescent.We made on attempted the evaluation of the figure in three dimensions using sagital and frontal section by FCR. The following conclusions were derived from the study : On thecondyle position to fossa high correlations were found between sagital and frontal section.3. A study on Therapy in TMJ dysfunction syndrome.The efficiency and problems concerning the progress of active orthodontic therapy after splint therapy were examinated from the data of the change of occlusal conditions, and the function of masticatory muscles before and after therapy for TMJ dysfunction patients which we performed orthodontic therapy activity. 1) Molocclusion was improved with orthodontic therapy in all patients. 2) The function of the masticatory muscles after orthodontic therapy was improved in comparison with the first visit by evaluation of the masticatory muscles activity and the state of silent period. At present, we are investigating the therapy of repositioning splint for TMJ dysfunction patient.