儿童时期不仅身体各部分处于生长发育过程 ,也是牙齿生长发育的主要阶段 ,儿童牙病越来越引起专业人士关注。本科近几年对于乳磨牙 ,进行甲醛甲酚活髓切断术 ,其特点为一次性治疗 ,均取得了较满意的效果。1　病例选择第一乳磨牙 2～ 7岁牙根 ,第二乳磨牙 3～ 8岁牙根 ,牙根处于 In childhood, not only the various parts of the body are in the process of growth and development, but also the main stage of the growth and development of the teeth. Children's dental diseases have drawn more and more attention from professionals. In recent years, undergraduate for deciduous teeth, formaldehyde cresol live pulp transection, which is characterized by a one-time treatment, have achieved more satisfactory results. 1 cases of first molar deciduous teeth 2 to 7 years old, second deciduous teeth 3 to 8 years old roots, roots in