锁是严重影响咀嚼功能的一种后牙错畸形,其发病率约为0.3%[1]。矫治原则是升高咬合,解除锁结关系做间牵引[2]。一般矫治方法有其局限性,如需抬高咬,在上下锁牙安放带环,操作复杂,易引起创伤,并且影响咀嚼功能。我们在治疗中应用活动矫治器矫治个别后牙正锁,效果良好,现介绍如下。 Lock  is a serious impact on masticatory function of a posterior teeth malocclusion, the incidence of about 0.3% [1]. The principle of orthodontic treatment is to increase the occlusion and release the locking relationship to make inter-traction [2]. The general method of correction has its limitations, such as the need to raise the bite 在, placed in the upper and lower  locking teeth, the operation is complex, easy to cause trauma , and affect the chewing function. We apply active appliances in the treatment of individual posterior teeth correction is locked, the effect is good, are described below.