临床上由于诸多因素易导致极管扩大针(根管锉)断裂,造成一定的浪费。我科利用断裂的扩大针(根管锉)经磨改后用于修复双尖牙残根取得满意效果,现报道如下。1 材料选用金属柄的根管扩大针(根管锉)。光固化复合树脂材料。2 治疗结果共修复31例,其中上 Clinically due to many factors lead to the expansion of the needle tube (root canal file) fracture, resulting in some waste. I use the expansion of the fracture needle (root canal file) after the modification used to repair the canine root to obtain satisfactory results are reported below. 1 material selection of metal handle root canal expansion needle (root canal file). Light curing composite resin material. 2 treatment results were repaired in 31 cases, of which the upper