弹响和张口受限是颞颌关节功能紊乱的常见征候,以往观察,发现二者总不是同时出现的。弹响是由下颌张闭时,关节盘突然撞击造成;张口受限则是由于关节盘前移,限制了髁状突前移所致。本文研讨关节盘前向移位和髁状突后上移位怎样造成这些症状。交替出现的弹响和张口受限的生物机械现象,可以观察和测量出来。结合X射线髁道记录和下颌运动测量进行临床研究证明,二者交替出现是关节盘和髁状突错乱的简单变化。髁状突骤然改变其运动速度和位置,便 Snapping and mouth restriction is a common sign of temporomandibular joint dysfunction, the previous observation, found that the two are not always present at the same time. Ringing is caused by the mandibular open, the sudden impact of the articular disk caused by; mouth is limited due to the advancement of the disc, limiting the condylar protrusion due to. This article discusses how the anterior displacement of the articular disk and the posterior condylar uplift can cause these symptoms. Alternating snapping and mouth-opening biomechanical phenomena that can be observed and measured. Clinical studies with X-ray condylar recordings and mandibular movement measurements demonstrate that the alternating appearance of the two is a simple change in the disorder of the articular disk and condyle. Condyle suddenly change its speed and position, then