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通常在1%的人当中发现有额外牙,而其中萌出的只占1/3。额外牙在上切牙部位萌出较为多见。上中切牙之间的额外牙,可使一侧或两侧的中切牙向远中移位,造成上切牙拥挤畸形。矫治原则:拔除萌出的或阻生的额外牙;假如在拔除额外牙后拥挤畸形不能自行调整时,可使用矫治器进行矫治。矫治方法:我们选用半固定矫治器,从临床矫治效果说明它具有活动矫治器和固定矫治器两者的优
Usually 1% of the people found in extra teeth, of which only one-third of the eruption. Extra teeth in the upper incisors eruption more common. The extra teeth between the upper and lower incisors can shift the incisor on one or both sides to the far center, resulting in a crowded deformity of the incisors. Correction principle: removal of eruption or impaction of extra teeth; if extra crowding in the removal of crowded deformity can not be adjusted, the appliance can be used for orthodontic treatment. Correction method: We use a semi-fixed appliance, from the clinical results show that it has the activity of appliances and fixed appliance both excellent