Ⅰ、下颌运动如果开口和闭口纯属下颌的旋转运动,合是一个很容易理解和解决的问题。但情况不是这样,下颌可能向三个平面:垂直面、额面和水平面旋转或移动。其运动可能偏向这些平面中的某一平面或多平面,产生的潜力使运动错综复杂地相互影响。这就部分地阐明了合的有争论的历史和学说。颞下颌关节的复杂性和重要性及其在下颌运动中的作用使人无法理解。 Ⅰ, jaw movement If the opening and closing is purely mandibular rotation, is a very easy to understand and solve the problem. But this is not the case, the lower jaw may rotate or move to three planes: vertical, frontal and horizontal. Their movements may be biased towards one or more of these planes, with the potential for movement to interact with each other intricately. This partly explains the controversial history and doctrine. The complexity and importance of the temporomandibular joint and its role in mandibular movement make it unintelligible.