外伤性单根牙颈下1/3根折的保存治疗,主要对象指的是(?)前牙,由于这些牙齿位于口腔前区最突出部位,容易遭受暴力打击而致外伤。除常见外伤性牙周挫伤、牙体脱位及折断也是最常见的损伤。临床对外伤性前牙体折断的治疗,已取得了可喜进展,特别是对外伤 Traumatic single root canal under the 1/3 root folder preservation treatment, the main target refers to (?) Anterior teeth, due to these teeth in the most prominent parts of the oral front, vulnerable to violence caused by trauma and trauma. In addition to common traumatic periodontal contusion, tooth dislocation and fracture is the most common injury. Clinical treatment of traumatic anterior tooth fracture, has made encouraging progress, especially for trauma