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下颌第三磨牙在下颌升支内开始发育时,它的(牙合)面与下颌平面呈一定的角度(以下均称下第三磨牙角度)。下第三磨牙萌出后要获得正常的(牙合)关系,必须经历一个直立的运动,而这种运动或多或少地取决于下第三磨牙的原始角度。本研究的目的是要确定该牙角度何时变化和如何变化。作者研究了第三磨牙发育的纵向记录材料,选择了有显著角度变化或根本无变化的三组第三磨牙。第一组包括11个直立的第三磨牙,其开始萌出的角度是45°或更大些。第二组有8个第
When the mandibular third molars begin to develop in the mandibular ascending branch, its (occlusal) plane is at an angle to the mandibular plane (hereinafter referred to as the third molars angle). The next occlusion of the third molar to obtain a normal occlusion must go through an upright movement that depends more or less on the original angle of the third molar. The purpose of this study is to determine when the angle of the tooth changes and how it changes. The authors studied longitudinal recording material for the development of the third molars and selected three groups of third molars with significant or no change. The first group consisted of 11 erect third molars, which started erupting at an angle of 45 ° or more. The second group has 8 first