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上前牙重度扭转错位（大于９０度），以往采用活动或固定矫正器进行矫治。矫治中易出现牙齿松动，牙髓坏死等不良后果。近几年来ＴｉＮｉ丝矫正器在临床上已广泛应用，临床实践表明对上前牙重度扭转错位的矫正效果良好。与以往常用的不锈钢丝比较，ＴｉＮｉ丝回弹性好，弹...
The anterior teeth severe torsion dislocation (greater than 90 degrees), the past activities or fixed orthodontic appliance. Correction prone to tooth looseness, pulp necrosis and other adverse consequences. In recent years, TiNi wire braces have been widely used in clinical practice, clinical practice shows that the correction of severe torsion dislocation of the anterior teeth is good. Compared with the stainless steel wire used in the past, the TiNi wire has good resilience and elasticity.