少年恒前牙反合形成的期间，正是后面乳磨牙开始吸收、更替的时期，此时乳磨牙多半龋坏严重、而六龄齿冠萌出也较短，进行矫治无论是活动矫治器还是固定矫治器，均存在着难以附着、固定和难以形成稳固支抗的情形，因而难以有效的应用．为此，在临床实践中本组人员根据斜面导极 Juveniles during the formation of constant anterior teeth, it is the beginning of the back of the molars began to absorb, the period of replacement, when most of the deciduous molars serious caries, and six-year-old tooth crown eruption is also shorter, both orthodontic appliance correction or immobilization Appliance, there are difficult to attach, fixed and difficult to form a solid support for the case, it is difficult to effectively apply. To this end, in clinical practice in this group of personnel based on the slope of the pole