The bacterial child of dead marrow tooth can pass a pointed aperture or side rootlet canal causes a pointed week pathological change or root bifurcate pathological change .

死髓牙的细菌产物可通过根尖孔或侧支根管引起根尖周病变或根分叉病变。

Conclusion : the method is simple , rapid , and accurate . The content of polysaccharide in rootlet is lowest , and monosaccharide compositions in rootlet are significantly different from parent root and daughter root .

结论:多糖含量检测方法简便、快速,测定结果更客观、准确;须根中多糖含量最低,且单糖组成与母根、子根有明显不同。