Objective: To investigate the influence of different molar extraction time on apical root resorption during orthodontic space closure treatment and to see if the longer the extraction time of first molar the more serious root resorption of second molar will occur during orthodontic space closure treatment. 目的:对比研究正畸关闭陈旧性和非陈旧性磨牙间隙病例的牙根吸收情况,探讨关闭不同缺失时间的下颌第一磨牙缺隙对第二磨牙牙根吸收的影响。
TJs, the most apical component of the junction complex, separate the apical from the lateral plasma membrane through forming a continuous belt-like attachment at the outer end of the intercellular space between cells. 紧密连接是连接复合物中最靠近顶点的成分,通过在细胞间形成连续的带状结构隔离了顶点和侧质膜。